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mechanical ventilation &#40;MV&#41;&#44; and particularly invasive mechanical ventilation &#40;IMV&#41;&#44; has been shown to be one of the risk factors of mortality in the ICU&#46;<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1&#44;2</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The development of noninvasive positive pressure ventilation &#40;NPPV&#41; as a ventilatory support technique has represented a great step forward in the ventilatory care of critically ill patients&#46; NPPV offers a series of benefits&#44;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#44;10</span></a> since it lessens the need for orotracheal intubation thanks to resting of the muscle burden generated by the respiratory disease underlying ARF&#59; improves oxygenation&#59; and facilitates the elimination of carbon dioxide&#46; As a direct consequence of this&#44; NPPV is able to reduce the incidence of ventilator associated pneumonia &#40;VAP&#41; and shorten patient stay in the ICU and in hospital&#44; especially in immune depressed individuals&#46; Nevertheless&#44; despite these reported benefits and the existence of studies supporting the success of the technique&#44;<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;10&#8211;13</span></a> NPPV is still less widely used than expected&#44; and IMV remains the gold standard for the ventilation support of these patients&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">The present study analyzes the incidence of ARF in hematological patients admitted to the ICU and requiring mechanical ventilation &#40;invasive and noninvasive&#41;&#44; with the purpose of determining whether NPPV is superior to IMV in terms of the development of infections&#44; organ failure&#44; the duration of mechanical ventilation&#44; the duration of stay in the ICU and in hospital&#44; 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For the microbiological study we determined soluble antigens in urine&#44; and peripheral blood samples were obtained for blood culture and pneumonia serological testing&#46; Lastly&#44; where possible&#44; we obtained sputum for culture and gram staining&#46; Nasopharyngeal aspiration in turn was performed for determination of the new H1N1 influenza virus &#8211; this test being carried out on a routine basis since 2009 in all cases of pneumonia exhibiting an interstitial radiological pattern&#46; Non-bronchoscopic invasive samples &#40;bronchoalveolar lavage and bronchial aspirate&#41;&#44; were collected once the patients were intubated&#46; The criteria for sepsis and septic shock were established according to the literature&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a></p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Monitorization and study variables</span><p id="par0030" class="elsevierStylePara elsevierViewall">Upon patient admission&#44; invasive hemodynamic monitorization was carried out&#44; with arterial catheterization and a central venous line&#46; Respiratory monitorization in turn was carried out by recording transcutaneous oxygen saturation &#40;SatcO<span class="elsevierStyleInf">2</span>&#41; with an Oxisensor Nellcor <span class="elsevierStyleSmallCaps">II</span> D-25 pulsioxymeter &#40;Nellcor<span class="elsevierStyleSup">&#174;</span> Puritan Bennet Inc&#46;&#44; Decasanton&#44; CA&#44; USA&#41;&#44; and arterial blood samples were obtained for blood gas determinations using an ABL560 cooxymeter &#40;Radiometer Medical A&#47;S<span class="elsevierStyleSup">&#174;</span>&#44; Copenhagen&#44; Denmark&#41;&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Upon patient admission and during the stay in the ICU&#44; we collected personal data and information referred to the diagnosis&#44; severity based on the Simplified Acute Physiology Score &#40;SAPS&#41; 2 and organ failure based on the Sequential Organ Failure Assessment &#40;SOFA&#41;&#46; We also recorded the corresponding hemodynamic&#44; respiratory&#44; blood gas and biochemical variables&#46; The duration of stay in the ICU and in hospital was registered&#44; along with the duration of mechanical ventilation&#46; In turn&#44; the complications occurring during stay in the Unit were documented&#44; such as orotracheal intubation&#44; barotrauma&#44; nosocomial infections&#44; the need for tracheotomy and mortality &#40;in the ICU&#44; in hospital&#44; and 90 days after admission&#41;&#46; The organ dysfunction rate was assessed based on the Marshall scale&#44;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> which contemplates acute renal failure &#40;with or without hemofiltration&#41; and cardiovascular&#44; hematological&#44; neurological and hepatic failure&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Noninvasive ventilatory support</span><p id="par0040" class="elsevierStylePara elsevierViewall">Use was made of the BiPAP Vision respirator<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> &#40;Respironics Inc&#46;<span class="elsevierStyleSup">&#174;</span>&#44; PA&#44; USA&#41; connected to an orofacial or Total face<span class="elsevierStyleSup"><span class="elsevierStyleItalic">&#174;</span></span> mask &#40;Respironics Inc&#46;<span class="elsevierStyleSup">&#174;</span>&#44; PA&#44; USA&#41; with an MR850 active humidification system &#40;Fischer and Payckel Healthcare Ltd&#46;&#44; New Zealand&#41;&#46; After explaining the technique to the patient&#44; the mask was fitted and we progressively increased the positive end-expiratory pressure &#40;PEEP&#41; and the support pressure to above the PEEP &#40;SP&#41;&#44; until achieving a tidal volume &#40;Vt&#41; of 10&#8211;15<span class="elsevierStyleHsp" style=""></span>ml&#47;kg and a RF of 25&#8211;28<span class="elsevierStyleHsp" style=""></span>rpm&#44; thereby ensuring a minimum SP of 10&#8211;15<span class="elsevierStyleHsp" style=""></span>cmH<span class="elsevierStyleInf">2</span>O and a PEEP of 5&#8211;6<span class="elsevierStyleHsp" style=""></span>cmH<span class="elsevierStyleInf">2</span>O in the first hour of ventilatory support&#46; The oxygen concentration was adjusted until reaching SatcO<span class="elsevierStyleInf">2</span> &#62;94&#37;&#46; Once the clinical and&#47;or blood gas condition of the patient improved&#44; gradual ventilator withdrawal was carried out until complete disconnection of NPPV&#46; The changes in FiO<span class="elsevierStyleInf">2</span> and SP&#47;PEEP levels were made according to the criterion of the supervising physician&#46; NPPV failure was considered in the presence of any of the following criteria<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a>&#58; persistence of respiratory effort or hypoxemia&#44; cognitive impairment&#44; or asynchrony with the respirator&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0115">Invasive ventilatory support</span><p id="par0045" class="elsevierStylePara elsevierViewall">Patient sedation was carried out with midazolam or propofol associated to morphine&#44; followed by orotracheal intubation and connection to the respirator&#46; Initial parameters&#58; volume control&#47;assist ventilation &#40;CMV&#47;a&#41;&#44; Vt&#58; 6&#8211;8<span class="elsevierStyleHsp" style=""></span>ml&#47;kg&#44; flow 60<span class="elsevierStyleHsp" style=""></span>l&#47;min&#44; RF&#58; 12&#8211;14<span class="elsevierStyleHsp" style=""></span>rpm&#44; FiO<span class="elsevierStyleInf">2</span> to achieve SatcO<span class="elsevierStyleInf">2</span> 94&#8211;96&#37;&#44; and minimum PEEP 5<span class="elsevierStyleHsp" style=""></span>cmH<span class="elsevierStyleInf">2</span>O&#46; Progression of the respiratory process to ARDS required modification of the ventilatory parameters<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a>&#58; Vt<span class="elsevierStyleHsp" style=""></span>&#60;6<span class="elsevierStyleHsp" style=""></span>ml&#47;kg&#44; plateau pressure<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>35<span class="elsevierStyleHsp" style=""></span>cmH<span class="elsevierStyleInf">2</span>O&#44; progressive PEEP and FiO<span class="elsevierStyleInf">2</span> as low as possible with the aim of achieving SactO<span class="elsevierStyleInf">2</span><span class="elsevierStyleHsp" style=""></span>&#62;<span class="elsevierStyleHsp" style=""></span>94&#37;&#46; After recovery&#44; weaning was started&#44; followed by extubation with the spontaneous breathing test&#46; The modifications of the ventilatory parameters and weaning were carried out by the supervising physician&#46; The patient was considered to have passed the breathing test if there was no hemodynamic or respiratory worsening during 2<span class="elsevierStyleHsp" style=""></span>h&#46; In such cases extubation was considered indicated&#44; always conditioned to medical criterion&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">The duration of mechanical ventilation included the time &#40;in days&#41; of mechanical ventilation and the weaning time&#46; Hospital stay in turn was documented as the total stay of the patient in the ICU and in hospital&#46; The application of IMV or NPPV&#44; along with the rest of supportive measures &#40;vasoactive drugs&#44; antibiotherapy&#44; renal replacement therapy&#44; blood product transfusion&#44; nutritional support&#41;&#44; was regarded as the responsibility of the attending physician at the time of admission&#44; in collaboration with the Department of Hematology&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Given the characteristics of the study&#44; informed consent from the patient and&#47;or family was not considered necessary&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0120">Statistical analysis</span><p id="par0060" class="elsevierStylePara elsevierViewall">The SPSS version 18&#46;0 statistical package was used for analysis of the results&#46; Quantitative variables were analyzed using parametric &#40;Student <span class="elsevierStyleItalic">t</span>-test&#41; or nonparametric tests &#40;Mann&#8211;Whitney <span class="elsevierStyleItalic">U</span>-test&#41;&#44; according to the results of the Kolmogorov&#8211;Smirnov test for the assessment of normal distributions&#46; Qualitative variables in turn were analyzed using the chi-squared test&#44; with the Fisher exact test &#40;2-tailed&#41; when the number of cases was under 5&#46; Statistical significance was considered for <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;05&#46; Multivariate analysis was performed based on a logistic regression model to identify factors related to mortality in the NPPV group&#46; We decided not to include the IMV group in the analysis&#44; in order to avoid bias resulting from the inclusion of a group of patients who upon admission showed significant differences with respect to the NPPV group&#46; The variables were included in the model using the enter method with a cutoff point of 0&#46;1&#46; The predictive capacity of the model was established from the Hosmer&#8211;Lemeshow test&#44; the positive predictive value&#44; the negative predictive value&#44; diagnostic accuracy&#44; and analysis of the area under the receiver operating characteristic &#40;ROC&#41; curve&#46;</p></span></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0125">Results</span><p id="par0065" class="elsevierStylePara elsevierViewall">During the study period&#44; a total of 132 patients with hematological disease were admitted to the ICU&#44; out of a total of 11&#44;501 hospitalized patients&#46; Of the mentioned 132 patients&#44; 41 required ventilatory support &#40;31&#37;&#41;&#58; NPPV in 35 cases &#40;85&#37;&#41; and IMV in 6 &#40;15&#37;&#41;&#46; The patient sample &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41; consisted mainly of males &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>26&#59; 63&#37;&#41;&#44; with a mean age of 56<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6 years&#44; a SOFA score of 7<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#44; and a SAPS 2 score of 63<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>18&#46; Comparison of the two groups showed that upon admission&#44; the IMV group had a greater incidence of organ failure as assessed by the SOFA &#40;9<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4 vs 7<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2 in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;025&#41;&#44; and a poorer prognosis as determined by the SAPS 2 &#40;66<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>17 vs 52<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>14 in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;047&#41;&#46; In contrast&#44; the time to admission to the ICU was shorter in the NPPV group &#40;3 &#91;1&#8211;15&#93; vs 26 &#91;4&#8211;43&#93; in IMV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;033&#41;&#46; Most of the patients came from hospital wards&#44; where in some cases continuous positive airway pressure &#40;CPAP&#41; had been applied as a step prior to admission to the ICU&#46; The most frequent comorbid condition in both groups was arterial hypertension&#44; the predominant disease was acute leukemia&#44; and the cause of ARF was pneumonia&#44; without significant differences&#46; The percentage of neutropenia was greater in the IMV group &#40;83&#37; vs 26&#37; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;018&#41;&#46; Comparison of the physiological parameters at baseline showed the IMV group to have more metabolic acidosis secondary to base excess &#40;&#8722;9<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>7 vs &#8722;2<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6 in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;013&#41;&#44; thrombopenia &#40;14&#44;500 &#91;11&#44;000&#8211;21&#44;000&#93; vs 96&#44;000 &#91;29&#44;000&#8211;239&#44;000&#93; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#44; leukopenia &#40;35 &#91;20&#8211;100&#93; vs 7210 &#91;670&#8211;14&#44;445&#93; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;003&#41;&#44; coagulopathy as determined by the Quick index &#40;51 &#91;21&#8211;65&#93; vs 70 &#91;52&#8211;81&#93; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;05&#41; and liver failure as estimated by bilirubin concentration &#40;5 &#91;3&#46;12&#8211;5&#46;00&#93; vs 1 &#91;0&#46;79&#8211;1&#46;55&#93; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;022&#41;&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0070" class="elsevierStylePara