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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 acute respiratory distress syndrome &#40;ARDS&#41; represents a well-known public health problem that was reported in 190&#44;600 cases each year in the United States and to be associated with 74&#44;500 deaths and 3&#46;6 million hospital days&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">1</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Despite advances in ARDS management&#44; mortality rates remain high<a class="elsevierStyleCrossRefs" href="#bib0225"><span class="elsevierStyleSup">1&#44;2</span></a> especially if associated with diffuse alveolar damage &#40;DAD&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0235"><span class="elsevierStyleSup">3</span></a> Patients who even survive ARDS are at risk of diminished functional capacity&#44; mental illness&#44; and decreased quality of life&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">4</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">Until now&#44; there are limited specific therapeutic options for ARDS&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">5</span></a> This lack of effective management strategies had directed the research to early identify patients at risk for the evaluation of preventive strategies before ARDS development&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">6</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Early recognition of patients at high risk of ARDS is a prerequisite for conduction of these prevention studies&#46; In the attempts for identifying patients at risk for ARDS&#44; many investigators had derived and validated a lung injury prediction scores &#40;LIPS&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0255"><span class="elsevierStyleSup">7&#44;8</span></a> Despite using similar risk factors and risk modifiers&#44; LIPS scores derived by Cartin-Ceba et al&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">7</span></a> and by Trillo-Alvarez et al&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">8</span></a> used different weights for every risk factors and risk modifiers present in the enrolled patients&#46; Both scores were seen to be significantly higher in patients who subsequently develop ARDS&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">Most of studies that evaluated these scores involved ED and ward patients with very low incidence of developing ARDS&#46;<a class="elsevierStyleCrossRefs" href="#bib0255"><span class="elsevierStyleSup">7&#44;9&#44;10</span></a> Patients admitted to the ICU with higher APACHE-II scores had higher incidence of developing ARDS&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">10</span></a> Identifying patients at risk of ARDS development from those critically ill patients might help in structuring preventive studies&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">This study was intended to validate and compare between two different lung injury prediction scores in predicting the occurrence of ARDS in high risk ICU patients and to improve the score accuracy by involving the serum CRP level&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Patients and methods</span><p id="par0035" class="elsevierStylePara elsevierViewall">This study was done as a prospective observational cohort study including all patients older than 18 years old who were admitted to critical care department at AL-Haram hospital&#44; Egypt with APACHE-II score &#8805;15 and at least one of the predisposing risk factors or risk modifiers of ARDS within 6<span class="elsevierStyleHsp" style=""></span>h from ICU admission during the period from January 2016 to May 2017&#46; We used standardized definitions for the risk factors &#40;Sepsis&#44;<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">11</span></a> Shock&#44;<a class="elsevierStyleCrossRef" href="#bib0280"><span class="elsevierStyleSup">12</span></a> shock index&#44;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">13</span></a> High risk trauma&#44;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">14</span></a> Pneumonia&#44;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">14</span></a> Aspiration&#44;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">14</span></a> Pancreatitis&#44;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">15</span></a> and high risk surgery<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">16</span></a>&#41; and risk modifiers &#40;alcohol abuse&#44;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">17</span></a> smoking&#44;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">17</span></a> hypoalbuminemia&#44;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">14</span></a> Diabetes&#44;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">18</span></a> Chemotherapy use&#44;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">19</span></a> Interstitial lung disease &#40;ILD&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">20</span></a> and tachypnoea<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">14</span></a>&#41;&#46; Patients with ARDS on admission&#44; supposed cardiac cause for hypoxemia&#44; and those with hospital readmission &#40;within 7 days&#41; were excluded from the study&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">All included patients were subjected to complete history taking and clinical examination with special emphasis on risk factors and risk modifiers of ARDS&#44; routine laboratory investigations included&#58; complete blood count &#40;CBC&#41;&#44; serum sodium&#44; serum potassium&#44; serum creatinine&#44; blood urea&#44; random blood sugar&#44; total protein&#44; serum albumin&#44; serum bilirubin&#44; Chest X-ray on admission&#44; every 24<span class="elsevierStyleHsp" style=""></span>h and when needed&#44; arterial blood gas analysis through direct arterial puncture or inserted arterial line for measurement of PaO<span class="elsevierStyleInf">2</span> to calculate &#40;PaO<span class="elsevierStyleInf">2</span>&#47;FiO<span class="elsevierStyleInf">2</span> ratio&#41;&#44; hemodynamic parameters including hourly monitoring of heart rate and non-invasive measurement of systolic and diastolic blood pressures &#40;SBP and DBP&#41; using bedside monitor&#46; The Shock index was calculated as heart rate&#47;systolic blood