elsevierViewall">Regarding the clinical course &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#44; there were no significant differences between IMV and NPPV regarding the percentage of infections&#44; organ failure rate&#44; duration of mechanical ventilation&#44; or stay in the ICU and in hospital&#46; The mortality rate both in the ICU and in hospital &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a> and <a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41; was significantly higher in the IMV group &#40;100&#37; vs 37&#37; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;006&#44; in the ICU&#59; and 100&#37; vs 46&#37; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;023&#44; in hospital&#41;&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0075" class="elsevierStylePara elsevierViewall">Within the NPPV group&#44; on comparing success versus failure of the technique&#44; no significant differences were observed in relation to the demographic characteristics&#44; comorbidities or cause of respiratory failure &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46; Comparison of the physiological parameters showed differences between the success and failure of NPPV in terms of the level of PaO<span class="elsevierStyleInf">2</span> &#40;82 &#91;59&#8211;126&#93; vs 58 &#91;41&#8211;76&#93;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;005&#41;&#44; bicarbonate &#40;24<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6 vs 19<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>5&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;005&#41;&#44; excess base deficit &#40;0<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6 vs &#8722;5<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;005&#41;&#44; and blood hemoglobin &#40;9<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1 vs 10<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;005&#41;&#46; The intubation rate was 40&#37; &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#44; which implies a greater organ dysfunction rate in this group&#44; particularly as regards cardiovascular failure with the need for vasoactive support &#40;100&#37; vs 38&#37; in the patients with successful NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;0001&#41;&#46; There were no significant differences in infection rate&#44; though a shorter duration of mechanical ventilation&#44; a shorter stay in the ICU&#44; and a lesser mortality rate both in the ICU and in hospital were recorded in the group of patients with successful NPPV&#46; The mortality rate after 90 days was significantly lower &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41; in the case of successful NPPV versus either failed NPPV or the IMV group &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">The multivariate analysis of all the variables significantly related to mortality in the NPPV group &#40;<a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a>&#41; found the failure of NPPV &#40;OR 13 &#91;95&#37; CI 1&#46;95&#8211;89&#46;22&#93;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;008&#41; and the development of ARDS &#40;OR 10 &#91;95&#37; CI 1&#46;33&#8211;77&#46;9&#93;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;03&#41; to be related to mortality in the NPPV group&#46; The positive predictive value of the model was 100&#37;&#44; with a negative predictive value of 59&#37;&#44; and a diagnostic accuracy of 74&#37;&#46; The area under the ROC curve was 0&#46;88 &#40;95&#37; CI 0&#46;773&#8211;0&#46;993&#41;&#46; The Hosmer&#8211;Lemeshow test with 4 degrees of freedom &#40;d&#46;f&#46;&#41; was not significant &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;525&#41;&#46;</p><elsevierMultimedia ident="tbl0015"></elsevierMultimedia></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0130">Discussion</span><p id="par0085" class="elsevierStylePara elsevierViewall">Our retrospective study found hematological patients admitted to the ICU and subjected to mechanical ventilation due to ARF to have lesser mortality than in other series&#44;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;5&#44;7</span></a> and the use of NPPV constituted a key element in the supportive measures&#44; since it influenced the decrease in mortality among such patients&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">Of note in our series is the use of NPPV as ventilatory support measure&#59; in this sense&#44; it is common practice in our Unit to make an attempt with this technique before considering IMV&#46; Such practice has also been extended to the hospitalization ward&#44; where a percentage of admitted patients receive ventilatory support with CPAP as a step prior to admission to the ICU&#46; A randomized study<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">19</span></a> showed that the use of CPAP versus oxygen therapy in the Hematology ward in patients with ARF reduced progression toward ARDS&#44; the need for admission to the ICU&#44; and the need for invasive ventilatory support&#46; Despite these results&#44;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">19</span></a> the application of CPAP in our small sample was greater in the group in which NPPV failed&#44; and did not result in benefit of any kind&#46; In our series&#44; intubation from the start was limited to patients with multiorgan dysfunction as assessed by the SOFA score&#44; which was higher than in the NPPV group&#8211;though not all the values reached statistical significance&#46; This increased severity could account for the poor results obtained in the IMV group&#44; since all the patients died in the ICU during the first hours&#44; and mostly under conditions of multiorgan failure&#8211;this proportion being greater than expected from the SAPS 2 score&#46; Different authors<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;7</span></a> have underscored the predictive value of multiorgan failure in relation to mortality&#44; though it should be taken into account that most patients upon admission&#44; at least in our series&#44; already presented dysfunction of several organs&#46; In this sense&#44; our data coincide with the findings of a Spanish multicenter study<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> that analyzed the ventilatory support measures in hematological patients&#44; and in which the SOFA score was higher in those patients directly subjected to IMV versus the NPPV group&#44; and the initial respiratory SOFA score was similar in the IMV and NPPV &#40;success and failure&#41; groups&#8211;though in the NPPV failure group the score worsened significantly with respect to the rest of the patients over time&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">In our opinion&#44; NPPV has been a determinant factor in the reduction of mortality&#44; since as we have seen&#44; the number of complications and infections was not significantly greater in the IMV group &#40;mainly due to the brief stay in the ICU caused by early mortality&#41;&#8211;though all of them considered jointly&#44; together with the organ dysfunction already present at the time of admission&#44; probably influenced the final results obtained&#46; These results therefore reaffirm our opinion that whenever possible&#44; NPPV should be used for initial ventilatory support&#44; in concordance with the observations of most studies published to date&#44;<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#44;20&#8211;22</span></a> in which utilization of the technique has been associated with a high level of evidence&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a> Nevertheless&#44; recent studies<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;20&#44;22</span></a> continue to describe a greater use of IMV versus NPPV&#44; though these same publications<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">20&#44;22</span></a> have shown NPPV to afford a substantial decrease in mortality compared with IMV&#46; Another reason why our results are consistent with those obtained by other authors<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;11&#8211;13&#44;22&#44;24</span></a> could be the close collaboration between the Department of Hematology and our Department of Intensive Care Medicine&#44; thereby allowing earlier management of the many complications which these patients tend to present&#44; and which are difficult to deal with in a hospitalization ward&#46; The main element conditioning such close collaboration between our Departments was the introduction of NPPV in our range of therapeutic options&#46; The high mortality associated with the need for IMV<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1&#44;2&#44;6</span></a> raised some doubts about admitting such patients to our Unit&#44; in view of the important care burden involved &#40;respiratory support&#44; vasoactive and renal therapy in many cases&#44; and the adoption of isolation measures&#41;&#44; and the ominous outcomes&#46; But the introduction of NPPV and the publication of studies<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;11&#8211;13</span></a> warranting the use of this technique in immune depressed patients led to a substantial change in admission policy&#46; Another consideration was the rapid development and severity of organ dysfunction in these patients&#44; making it futile to admit such cases of established multiorgan failure to the ICU&#46; Early intervention with early admission thus proved essential&#46; In this same line&#44; some studies<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">25</span></a> point to the benefits in terms of lessened mortality of admitting patients with hematological malignancies to the ICU based on a less restrictive admission policy&#46; In this sense&#44; consideration is also required of the fact that a delay in admission to the ICU is directly correlated to mortality&#8211;thus advocating early patient admission&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p><p id="par0100" class="elsevierStylePara elsevierViewall">In this scenario favorable to NPPV&#44; doubts remain as to why the technique is still underused&#46; The reason could be the high incidence of ARDS upon admission or during patient stay in the ICU&#44; and the controversial indication of NPPV in ARDS&#46;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;26&#44;27</span></a> Different studies<a class="elsevierStyleCrossRefs" href="#bib0140"><span class="elsevierStyleSup">28&#44;29</span></a> have shown NPPV in hypoxemic patients to be more effective than oxygen therapy&#44; with particular emphasis upon ALI or ARDS<a class="elsevierStyleCrossRefs" href="#bib0150"><span class="elsevierStyleSup">30&#8211;32</span></a>&#8211;registering an NPPV failure rate of between 4&#46;8&#37;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a> and 70&#37; in ALI&#44;<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">31</span></a> and between 46&#37;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a> and 51&#37; in patients with ARDS&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a> The multivariate analysis<a class="elsevierStyleCrossRefs" href="#bib0140"><span class="elsevierStyleSup">28&#44;33</span></a> found the development of ARDS to be a predictor of NPPV failure&#8211;this possibly being the reason why there is no clear recommendation on the use of NPPV in the context of ARDS&#44;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#44;10&#44;25</span></a> and why the technique is little used in hematological patients with severe hypoxemia&#46; In contrast&#44; however&#44; the relationship between IMV and mortality in this patient population has been well established&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;5&#44;20&#8211;22</span></a> In this sense&#44; a multicenter observational study<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a> involving a series of 1302 hematological patients with ARF showed the use of NPPV to be less widespread than that of IMV &#40;21&#37; vs 79&#37;&#41;&#46; The noninvasive group presented more neutropenia &#40;16&#46;8&#37; vs 10&#37;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;002&#41; and hypoxemia than the invasive ventilation group&#46; In contrast&#44; the patients in the IMV group were in more serious condition as established by the APACHE score&#44; and had a poorer level of consciousness&#46; This may have justified the initial use of IMV&#46; A significant difference was also noted in the use of NPPV versus IMV in patients with ALI &#40;21&#37; vs 11&#37;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;0001&#41;&#46; In the case of patients with ARDS&#44; the difference failed to reach statistical significance&#46; The results showed the NPPV group to have a shorter duration of mechanical ventilation and stay in the ICU&#44; as well as lesser mortality both in the ICU and in hospital&#44; but these results were not reproduced in the subgroup of patients with ALI or ARDS&#46; Another observational study<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> found mortality after 30 days in the NPPV group to be significantly lower than in the IMV group &#40;43&#46;7&#37; vs 70&#46;8&#37;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;008&#41;&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall">On analyzing the NPPV group&#44; failure of the technique was seen to be associated with a greater complications rate&#46; These results coincide with those obtained in other studies&#44;<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">20&#44;22&#44;24&#44;30</span></a> where the failure of NPPV markedly increased the percentage of complications&#44; the duration of stay&#44; and mortality&#46; In coincidence with other authors&#44;<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">20&#44;22&#44;27&#44;28</span></a> we found mortality to be associated with failure of NPPV and development of ARDS&#44; along with other variables<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">20&#44;22</span></a> such as age&#44; septic shock&#44; coma&#44; coagulation disorders or a high SAPS 2 score&#44; which were not analyzed in our series&#46; Given the strong negative influence of NPPV failure upon mortality&#44; it seems logical to explore the factors that influence such failure&#46; In this context&#44; different studies<a class="elsevierStyleCrossRefs" href="#bib0120"><span class="elsevierStyleSup">24&#44;28</span></a> have identified delayed introduction of ventilatory support&#44; the development of ARDS&#44; and the need for vasoactive and renal support as predictors of NPPV failure&#46; Another cohort study of patients with ARDS<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">30</span></a> found severity as determined by a SAPS 2 score of &#62;34&#44; and the absence of improvement in oxygenation &#40;PaO<span class="elsevierStyleInf">2</span>&#47;FiO<span class="elsevierStyleInf">2</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>175&#41; 60<span class="elsevierStyleHsp" style=""></span>min after starting NPPV&#44; to be predictors of failure&#46; From the above it can be concluded that NPPV will probably fail if the start of the technique is delayed in a hypoxemic patient with scant clinical and blood gas response after 1<span class="elsevierStyleHsp" style=""></span>h&#8211;intubation being required in such cases&#46;</p><p id="par0110" class="elsevierStylePara elsevierViewall">The limitations of our study are represented by its retrospective nature&#44; and the fact that it was carried out in a single center where NPPV moreover is routine practice in patients with hypoxemic ARF&#46;</p><p id="par0115" class="elsevierStylePara elsevierViewall">Despite the poor results obtained in the IMV group&#44; we do not intend to discard the use of the technique&#46; Rather&#44; we wish to underscore the benefits of NPPV in extremely ill patients&#44; with a poor prognosis and with multiple organ dysfunction&#46; The routine use of NPPV&#44; and the risk of intubation particularly in these patients&#44; implies that the few individuals directly included in the IMV group were in a condition in which NPPV was literally contraindicated&#46; The conduction of a prospective study comparing NPPV versus IMV with a literature basis<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;5&#44;7</span></a> demonstrating the mortality associated to IMV&#44; along with studies<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;22</span></a> showing the good results obtained with NPPV&#44; therefore would be very questionable&#46; Consequently&#44; on the basis of our results&#44; we could recommend the use of NPPV as a first ventilatory support measure in hematological patients with ARF&#44; without considering the classical NPPV indication criteria&#44;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;26&#44;27</span></a> and without regarding ARDS or multiorgan dysfunction as exclusion criteria&#8211;since at the time of admission to the ICU&#44; most of these patients already suffer dysfunction of one or more organ systems&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0135">Conflicts of interest</span><p id="par0120" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
    "textoCompletoSecciones" => array:1 [
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          "identificador" => "xres295682"
          "titulo" => array:8 [
            0 => "Abstract"
            1 => "Objective"
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            6 => "Results"
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          "identificador" => "xpalclavsec279511"
          "titulo" => "Keywords"
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          "titulo" => array:8 [
            0 => "Resumen"
            1 => "Objetivo"
            2 => "Dise&#241;o"
            3 => "&#193;mbito"
            4 => "Pacientes"
            5 => "Variables de inter&#233;s"
            6 => "Resultados"
            7 => "Conclusi&#243;n"
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          "identificador" => "xpalclavsec279512"
          "titulo" => "Palabras clave"
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        4 => array:2 [
          "identificador" => "sec0005"
          "titulo" => "Introduction"
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        5 => array:3 [
          "identificador" => "sec0010"
          "titulo" => "Materials and methods"
          "secciones" => array:4 [
            0 => array:2 [
              "identificador" => "sec0015"
              "titulo" => "Monitorization and study variables"
            ]
            1 => array:2 [
              "identificador" => "sec0020"
              "titulo" => "Noninvasive ventilatory support"
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            2 => array:2 [
              "identificador" => "sec0025"
              "titulo" => "Invasive ventilatory support"
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            3 => array:2 [
              "identificador" => "sec0030"
              "titulo" => "Statistical analysis"
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          "identificador" => "sec0035"
          "titulo" => "Results"
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          "titulo" => "Discussion"
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          "identificador" => "sec0045"
          "titulo" => "Conflicts of interest"
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          "titulo" => "References"
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    "pdfFichero" => "main.pdf"
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    "fechaRecibido" => "2012-08-27"
    "fechaAceptado" => "2012-12-21"
    "PalabrasClave" => array:2 [
      "en" => array:1 [
        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "Keywords"
          "identificador" => "xpalclavsec279511"
          "palabras" => array:5 [
            0 => "Hematological malignancy"
            1 => "Noninvasive positive pressure ventilation"
            2 => "Pneumonia"
            3 => "Invasive mechanical ventilation"
            4 => "Acute respiratory failure"
          ]
        ]
      ]
      "es" => array:1 [
        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "Palabras clave"
          "identificador" => "xpalclavsec279512"
          "palabras" => array:5 [
            0 => "Enfermedad hematol&#243;gica"
            1 => "Ventilaci&#243;n mec&#225;nica no invasiva"
            2 => "Neumon&#237;a"
            3 => "Ventilaci&#243;n mec&#225;nica invasiva"
            4 => "Insuficiencia respiratoria aguda"
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    "resumen" => array:2 [
      "en" => array:2 [
        "titulo" => "Abstract"
        "resumen" => "<span class="elsevierStyleSectionTitle" id="sect0010">Objective</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">A comparison was made between invasive mechanical ventilation &#40;IMV&#41; and noninvasive positive pressure ventilation &#40;NPPV&#41; in hematological patients with acute respiratory failure&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0015">Design</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">A retrospective observational study was made from 2001 to December 2011&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0020">Setting</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">A clinical&#8211;surgical intensive care unit &#40;ICU&#41; in a tertiary hospital&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0025">Patients</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Patients with hematological malignancies suffering acute respiratory failure &#40;ARF&#41; and requiring mechanical ventilation in the form of either IMV or NPPV&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0030">Variables of interest</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Analysis of infection and organ failure rates&#44; duration of mechanical ventilation and ICU and hospital stays&#44; as well as ICU&#44; hospital and mortality after 90 days&#46; The same variables were analyzed in the comparison between NPPV success and failure&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0035">Results</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Forty-one patients were included&#44; of which 35 required IMV and 6 NPPV&#46; ICU mortality was higher in the IMV group &#40;100&#37; vs 37&#37; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>&#46;006&#41;&#46; The intubation rate in NPPV was 40&#37;&#46; Compared with successful NPPV&#44; failure in the NPPV group involved more complications&#44; a longer duration of mechanical ventilation and ICU stay&#44; and greater ICU and hospital mortality&#46; Multivariate analysis of mortality in the NPPV group identified NPPV failure &#40;OR 13 &#91;95&#37; CI 1&#46;33&#8211;77&#46;96&#93;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>&#46;008&#41; and progression to acute respiratory distress syndrome &#40;OR 10 &#91;95&#37; CI 1&#46;95&#8211;89&#46;22&#93;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>&#46;03&#41; as prognostic factors&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0040">Conclusion</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">The use of NPPV reduced mortality compared with IMV&#46; NPPV failure was associated with more complications&#46;</p>"
      ]
      "es" => array:2 [
        "titulo" => "Resumen"
        "resumen" => "<span class="elsevierStyleSectionTitle" id="sect0050">Objetivo</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Comparaci&#243;n de la ventilaci&#243;n mec&#225;nica invasiva &#40;VMI&#41; frente a la no invasiva &#40;VMNI&#41; en pacientes hematol&#243;gicos que desarrollaron insuficiencia respiratoria aguda &#40;IRA&#41;&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0055">Dise&#241;o</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Estudio observacional retrospectivo desde 2001 y hasta diciembre de 2011&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0060">&#193;mbito</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Unidad de cuidados intensivos &#40;UCI&#41; m&#233;dico-quir&#250;rgica de un hospital de tercer nivel&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0065">Pacientes</span><p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">Aquellos con patolog&#237;a hematol&#243;gica con IRA y que precisaron ventilaci&#243;n mec&#225;nica &#40;VM&#41;&#44; tanto VMI como VMNI&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0070">Variables de inter&#233;s</span><p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">N&#250;mero de infeccciones y fracaso de &#243;rganos&#44; duraci&#243;n de VM y estancias en la unidad y hospitalaria&#44; as&#237; como mortalidad en UCI&#44; hospitalaria y a los 90 d&#237;as&#46; En el subgrupo de VMNI se compar&#243; &#233;xito y fracaso en cuanto a las variables mencionadas&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0075">Resultados</span><p id="spar0065" class="elsevierStyleSimplePara elsevierViewall">Se incluyeron 41 pacientes que precisaron VM&#44; 35 con VMNI y 6 con VMI&#46; La mortalidad en UCI fue superior en VMI &#40;100 vs 37&#37; en VMNI&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;006&#41;&#46; El porcentaje de intubaci&#243;n en VMNI fue del 40&#37;&#46; El grupo fracaso de VMNI present&#243; mayor tasa de complicaciones&#44; mayor duraci&#243;n de la VM&#44; mayor estancia en UCI&#44; as&#237; como de mortalidad en UCI y hospitalaria que el grupo que no precis&#243; intubaci&#243;n&#46; El an&#225;lisis multivariante de mortalidad en el grupo VMNI estaba relacionada con el fracaso de la VMNI &#40;OR 13 &#91;IC 95&#37; 1&#44;33&#8211;77&#44;96&#93;&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;008&#41; y el desarrollo de s&#237;ndrome de distr&#233;s respiratorio del adulto &#40;OR 10 &#91;IC 95&#37; 1&#44;95&#8211;89&#44;22&#93;&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;03&#41;&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0080">Conclusi&#243;n</span><p id="spar0070" class="elsevierStyleSimplePara elsevierViewall">La utilizaci&#243;n de VMNI redujo la mortalidad en comparaci&#243;n con la VMI&#46; El fracaso de la VMNI llev&#243; aparejada una mayor tasa de complicaciones&#46;</p>"
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        "etiqueta" => "&#9734;"
        "nota" => "<p class="elsevierStyleNotepara" id="npar0070">Please cite this article as&#58; Belenguer-Muncharaz A&#44; Albert-Rodrigo L&#44; Ferrandiz-Sell&#233;s A&#44; Cebri&#225;n-Graullera G&#46; Evoluci&#243;n de 10 a&#241;os de aplicaci&#243;n de la ventilaci&#243;n mec&#225;nica en la insuficiencia respiratoria aguda del paciente hematol&#243;gico ingresado en la unidad de cuidados intensivos&#46; Med Intensiva&#46; 2013&#59;37&#58;452&#8211;460&#46;</p>"
      ]
    ]
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      0 => array:7 [
        "identificador" => "fig0005"
        "etiqueta" => "Figure 1"
        "tipo" => "MULTIMEDIAFIGURA"
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        "mostrarDisplay" => false
        "figura" => array:1 [
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        "descripcion" => array:1 [
          "en" => "<p id="spar0075" class="elsevierStyleSimplePara elsevierViewall">Kaplan&#8211;Meier survival analysis &#40;log-rank test&#41; between the NPPV group &#40;success and failure&#41; and the IMV group after 90 days&#46; Table&#58; number of patients alive during this period of time&#46; IMV&#44; invasive mechanical ventilation&#59; NPPV&#44; noninvasive positive pressure ventilation&#59; NPPV OTI&#44; intubated noninvasive ventilation&#59; NPPV-NO OTI&#44; non-intubated noninvasive ventilation&#46;</p>"
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        "tabla" => array:3 [
          "leyenda" => "<p id="spar0085" class="elsevierStyleSimplePara elsevierViewall">CPAP&#44; continuous positive airway pressure&#59; COPD&#44; chronic obstructive pulmonary disease&#59; ARF&#44; acute respiratory failure&#59; SAPS 2&#44; Simplified Acute Physiology Score &#40;range 0&#8211;56&#41;&#59; SOFA&#44; Sequential Organ Failure Assessment&#59; TRALI&#44; transfusion-related acute lung injury&#59; ICU&#44; Intensive Care Unit&#59; IMV&#44; invasive mechanical ventilation&#59; NPPV&#44; noninvasive positive pressure ventilation&#46;</p>"
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                  \t\t\t\t\tvoid\n
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                  \t\t\t\t\ttable-head\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">Variables&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">Global&#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>41&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">NPPV&#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>35&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">NPPV success &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>21&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">NPPV failure&#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>14&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">IMV<a class="elsevierStyleCrossRef" href="#tblfn0015"><span class="elsevierStyleSup">c</span></a>&#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>6&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">p</span><a class="elsevierStyleCrossRef" href="#tblfn0045"><span class="elsevierStyleSup">&#42;</span></a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">Sex&#44; male &#40;n</span><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">&#61;</span><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">26&#41;&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">26 &#40;63&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">22 &#40;63&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Other ICU&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">Comorbidities&#44; n &#40;&#37;&#41;</span></td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Arterial hypertension&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>COPD&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Congestive heart failure&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Diabetes mellitus&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Previous cancer<a class="elsevierStyleCrossRef" href="#tblfn0020"><span class="elsevierStyleSup">d</span></a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Smoking&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Chronic renal failure&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">Neutropenia&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">Type of hematological disease</span></td><td class="td" title="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Acute leukemia&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">13 &#40;37&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7 &#40;33&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">6 &#40;43&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">5 &#40;83&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Non-Hodgkin lymphoma&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">9 &#40;22&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">9 &#40;26&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7 &#40;33&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">2 &#40;14&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Multiple myeloma&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">8 &#40;19&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7 &#40;20&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">5 &#40;24&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">2 &#40;14&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1 &#40;17&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Others<a class="elsevierStyleCrossRef" href="#tblfn0025"><span class="elsevierStyleSup">e</span></a>&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">6 &#40;15&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">6 &#40;17&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">2 &#40;10&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">4 &#40;29&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " colspan="7" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="7" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">Cause of acute respiratory failure</span>&#44; n &#40;&#37;&#41;</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Pneumonia<a class="elsevierStyleCrossRef" href="#tblfn0030"><span class="elsevierStyleSup">f</span></a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">16 &#40;39&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">15 &#40;43&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">8 &#40;38&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7 &#40;50&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1 &#40;17&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Sepsis<a class="elsevierStyleCrossRef" href="#tblfn0035"><span class="elsevierStyleSup">g</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">16 &#40;39&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">12 &#40;33&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7 &#40;33&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">5 &#40;35&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">4 &#40;66&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>ARF of pulmonary origin<a class="elsevierStyleCrossRef" href="#tblfn0040"><span class="elsevierStyleSup">h</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">6 &#40;14&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">6 &#40;17&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">5 &#40;24&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1 &#40;7&#46;5&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Acute lung edema&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">1 &#40;2&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Postoperative ARF&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>TRALI&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">1 &#40;2&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1 &#40;17&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
              ]
              "imagenFichero" => array:1 [
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              "identificador" => "tblfn0015"
              "etiqueta" => "c"
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              "identificador" => "tblfn0020"
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              "nota" => "<p class="elsevierStyleNotepara" id="npar0020">Causes of cancer&#58; NPPV &#40;prostate&#44; ear&#44; nose and throat&#44; gastrointestinal&#41;&#44; IMV &#40;gynecological&#41;&#46;</p>"
            ]
            4 => array:3 [
              "identificador" => "tblfn0025"
              "etiqueta" => "e"
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            ]
            5 => array:3 [
              "identificador" => "tblfn0030"
              "etiqueta" => "f"
              "nota" => "<p class="elsevierStyleNotepara" id="npar0030">Cause of pneumonia&#58; pneumococcus &#40;3 cases&#41;&#44; H1N1 influenza &#40;1 case&#41;&#44; rest unknown&#46;</p>"
            ]
            6 => array:3 [
              "identificador" => "tblfn0035"
              "etiqueta" => "g"
              "nota" => "<p class="elsevierStyleNotepara" id="npar0035">Causes of sepsis&#58; bacteremia &#40;5 cases in NPPV and 1 case in IMV&#41;&#44; unknown focus &#40;4 cases in NPPV&#41;&#44; urological &#40;1 case in NPPV&#41;&#44; infections from blood products &#40;1 case in NPPV&#41;&#44; soft tissues &#40;2 cases in IMV&#41;&#44; ear&#44; nose and throat &#40;1 case in IMV&#41;&#44; abdominal &#40;1 case in NPPV&#41;&#46;</p>"
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          "leyenda" => "<p id="spar0095" class="elsevierStyleSimplePara elsevierViewall">ARDS&#44; adult respiratory distress syndrome&#59; ICU&#44; Intensive Care Unit&#59; IMV&#44; invasive mechanical ventilation&#59; NPPV&#44; noninvasive positive pressure ventilation&#59; VAP&#44; ventilator associated pneumonia&#46;</p>"
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                  \t\t\t\t" style="border-bottom: 2px solid black">NPPV &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>35&#41;</td><td class="td" title="\n
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                  \t\t\t\t">IMV &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>6&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">p</span><a class="elsevierStyleCrossRef" href="#tblfn0050"><span class="elsevierStyleSup">&#42;</span></a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleBold">VAP&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1 &#40;17&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Bacteremia&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Primary bacteremia</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Catheter-related bacteremia</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Secondary bacteremia</span><a class="elsevierStyleCrossRef" href="#tblfn0060"><span class="elsevierStyleSup">a</span></a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="7" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " colspan="7" align="left" valign="\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Cardiac arrest&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Tracheostomy&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Duration mechanical ventilation</span><a class="elsevierStyleCrossRef" href="#tblfn0065"><span class="elsevierStyleSup">b</span></a>&#44; <span class="elsevierStyleBold">days</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">8<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>9&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">4<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">13<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>12&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">3<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;269&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Stay in ICU</span><a class="elsevierStyleCrossRef" href="#tblfn0065"><span class="elsevierStyleSup">b</span></a>&#44; <span class="elsevierStyleBold">days</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">11<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>11&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">7<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;025&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">5<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>10&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Stay in hospital</span><a class="elsevierStyleCrossRef" href="#tblfn0065"><span class="elsevierStyleSup">b</span></a>&#44; <span class="elsevierStyleBold">days</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">34<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>19&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">32<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>21&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;800&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">26<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>26&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;554&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " colspan="7" align="left" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Mortality in ICU&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">13 &#40;37&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">3 &#40;14&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">10 &#40;71&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">6 &#40;100&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;006&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Causes of death</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Multiorgan failure&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">9&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">2&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Cardiac arrest&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Cerebral hemorrhage&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Refractory hypoxemia&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="7" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Mortality in hospital&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">16 &#40;46&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">6 &#40;28&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">10 &#40;71&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;018&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">6 &#40;100&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;023&nbsp;\t\t\t\t\t\t\n
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                  """
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          "en" => "<p id="spar0090" class="elsevierStyleSimplePara elsevierViewall">Comparison of complication rates&#44; duration of ventilation and duration of stay between NPPV &#40;both success and failure&#41; and IMV&#46;</p>"
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          "leyenda" => "<p id="spar0105" class="elsevierStyleSimplePara elsevierViewall">95&#37; CI&#44; 95&#37; confidence interval&#59; CRA&#44; cardiorespiratory arrest&#59; ARDS&#44; adult respiratory distress syndrome&#59; NPPV&#44; noninvasive positive pressure ventilation&#46;</p>"
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                  \t\t\t\t" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">NPPV non-survivors &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>13&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;236&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">CRA&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                      "titulo" => "Outocomes of critically ill cancer patients in a university hospital setting"
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                          "autores" => array:5 [
                            0 => "J&#46;P&#46; Kress"
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                            3 => "D&#46;R&#46; Linkin"
                            4 => "J&#46; Hall"
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                        "tituloSerie" => "Am J Respir Crit Care Med"
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                        "paginaFinal" => "1961"
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                            3 => "F&#46; Blot"
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                        "tituloSerie" => "J Clin Oncol"
                        "fecha" => "2006"
                        "volumen" => "24"
                        "paginaInicial" => "643"
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Ten-year evolution of mechanical ventilation in acute respiratory failure in the hematogical patient admitted to the intensive care unit
Evolución de 10 años de aplicación de la ventilación mecánica en la insuficiencia respiratoria aguda del paciente hematológico ingresado en la unidad de cuidados intensivos
A. Belenguer-Muncharaz
Corresponding author
belenguer_alb@gva.es

Corresponding author.
, L. Albert-Rodrigo, A. Ferrandiz-Sellés, G. Cebrián-Graullera
Servicio de Medicina Intensiva, Hospital General de Castellón, Castellón de la Plana, Spain
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          "en" => "<p id="spar0075" class="elsevierStyleSimplePara elsevierViewall">Kaplan&#8211;Meier survival analysis &#40;log-rank test&#41; between the NPPV group &#40;success and failure&#41; and the IMV group after 90 days&#46; Table&#58; number of patients alive during this period of time&#46; IMV&#44; invasive mechanical ventilation&#59; NPPV&#44; noninvasive positive pressure ventilation&#59; NPPV OTI&#44; intubated noninvasive ventilation&#59; NPPV-NO OTI&#44; non-intubated noninvasive ventilation&#46;</p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">The prognosis of malignant hematological disease has improved over the last few decades&#44;<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1&#44;2</span></a> though patients requiring admission to the intensive care unit &#40;ICU&#41; continue to present a high mortality rate&#46;<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1&#8211;5</span></a> The main cause of admission to the ICU is the development of acute respiratory failure &#40;ARF&#41;&#44; sometimes requiring ventilatory support&#44;<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1&#8211;7</span></a> due to the appearance of both infectious and non-infectious pulmonary infiltrates&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> On the other hand&#44; mechanical ventilation &#40;MV&#41;&#44; and particularly invasive mechanical ventilation &#40;IMV&#41;&#44; has been shown to be one of the risk factors of mortality in the ICU&#46;<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1&#44;2</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The development of noninvasive positive pressure ventilation &#40;NPPV&#41; as a ventilatory support technique has represented a great step forward in the ventilatory care of critically ill patients&#46; NPPV offers a series of benefits&#44;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#44;10</span></a> since it lessens the need for orotracheal intubation thanks to resting of the muscle burden generated by the respiratory disease underlying ARF&#59; improves oxygenation&#59; and facilitates the elimination of carbon dioxide&#46; As a direct consequence of this&#44; NPPV is able to reduce the incidence of ventilator associated pneumonia &#40;VAP&#41; and shorten patient stay in the ICU and in hospital&#44; especially in immune depressed individuals&#46; Nevertheless&#44; despite these reported benefits and the existence of studies supporting the success of the technique&#44;<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;10&#8211;13</span></a> NPPV is still less widely used than expected&#44; and IMV remains the gold standard for the ventilation support of these patients&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">The present study analyzes the incidence of ARF in hematological patients admitted to the ICU and requiring mechanical ventilation &#40;invasive and noninvasive&#41;&#44; with the purpose of determining whether NPPV is superior to IMV in terms of the development of infections&#44; organ failure&#44; the duration of mechanical ventilation&#44; the duration of stay in the ICU and in hospital&#44; and mortality in the ICU&#44; in hospital&#44; and after 90 days&#46; Likewise&#44; an analysis was made of the incidence of NPPV failure&#44; comparing the same variables between the success and failure groups&#44; and of the factors related to mortality in the NPPV group&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Materials and methods</span><p id="par0020" class="elsevierStylePara elsevierViewall">A retrospective observational was carried out&#44; following approval by the hospital Clinical Research Ethics Committee&#46; We included all hematological patients with ARF admitted to the ICU between January 2001 and December 2011&#44; and who required ventilatory support&#46; The hematological diseases mainly comprised acute leukemia &#40;lymphoblastic or myelocytic&#41;&#44; non-Hodgkin lymphoma&#44; multiple myeloma&#44; chronic leukemia and Hodgkin&#39;s disease&#46; The patients had received chemotherapy&#44; corticosteroid therapy or treatment in the form of hematopoietic precursor cell transplantation&#46; Neutropenia was defined as a leukocyte count of under 1000<span class="elsevierStyleHsp" style=""></span>cells&#47;mm<span class="elsevierStyleSup">3</span>&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">Acute respiratory failure was defined as a respiratory frequency &#40;RF&#41; of &#62;30<span class="elsevierStyleHsp" style=""></span>rpm&#44; a partial oxygen pressure &#40;PaO<span class="elsevierStyleInf">2</span>&#41; of &#60;60<span class="elsevierStyleHsp" style=""></span>mmHg or a partial carbon dioxide pressure &#40;PaCO<span class="elsevierStyleInf">2</span>&#41; of &#62;45<span class="elsevierStyleHsp" style=""></span>mmHg&#46; Community-acquired pneumonia &#40;CAP&#41; was considered as a lower airway infection characterized by opacifications on the chest X-rays&#44; signs and symptoms of respiratory infection such as fever&#44; cough&#44; pleuritic pain&#44; leukocytosis or leukopenia&#44; and the presence or absence of secretions&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a> Hypoxemic conditions were classified as acute lung injury &#40;ALI&#41; or adult respiratory distress syndrome &#40;ARDS&#41;&#44; based on the following criteria<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a>&#58; bilateral infiltration&#44; pulmonary wedge pressure<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>18<span class="elsevierStyleHsp" style=""></span>mmHg&#44; PaO<span class="elsevierStyleInf">2</span>&#47;FiO<span class="elsevierStyleInf">2</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>300 &#40;ALI&#41; or PaO<span class="elsevierStyleInf">2</span>&#47;FiO<span class="elsevierStyleInf">2</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>200 &#40;ARDS&#41;&#46; For the microbiological study we determined soluble antigens in urine&#44; and peripheral blood samples were obtained for blood culture and pneumonia serological testing&#46; Lastly&#44; where possible&#44; we obtained sputum for culture and gram staining&#46; Nasopharyngeal aspiration in turn was performed for determination of the new H1N1 influenza virus &#8211; this test being carried out on a routine basis since 2009 in all cases of pneumonia exhibiting an interstitial radiological pattern&#46; Non-bronchoscopic invasive samples &#40;bronchoalveolar lavage and bronchial aspirate&#41;&#44; were collected once the patients were intubated&#46; The criteria for sepsis and septic shock were established according to the literature&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a></p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Monitorization and study variables</span><p id="par0030" class="elsevierStylePara elsevierViewall">Upon patient admission&#44; invasive hemodynamic monitorization was carried out&#44; with arterial catheterization and a central venous line&#46; Respiratory monitorization in turn was carried out by recording transcutaneous oxygen saturation &#40;SatcO<span class="elsevierStyleInf">2</span>&#41; with an Oxisensor Nellcor <span class="elsevierStyleSmallCaps">II</span> D-25 pulsioxymeter &#40;Nellcor<span class="elsevierStyleSup">&#174;</span> Puritan Bennet Inc&#46;&#44; Decasanton&#44; CA&#44; USA&#41;&#44; and arterial blood samples were obtained for blood gas determinations using an ABL560 cooxymeter &#40;Radiometer Medical A&#47;S<span class="elsevierStyleSup">&#174;</span>&#44; Copenhagen&#44; Denmark&#41;&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Upon patient admission and during the stay in the ICU&#44; we collected personal data and information referred to the diagnosis&#44; severity based on the Simplified Acute Physiology Score &#40;SAPS&#41; 2 and organ failure based on the Sequential Organ Failure Assessment &#40;SOFA&#41;&#46; We also recorded the corresponding hemodynamic&#44; respiratory&#44; blood gas and biochemical variables&#46; The duration of stay in the ICU and in hospital was registered&#44; along with the duration of mechanical ventilation&#46; In turn&#44; the complications occurring during stay in the Unit were documented&#44; such as orotracheal intubation&#44; barotrauma&#44; nosocomial infections&#44; the need for tracheotomy and mortality &#40;in the ICU&#44; in hospital&#44; and 90 days after admission&#41;&#46; The organ dysfunction rate was assessed based on the Marshall scale&#44;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> which contemplates acute renal failure &#40;with or without hemofiltration&#41; and cardiovascular&#44; hematological&#44; neurological and hepatic failure&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Noninvasive ventilatory support</span><p id="par0040" class="elsevierStylePara elsevierViewall">Use was made of the BiPAP Vision respirator<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> &#40;Respironics Inc&#46;<span class="elsevierStyleSup">&#174;</span>&#44; PA&#44; USA&#41; connected to an orofacial or Total face<span class="elsevierStyleSup"><span class="elsevierStyleItalic">&#174;</span></span> mask &#40;Respironics Inc&#46;<span class="elsevierStyleSup">&#174;</span>&#44; PA&#44; USA&#41; with an MR850 active humidification system &#40;Fischer and Payckel Healthcare Ltd&#46;&#44; New Zealand&#41;&#46; After explaining the technique to the patient&#44; the mask was fitted and we progressively increased the positive end-expiratory pressure &#40;PEEP&#41; and the support pressure to above the PEEP &#40;SP&#41;&#44; until achieving a tidal volume &#40;Vt&#41; of 10&#8211;15<span class="elsevierStyleHsp" style=""></span>ml&#47;kg and a RF of 25&#8211;28<span class="elsevierStyleHsp" style=""></span>rpm&#44; thereby ensuring a minimum SP of 10&#8211;15<span class="elsevierStyleHsp" style=""></span>cmH<span class="elsevierStyleInf">2</span>O and a PEEP of 5&#8211;6<span class="elsevierStyleHsp" style=""></span>cmH<span class="elsevierStyleInf">2</span>O in the first hour of ventilatory support&#46; The oxygen concentration was adjusted until reaching SatcO<span class="elsevierStyleInf">2</span> &#62;94&#37;&#46; Once the clinical and&#47;or blood gas condition of the patient improved&#44; gradual ventilator withdrawal was carried out until complete disconnection of NPPV&#46; The changes in FiO<span class="elsevierStyleInf">2</span> and SP&#47;PEEP levels were made according to the criterion of the supervising physician&#46; NPPV failure was considered in the presence of any of the following criteria<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a>&#58; persistence of respiratory effort or hypoxemia&#44; cognitive impairment&#44; or asynchrony with the respirator&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0115">Invasive ventilatory support</span><p id="par0045" class="elsevierStylePara elsevierViewall">Patient sedation was carried out with midazolam or propofol associated to morphine&#44; followed by orotracheal intubation and connection to the respirator&#46; Initial parameters&#58; volume control&#47;assist ventilation &#40;CMV&#47;a&#41;&#44; Vt&#58; 6&#8211;8<span class="elsevierStyleHsp" style=""></span>ml&#47;kg&#44; flow 60<span class="elsevierStyleHsp" style=""></span>l&#47;min&#44; RF&#58; 12&#8211;14<span class="elsevierStyleHsp" style=""></span>rpm&#44; FiO<span class="elsevierStyleInf">2</span> to achieve SatcO<span class="elsevierStyleInf">2</span> 94&#8211;96&#37;&#44; and minimum PEEP 5<span class="elsevierStyleHsp" style=""></span>cmH<span class="elsevierStyleInf">2</span>O&#46; Progression of the respiratory process to ARDS required modification of the ventilatory parameters<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a>&#58; Vt<span class="elsevierStyleHsp" style=""></span>&#60;6<span class="elsevierStyleHsp" style=""></span>ml&#47;kg&#44; plateau pressure<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>35<span class="elsevierStyleHsp" style=""></span>cmH<span class="elsevierStyleInf">2</span>O&#44; progressive PEEP and FiO<span class="elsevierStyleInf">2</span> as low as possible with the aim of achieving SactO<span class="elsevierStyleInf">2</span><span class="elsevierStyleHsp" style=""></span>&#62;<span class="elsevierStyleHsp" style=""></span>94&#37;&#46; After recovery&#44; weaning was started&#44; followed by extubation with the spontaneous breathing test&#46; The modifications of the ventilatory parameters and weaning were carried out by the supervising physician&#46; The patient was considered to have passed the breathing test if there was no hemodynamic or respiratory worsening during 2<span class="elsevierStyleHsp" style=""></span>h&#46; In such cases extubation was considered indicated&#44; always conditioned to medical criterion&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">The duration of mechanical ventilation included the time &#40;in days&#41; of mechanical ventilation and the weaning time&#46; Hospital stay in turn was documented as the total stay of the patient in the ICU and in hospital&#46; The application of IMV or NPPV&#44; along with the rest of supportive measures &#40;vasoactive drugs&#44; antibiotherapy&#44; renal replacement therapy&#44; blood product transfusion&#44; nutritional support&#41;&#44; was regarded as the responsibility of the attending physician at the time of admission&#44; in collaboration with the Department of Hematology&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Given the characteristics of the study&#44; informed consent from the patient and&#47;or family was not considered necessary&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0120">Statistical analysis</span><p id="par0060" class="elsevierStylePara elsevierViewall">The SPSS version 18&#46;0 statistical package was used for analysis of the results&#46; Quantitative variables were analyzed using parametric &#40;Student <span class="elsevierStyleItalic">t</span>-test&#41; or nonparametric tests &#40;Mann&#8211;Whitney <span class="elsevierStyleItalic">U</span>-test&#41;&#44; according to the results of the Kolmogorov&#8211;Smirnov test for the assessment of normal distributions&#46; Qualitative variables in turn were analyzed using the chi-squared test&#44; with the Fisher exact test &#40;2-tailed&#41; when the number of cases was under 5&#46; Statistical significance was considered for <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;05&#46; Multivariate analysis was performed based on a logistic regression model to identify factors related to mortality in the NPPV group&#46; We decided not to include the IMV group in the analysis&#44; in order to avoid bias resulting from the inclusion of a group of patients who upon admission showed significant differences with respect to the NPPV group&#46; The variables were included in the model using the enter method with a cutoff point of 0&#46;1&#46; The predictive capacity of the model was established from the Hosmer&#8211;Lemeshow test&#44; the positive predictive value&#44; the negative predictive value&#44; diagnostic accuracy&#44; and analysis of the area under the receiver operating characteristic &#40;ROC&#41; curve&#46;</p></span></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0125">Results</span><p id="par0065" class="elsevierStylePara elsevierViewall">During the study period&#44; a total of 132 patients with hematological disease were admitted to the ICU&#44; out of a total of 11&#44;501 hospitalized patients&#46; Of the mentioned 132 patients&#44; 41 required ventilatory support &#40;31&#37;&#41;&#58; NPPV in 35 cases &#40;85&#37;&#41; and IMV in 6 &#40;15&#37;&#41;&#46; The patient sample &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41; consisted mainly of males &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>26&#59; 63&#37;&#41;&#44; with a mean age of 56<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6 years&#44; a SOFA score of 7<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#44; and a SAPS 2 score of 63<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>18&#46; Comparison of the two groups showed that upon admission&#44; the IMV group had a greater incidence of organ failure as assessed by the SOFA &#40;9<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4 vs 7<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2 in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;025&#41;&#44; and a poorer prognosis as determined by the SAPS 2 &#40;66<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>17 vs 52<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>14 in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;047&#41;&#46; In contrast&#44; the time to admission to the ICU was shorter in the NPPV group &#40;3 &#91;1&#8211;15&#93; vs 26 &#91;4&#8211;43&#93; in IMV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;033&#41;&#46; Most of the patients came from hospital wards&#44; where in some cases continuous positive airway pressure &#40;CPAP&#41; had been applied as a step prior to admission to the ICU&#46; The most frequent comorbid condition in both groups was arterial hypertension&#44; the predominant disease was acute leukemia&#44; and the cause of ARF was pneumonia&#44; without significant differences&#46; The percentage of neutropenia was greater in the IMV group &#40;83&#37; vs 26&#37; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;018&#41;&#46; Comparison of the physiological parameters at baseline showed the IMV group to have more metabolic acidosis secondary to base excess &#40;&#8722;9<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>7 vs &#8722;2<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6 in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;013&#41;&#44; thrombopenia &#40;14&#44;500 &#91;11&#44;000&#8211;21&#44;000&#93; vs 96&#44;000 &#91;29&#44;000&#8211;239&#44;000&#93; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#44; leukopenia &#40;35 &#91;20&#8211;100&#93; vs 7210 &#91;670&#8211;14&#44;445&#93; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;003&#41;&#44; coagulopathy as determined by the Quick index &#40;51 &#91;21&#8211;65&#93; vs 70 &#91;52&#8211;81&#93; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;05&#41; and liver failure as estimated by bilirubin concentration &#40;5 &#91;3&#46;12&#8211;5&#46;00&#93; vs 1 &#91;0&#46;79&#8211;1&#46;55&#93; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;022&#41;&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0070" class="elsevierStylePara elsevierViewall">Regarding the clinical course &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#44; there were no significant differences between IMV and NPPV regarding the percentage of infections&#44; organ failure rate&#44; duration of mechanical ventilation&#44; or stay in the ICU and in hospital&#46; The mortality rate both in the ICU and in hospital &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a> and <a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41; was significantly higher in the IMV group &#40;100&#37; vs 37&#37; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;006&#44; in the ICU&#59; and 100&#37; vs 46&#37; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;023&#44; in hospital&#41;&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0075" class="elsevierStylePara elsevierViewall">Within the NPPV group&#44; on comparing success versus failure of the technique&#44; no significant differences were observed in relation to the demographic characteristics&#44; comorbidities or cause of respiratory failure &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46; Comparison of the physiological parameters showed differences between the success and failure of NPPV in terms of the level of PaO<span class="elsevierStyleInf">2</span> &#40;82 &#91;59&#8211;126&#93; vs 58 &#91;41&#8211;76&#93;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;005&#41;&#44; bicarbonate &#40;24<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6 vs 19<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>5&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;005&#41;&#44; excess base deficit &#40;0<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6 vs &#8722;5<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;005&#41;&#44; and blood hemoglobin &#40;9<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1 vs 10<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;005&#41;&#46; The intubation rate was 40&#37; &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#44; which implies a greater organ dysfunction rate in this group&#44; particularly as regards cardiovascular failure with the need for vasoactive support &#40;100&#37; vs 38&#37; in the patients with successful NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;0001&#41;&#46; There were no significant differences in infection rate&#44; though a shorter duration of mechanical ventilation&#44; a shorter stay in the ICU&#44; and a lesser mortality rate both in the ICU and in hospital were recorded in the group of patients with successful NPPV&#46; The mortality rate after 90 days was significantly lower &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41; in the case of successful NPPV versus either failed NPPV or the IMV group &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">The multivariate analysis of all the variables significantly related to mortality in the NPPV group &#40;<a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a>&#41; found the failure of NPPV &#40;OR 13 &#91;95&#37; CI 1&#46;95&#8211;89&#46;22&#93;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;008&#41; and the development of ARDS &#40;OR 10 &#91;95&#37; CI 1&#46;33&#8211;77&#46;9&#93;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;03&#41; to be related to mortality in the NPPV group&#46; The positive predictive value of the model was 100&#37;&#44; with a negative predictive value of 59&#37;&#44; and a diagnostic accuracy of 74&#37;&#46; The area under the ROC curve was 0&#46;88 &#40;95&#37; CI 0&#46;773&#8211;0&#46;993&#41;&#46; The Hosmer&#8211;Lemeshow test with 4 degrees of freedom &#40;d&#46;f&#46;&#41; was not significant &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;525&#41;&#46;</p><elsevierMultimedia ident="tbl0015"></elsevierMultimedia></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0130">Discussion</span><p id="par0085" class="elsevierStylePara elsevierViewall">Our retrospective study found hematological patients admitted to the ICU and subjected to mechanical ventilation due to ARF to have lesser mortality than in other series&#44;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;5&#44;7</span></a> and the use of NPPV constituted a key element in the supportive measures&#44; since it influenced the decrease in mortality among such patients&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">Of note in our series is the use of NPPV as ventilatory support measure&#59; in this sense&#44; it is common practice in our Unit to make an attempt with this technique before considering IMV&#46; Such practice has also been extended to the hospitalization ward&#44; where a percentage of admitted patients receive ventilatory support with CPAP as a step prior to admission to the ICU&#46; A randomized study<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">19</span></a> showed that the use of CPAP versus oxygen therapy in the Hematology ward in patients with ARF reduced progression toward ARDS&#44; the need for admission to the ICU&#44; and the need for invasive ventilatory support&#46; Despite these results&#44;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">19</span></a> the application of CPAP in our small sample was greater in the group in which NPPV failed&#44; and did not result in benefit of any kind&#46; In our series&#44; intubation from the start was limited to patients with multiorgan dysfunction as assessed by the SOFA score&#44; which was higher than in the NPPV group&#8211;though not all the values reached statistical significance&#46; This increased severity could account for the poor results obtained in the IMV group&#44; since all the patients died in the ICU during the first hours&#44; and mostly under conditions of multiorgan failure&#8211;this proportion being greater than expected from the SAPS 2 score&#46; Different authors<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;7</span></a> have underscored the predictive value of multiorgan failure in relation to mortality&#44; though it should be taken into account that most patients upon admission&#44; at least in our series&#44; already presented dysfunction of several organs&#46; In this sense&#44; our data coincide with the findings of a Spanish multicenter study<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> that analyzed the ventilatory support measures in hematological patients&#44; and in which the SOFA score was higher in those patients directly subjected to IMV versus the NPPV group&#44; and the initial respiratory SOFA score was similar in the IMV and NPPV &#40;success and failure&#41; groups&#8211;though in the NPPV failure group the score worsened significantly with respect to the rest of the patients over time&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">In our opinion&#44; NPPV has been a determinant factor in the reduction of mortality&#44; since as we have seen&#44; the number of complications and infections was not significantly greater in the IMV group &#40;mainly due to the brief stay in the ICU caused by early mortality&#41;&#8211;though all of them considered jointly&#44; together with the organ dysfunction already present at the time of admission&#44; probably influenced the final results obtained&#46; These results therefore reaffirm our opinion that whenever possible&#44; NPPV should be used for initial ventilatory support&#44; in concordance with the observations of most studies published to date&#44;<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#44;20&#8211;22</span></a> in which utilization of the technique has been associated with a high level of evidence&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a> Nevertheless&#44; recent studies<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;20&#44;22</span></a> continue to describe a greater use of IMV versus NPPV&#44; though these same publications<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">20&#44;22</span></a> have shown NPPV to afford a substantial decrease in mortality compared with IMV&#46; Another reason why our results are consistent with those obtained by other authors<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;11&#8211;13&#44;22&#44;24</span></a> could be the close collaboration between the Department of Hematology and our Department of Intensive Care Medicine&#44; thereby allowing earlier management of the many complications which these patients tend to present&#44; and which are difficult to deal with in a hospitalization ward&#46; The main element conditioning such close collaboration between our Departments was the introduction of NPPV in our range of therapeutic options&#46; The high mortality associated with the need for IMV<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1&#44;2&#44;6</span></a> raised some doubts about admitting such patients to our Unit&#44; in view of the important care burden involved &#40;respiratory support&#44; vasoactive and renal therapy in many cases&#44; and the adoption of isolation measures&#41;&#44; and the ominous outcomes&#46; But the introduction of NPPV and the publication of studies<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;11&#8211;13</span></a> warranting the use of this technique in immune depressed patients led to a substantial change in admission policy&#46; Another consideration was the rapid development and severity of organ dysfunction in these patients&#44; making it futile to admit such cases of established multiorgan failure to the ICU&#46; Early intervention with early admission thus proved essential&#46; In this same line&#44; some studies<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">25</span></a> point to the benefits in terms of lessened mortality of admitting patients with hematological malignancies to the ICU based on a less restrictive admission policy&#46; In this sense&#44; consideration is also required of the fact that a delay in admission to the ICU is directly correlated to mortality&#8211;thus advocating early patient admission&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p><p id="par0100" class="elsevierStylePara elsevierViewall">In this scenario favorable to NPPV&#44; doubts remain as to why the technique is still underused&#46; The reason could be the high incidence of ARDS upon admission or during patient stay in the ICU&#44; and the controversial indication of NPPV in ARDS&#46;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;26&#44;27</span></a> Different studies<a class="elsevierStyleCrossRefs" href="#bib0140"><span class="elsevierStyleSup">28&#44;29</span></a> have shown NPPV in hypoxemic patients to be more effective than oxygen therapy&#44; with particular emphasis upon ALI or ARDS<a class="elsevierStyleCrossRefs" href="#bib0150"><span class="elsevierStyleSup">30&#8211;32</span></a>&#8211;registering an NPPV failure rate of between 4&#46;8&#37;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a> and 70&#37; in ALI&#44;<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">31</span></a> and between 46&#37;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a> and 51&#37; in patients with ARDS&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a> The multivariate analysis<a class="elsevierStyleCrossRefs" href="#bib0140"><span class="elsevierStyleSup">28&#44;33</span></a> found the development of ARDS to be a predictor of NPPV failure&#8211;this possibly being the reason why there is no clear recommendation on the use of NPPV in the context of ARDS&#44;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#44;10&#44;25</span></a> and why the technique is little used in hematological patients with severe hypoxemia&#46; In contrast&#44; however&#44; the relationship between IMV and mortality in this patient population has been well established&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;5&#44;20&#8211;22</span></a> In this sense&#44; a multicenter observational study<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a> involving a series of 1302 hematological patients with ARF showed the use of NPPV to be less widespread than that of IMV &#40;21&#37; vs 79&#37;&#41;&#46; The noninvasive group presented more neutropenia &#40;16&#46;8&#37; vs 10&#37;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;002&#41; and hypoxemia than the invasive ventilation group&#46; In contrast&#44; the patients in the IMV group were in more serious condition as established by the APACHE score&#44; and had a poorer level of consciousness&#46; This may have justified the initial use of IMV&#46; A significant difference was also noted in the use of NPPV versus IMV in patients with ALI &#40;21&#37; vs 11&#37;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;0001&#41;&#46; In the case of patients with ARDS&#44; the difference failed to reach statistical significance&#46; The results showed the NPPV group to have a shorter duration of mechanical ventilation and stay in the ICU&#44; as well as lesser mortality both in the ICU and in hospital&#44; but these results were not reproduced in the subgroup of patients with ALI or ARDS&#46; Another observational study<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> found mortality after 30 days in the NPPV group to be significantly lower than in the IMV group &#40;43&#46;7&#37; vs 70&#46;8&#37;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;008&#41;&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall">On analyzing the NPPV group&#44; failure of the technique was seen to be associated with a greater complications rate&#46; These results coincide with those obtained in other studies&#44;<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">20&#44;22&#44;24&#44;30</span></a> where the failure of NPPV markedly increased the percentage of complications&#44; the duration of stay&#44; and mortality&#46; In coincidence with other authors&#44;<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">20&#44;22&#44;27&#44;28</span></a> we found mortality to be associated with failure of NPPV and development of ARDS&#44; along with other variables<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">20&#44;22</span></a> such as age&#44; septic shock&#44; coma&#44; coagulation disorders or a high SAPS 2 score&#44; which were not analyzed in our series&#46; Given the strong negative influence of NPPV failure upon mortality&#44; it seems logical to explore the factors that influence such failure&#46; In this context&#44; different studies<a class="elsevierStyleCrossRefs" href="#bib0120"><span class="elsevierStyleSup">24&#44;28</span></a> have identified delayed introduction of ventilatory support&#44; the development of ARDS&#44; and the need for vasoactive and renal support as predictors of NPPV failure&#46; Another cohort study of patients with ARDS<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">30</span></a> found severity as determined by a SAPS 2 score of &#62;34&#44; and the absence of improvement in oxygenation &#40;PaO<span class="elsevierStyleInf">2</span>&#47;FiO<span class="elsevierStyleInf">2</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>175&#41; 60<span class="elsevierStyleHsp" style=""></span>min after starting NPPV&#44; to be predictors of failure&#46; From the above it can be concluded that NPPV will probably fail if the start of the technique is delayed in a hypoxemic patient with scant clinical and blood gas response after 1<span class="elsevierStyleHsp" style=""></span>h&#8211;intubation being required in such cases&#46;</p><p id="par0110" class="elsevierStylePara elsevierViewall">The limitations of our study are represented by its retrospective nature&#44; and the fact that it was carried out in a single center where NPPV moreover is routine practice in patients with hypoxemic ARF&#46;</p><p id="par0115" class="elsevierStylePara elsevierViewall">Despite the poor results obtained in the IMV group&#44; we do not intend to discard the use of the technique&#46; Rather&#44; we wish to underscore the benefits of NPPV in extremely ill patients&#44; with a poor prognosis and with multiple organ dysfunction&#46; The routine use of NPPV&#44; and the risk of intubation particularly in these patients&#44; implies that the few individuals directly included in the IMV group were in a condition in which NPPV was literally contraindicated&#46; The conduction of a prospective study comparing NPPV versus IMV with a literature basis<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;5&#44;7</span></a> demonstrating the mortality associated to IMV&#44; along with studies<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;22</span></a> showing the good results obtained with NPPV&#44; therefore would be very questionable&#46; Consequently&#44; on the basis of our results&#44; we could recommend the use of NPPV as a first ventilatory support measure in hematological patients with ARF&#44; without considering the classical NPPV indication criteria&#44;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;26&#44;27</span></a> and without regarding ARDS or multiorgan dysfunction as exclusion criteria&#8211;since at the time of admission to the ICU&#44; most of these patients already suffer dysfunction of one or more organ systems&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0135">Conflicts of interest</span><p id="par0120" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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          "titulo" => "Keywords"
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          "palabras" => array:5 [
            0 => "Hematological malignancy"
            1 => "Noninvasive positive pressure ventilation"
            2 => "Pneumonia"
            3 => "Invasive mechanical ventilation"
            4 => "Acute respiratory failure"
          ]
        ]
      ]
      "es" => array:1 [
        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "Palabras clave"
          "identificador" => "xpalclavsec279512"
          "palabras" => array:5 [
            0 => "Enfermedad hematol&#243;gica"
            1 => "Ventilaci&#243;n mec&#225;nica no invasiva"
            2 => "Neumon&#237;a"
            3 => "Ventilaci&#243;n mec&#225;nica invasiva"
            4 => "Insuficiencia respiratoria aguda"
          ]
        ]
      ]
    ]
    "tieneResumen" => true
    "resumen" => array:2 [
      "en" => array:2 [
        "titulo" => "Abstract"
        "resumen" => "<span class="elsevierStyleSectionTitle" id="sect0010">Objective</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">A comparison was made between invasive mechanical ventilation &#40;IMV&#41; and noninvasive positive pressure ventilation &#40;NPPV&#41; in hematological patients with acute respiratory failure&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0015">Design</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">A retrospective observational study was made from 2001 to December 2011&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0020">Setting</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">A clinical&#8211;surgical intensive care unit &#40;ICU&#41; in a tertiary hospital&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0025">Patients</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Patients with hematological malignancies suffering acute respiratory failure &#40;ARF&#41; and requiring mechanical ventilation in the form of either IMV or NPPV&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0030">Variables of interest</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Analysis of infection and organ failure rates&#44; duration of mechanical ventilation and ICU and hospital stays&#44; as well as ICU&#44; hospital and mortality after 90 days&#46; The same variables were analyzed in the comparison between NPPV success and failure&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0035">Results</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Forty-one patients were included&#44; of which 35 required IMV and 6 NPPV&#46; ICU mortality was higher in the IMV group &#40;100&#37; vs 37&#37; in NPPV&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>&#46;006&#41;&#46; The intubation rate in NPPV was 40&#37;&#46; Compared with successful NPPV&#44; failure in the NPPV group involved more complications&#44; a longer duration of mechanical ventilation and ICU stay&#44; and greater ICU and hospital mortality&#46; Multivariate analysis of mortality in the NPPV group identified NPPV failure &#40;OR 13 &#91;95&#37; CI 1&#46;33&#8211;77&#46;96&#93;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>&#46;008&#41; and progression to acute respiratory distress syndrome &#40;OR 10 &#91;95&#37; CI 1&#46;95&#8211;89&#46;22&#93;&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>&#46;03&#41; as prognostic factors&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0040">Conclusion</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">The use of NPPV reduced mortality compared with IMV&#46; NPPV failure was associated with more complications&#46;</p>"
      ]
      "es" => array:2 [
        "titulo" => "Resumen"
        "resumen" => "<span class="elsevierStyleSectionTitle" id="sect0050">Objetivo</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Comparaci&#243;n de la ventilaci&#243;n mec&#225;nica invasiva &#40;VMI&#41; frente a la no invasiva &#40;VMNI&#41; en pacientes hematol&#243;gicos que desarrollaron insuficiencia respiratoria aguda &#40;IRA&#41;&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0055">Dise&#241;o</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Estudio observacional retrospectivo desde 2001 y hasta diciembre de 2011&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0060">&#193;mbito</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Unidad de cuidados intensivos &#40;UCI&#41; m&#233;dico-quir&#250;rgica de un hospital de tercer nivel&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0065">Pacientes</span><p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">Aquellos con patolog&#237;a hematol&#243;gica con IRA y que precisaron ventilaci&#243;n mec&#225;nica &#40;VM&#41;&#44; tanto VMI como VMNI&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0070">Variables de inter&#233;s</span><p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">N&#250;mero de infeccciones y fracaso de &#243;rganos&#44; duraci&#243;n de VM y estancias en la unidad y hospitalaria&#44; as&#237; como mortalidad en UCI&#44; hospitalaria y a los 90 d&#237;as&#46; En el subgrupo de VMNI se compar&#243; &#233;xito y fracaso en cuanto a las variables mencionadas&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0075">Resultados</span><p id="spar0065" class="elsevierStyleSimplePara elsevierViewall">Se incluyeron 41 pacientes que precisaron VM&#44; 35 con VMNI y 6 con VMI&#46; La mortalidad en UCI fue superior en VMI &#40;100 vs 37&#37; en VMNI&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;006&#41;&#46; El porcentaje de intubaci&#243;n en VMNI fue del 40&#37;&#46; El grupo fracaso de VMNI present&#243; mayor tasa de complicaciones&#44; mayor duraci&#243;n de la VM&#44; mayor estancia en UCI&#44; as&#237; como de mortalidad en UCI y hospitalaria que el grupo que no precis&#243; intubaci&#243;n&#46; El an&#225;lisis multivariante de mortalidad en el grupo VMNI estaba relacionada con el fracaso de la VMNI &#40;OR 13 &#91;IC 95&#37; 1&#44;33&#8211;77&#44;96&#93;&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;008&#41; y el desarrollo de s&#237;ndrome de distr&#233;s respiratorio del adulto &#40;OR 10 &#91;IC 95&#37; 1&#44;95&#8211;89&#44;22&#93;&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;03&#41;&#46;</p> <span class="elsevierStyleSectionTitle" id="sect0080">Conclusi&#243;n</span><p id="spar0070" class="elsevierStyleSimplePara elsevierViewall">La utilizaci&#243;n de VMNI redujo la mortalidad en comparaci&#243;n con la VMI&#46; El fracaso de la VMNI llev&#243; aparejada una mayor tasa de complicaciones&#46;</p>"
      ]
    ]
    "NotaPie" => array:1 [
      0 => array:2 [
        "etiqueta" => "&#9734;"
        "nota" => "<p class="elsevierStyleNotepara" id="npar0070">Please cite this article as&#58; Belenguer-Muncharaz A&#44; Albert-Rodrigo L&#44; Ferrandiz-Sell&#233;s A&#44; Cebri&#225;n-Graullera G&#46; Evoluci&#243;n de 10 a&#241;os de aplicaci&#243;n de la ventilaci&#243;n mec&#225;nica en la insuficiencia respiratoria aguda del paciente hematol&#243;gico ingresado en la unidad de cuidados intensivos&#46; Med Intensiva&#46; 2013&#59;37&#58;452&#8211;460&#46;</p>"
      ]
    ]
    "multimedia" => array:4 [
      0 => array:7 [
        "identificador" => "fig0005"
        "etiqueta" => "Figure 1"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr1.jpeg"
            "Alto" => 2106
            "Ancho" => 2918
            "Tamanyo" => 200270
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        ]
        "descripcion" => array:1 [
          "en" => "<p id="spar0075" class="elsevierStyleSimplePara elsevierViewall">Kaplan&#8211;Meier survival analysis &#40;log-rank test&#41; between the NPPV group &#40;success and failure&#41; and the IMV group after 90 days&#46; Table&#58; number of patients alive during this period of time&#46; IMV&#44; invasive mechanical ventilation&#59; NPPV&#44; noninvasive positive pressure ventilation&#59; NPPV OTI&#44; intubated noninvasive ventilation&#59; NPPV-NO OTI&#44; non-intubated noninvasive ventilation&#46;</p>"
        ]
      ]
      1 => array:7 [
        "identificador" => "tbl0005"
        "etiqueta" => "Table 1"
        "tipo" => "MULTIMEDIATABLA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "tabla" => array:3 [
          "leyenda" => "<p id="spar0085" class="elsevierStyleSimplePara elsevierViewall">CPAP&#44; continuous positive airway pressure&#59; COPD&#44; chronic obstructive pulmonary disease&#59; ARF&#44; acute respiratory failure&#59; SAPS 2&#44; Simplified Acute Physiology Score &#40;range 0&#8211;56&#41;&#59; SOFA&#44; Sequential Organ Failure Assessment&#59; TRALI&#44; transfusion-related acute lung injury&#59; ICU&#44; Intensive Care Unit&#59; IMV&#44; invasive mechanical ventilation&#59; NPPV&#44; noninvasive positive pressure ventilation&#46;</p>"
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                  \t\t\t\t"><span class="elsevierStyleItalic">SOFA</span><a class="elsevierStyleCrossRef" href="#tblfn0005"><span class="elsevierStyleSup">a</span></a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">SAPS 2 &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">Origin of patients&#44; n &#40;&#37;&#41;</span></td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Operating room&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Arterial hypertension&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Congestive heart failure&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Diabetes mellitus&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Previous cancer<a class="elsevierStyleCrossRef" href="#tblfn0020"><span class="elsevierStyleSup">d</span></a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Smoking&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Chronic renal failure&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">Neutropenia&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">Type of hematological disease</span></td><td class="td" title="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Acute leukemia&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Non-Hodgkin lymphoma&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Multiple myeloma&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Others<a class="elsevierStyleCrossRef" href="#tblfn0025"><span class="elsevierStyleSup">e</span></a>&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">Cause of acute respiratory failure</span>&#44; n &#40;&#37;&#41;</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Acute lung edema&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Postoperative ARF&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>TRALI&nbsp;\t\t\t\t\t\t\n
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          "leyenda" => "<p id="spar0095" class="elsevierStyleSimplePara elsevierViewall">ARDS&#44; adult respiratory distress syndrome&#59; ICU&#44; Intensive Care Unit&#59; IMV&#44; invasive mechanical ventilation&#59; NPPV&#44; noninvasive positive pressure ventilation&#59; VAP&#44; ventilator associated pneumonia&#46;</p>"
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                  \t\t\t\t" style="border-bottom: 2px solid black">NPPV &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>35&#41;</td><td class="td" title="\n
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                  \t\t\t\t">IMV &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>6&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">p</span><a class="elsevierStyleCrossRef" href="#tblfn0050"><span class="elsevierStyleSup">&#42;</span></a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">SuccessNPPV&#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>21&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleBold">VAP&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Secondary bacteremia</span><a class="elsevierStyleCrossRef" href="#tblfn0060"><span class="elsevierStyleSup">a</span></a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Hepatic</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">3 &#40;14&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">5 &#40;36&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Neurological</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">4 &#40;11&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">2 &#40;9&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">2 &#40;14&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1&#46;000&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">2 &#40;33&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;169&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="7" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Cardiac arrest&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">3 &#40;8&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">3 &#40;21&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;056&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">2 &#40;33&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Barotrauma&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">2 &#40;6&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">1&#46;000&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Tracheostomy&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Duration mechanical ventilation</span><a class="elsevierStyleCrossRef" href="#tblfn0065"><span class="elsevierStyleSup">b</span></a>&#44; <span class="elsevierStyleBold">days</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">8<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>9&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">4<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">13<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>12&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;016&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">3<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Stay in ICU</span><a class="elsevierStyleCrossRef" href="#tblfn0065"><span class="elsevierStyleSup">b</span></a>&#44; <span class="elsevierStyleBold">days</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">11<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>11&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">18<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>15&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;025&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>10&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;190&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Stay in hospital</span><a class="elsevierStyleCrossRef" href="#tblfn0065"><span class="elsevierStyleSup">b</span></a>&#44; <span class="elsevierStyleBold">days</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">33<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>19&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">32<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>21&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;800&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">26<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>26&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;554&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="7" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Mortality in ICU&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">13 &#40;37&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">3 &#40;14&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">10 &#40;71&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">6 &#40;100&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">0&#46;006&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Causes of death</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Multiorgan failure&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">2&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Cardiac arrest&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Cerebral hemorrhage&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Refractory hypoxemia&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="7" align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Mortality in hospital&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">16 &#40;46&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">6 &#40;28&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">10 &#40;71&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;018&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">6 &#40;100&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;023&nbsp;\t\t\t\t\t\t\n
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              "nota" => "<p class="elsevierStyleNotepara" id="npar0060">Secondary bacteremia foci&#58; pulmonary &#40;2 cases&#41;&#44; urinary &#40;3 cases&#41;&#44; abdominal &#40;1 case&#41; and blood product bag infection by <span class="elsevierStyleItalic">Klebsiella oxytoca</span> &#40;1 case&#41;&#46;</p>"
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          "leyenda" => "<p id="spar0105" class="elsevierStyleSimplePara elsevierViewall">95&#37; CI&#44; 95&#37; confidence interval&#59; CRA&#44; cardiorespiratory arrest&#59; ARDS&#44; adult respiratory distress syndrome&#59; NPPV&#44; noninvasive positive pressure ventilation&#46;</p>"
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                  \t\t\t\t" style="border-bottom: 2px solid black">NPPV survivors &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>22&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">Odds ratio&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">95&#37; CI&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">p</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">6 &#40;46&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;236&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">Failure NPPV&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">10 &#40;77&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">13&#46;2&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">1&#46;33 &#8211; 77&#46;96&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;008&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">Hemodynamic failure&#44; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">11 &#40;50&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">11 &#40;84&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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Original language: English
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Idiomas
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