pressure&#46;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">13</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">Sampling for CRP levels on admission &#40;CRP-0&#41; and 48<span class="elsevierStyleHsp" style=""></span>h thereafter &#40;CRP-48&#41; were taken&#46; The change in CRP &#40;&#916;CRP&#41; was estimated as &#40;CRP-48<span class="elsevierStyleHsp" style=""></span>&#8722;<span class="elsevierStyleHsp" style=""></span>CRP-0&#41;&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">Six hours after admission&#44; LIPS was calculated according to two different calculation formulas that use different weights for the variables&#59; Cartin-Ceba et al&#46; &#40;2009&#41;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">7</span></a> that will be referred in the text as LIPS-2009 and Trillo-Alvarez et al&#46; &#40;2011&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">8</span></a> that will be referred as LIPS-2011&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">The outcome of interest was the development of ARDS according to Berlin definition &#40;2012&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0325"><span class="elsevierStyleSup">21</span></a> The development of ARDS was determined by two independent experts who were blinded to the LIPS scores&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">The study protocol was approved by the institutional review board at Cairo University together with representatives of study conduction site&#46; Informed consent was obtained from patients or first degree relative&#46;</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Statistical analysis</span><p id="par0065" class="elsevierStylePara elsevierViewall">Data were prospectively collected and coded using the statistical package of social science &#40;SPSS version 22&#41;&#46; Normal distribution of different dependent variables in relation to their independent variables was studied&#46; A variable was considered normally distributed if the Shapiro&#8211;Wilk&#39;s test had a <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#62;<span class="elsevierStyleHsp" style=""></span>0&#46;05<a class="elsevierStyleCrossRefs" href="#bib0330"><span class="elsevierStyleSup">22&#44;23</span></a> and <span class="elsevierStyleItalic">z</span>-value of skewness and kurtosis between &#8722;1&#46;96 and &#43;1&#46;96&#46;<a class="elsevierStyleCrossRef" href="#bib0340"><span class="elsevierStyleSup">24</span></a> Apart from LIPS-2011&#44; all other variables were non-normally distributed&#46; Continuous variables were accordingly expressed as median &#40;25th&#8211;75th&#41; percentiles &#91;Median &#40;<span class="elsevierStyleItalic">Q</span><span class="elsevierStyleInf">1</span>&#8211;<span class="elsevierStyleItalic">Q</span><span class="elsevierStyleInf">3</span>&#41;&#93;&#46; Categorical variables were expressed as frequency and proportion&#46; When two groups were studied&#44; non-parametric test &#40;Mann&#8211;Whitney <span class="elsevierStyleItalic">U</span> test&#41; was used for comparison between two groups as regard quantitative variables&#46; The confidence intervals of median difference across groups were derived by the Hodges&#8211;Lehmann estimate&#46; Chi-Square Test &#40;<span class="elsevierStyleItalic">x</span><span class="elsevierStyleSup">2</span>&#41; was used for comparison between two groups regarding qualitative data&#46; Exact test was used instead when the expected frequency is less than 5&#46; Receiver operator characteristic &#40;ROC&#41; analysis was performed to define a cut-off value of a variable&#46; We identified three cut-off values&#59; one with a 100&#37; sensitivity&#44; one with a 100&#37; specificity and the third with the best matched sensitivity and specificity according to the highest Youden index&#46; Comparisons between the different area under curves &#40;AUC&#41; were done using the <span class="elsevierStyleItalic">Z</span> statistics calculation according to DeLong et al&#46;<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">25</span></a> MedCalc Statistical Software version 18&#46;11 &#40;MedCalc Software bvba&#44; Ostend&#44; Belgium&#59; <a href="http://www.medcalc.org;/">http&#58;&#47;&#47;www&#46;medcalc&#46;org&#59;</a> 2018&#41; was used for its calculation as it cannot be calculated using the SPSS&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">New model was built using multivariate binary logistic regression analysis&#46; The model contained only LIPS-2011 and &#916;CRP which were associated with the ARDS prediction&#46; The strength of the association was measured as the odds ratio &#40;OR&#41; and the 95&#37; confidence interval &#40;CI&#41;&#46; The <span class="elsevierStyleItalic">&#946;</span>-coefficient of different variables was estimated to formulate an equation of a new score &#40;LIPS-N&#41; that included constant value added to the sum of the variables multiplied by their <span class="elsevierStyleItalic">&#946;</span>-coefficient&#46; The AUC for the new model was compared with the LIPS-2011 by the DeLong test&#46;<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">25</span></a> The regression model and the odds ratio of the LIPS-N derived by univariate regression were validated using bootstrapping of 1000 sample&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">Results were considered statistically significant if <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#8804;<span class="elsevierStyleHsp" style=""></span>0&#46;05&#46;</p></span></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Results</span><p id="par0080" class="elsevierStylePara elsevierViewall">We initially enrolled 280 patients in the study&#44; 80 were subsequently excluded&#59; 47 patients with cardiac cause of hypoxia&#44; 25 with ARDS on admission and 8 patients had a history of previous admission&#46; The remaining 200 patients represented the study population&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">Eighty-eight of the study population &#40;44&#37;&#41; developed ARDS during their ICU stay while 112 patients &#40;56&#37;&#41; did not develop ARDS&#46; ARDS developed after a median &#40;<span class="elsevierStyleItalic">Q</span><span class="elsevierStyleInf">1</span>&#8211;<span class="elsevierStyleItalic">Q</span><span class="elsevierStyleInf">3</span>&#41; of 2&#46;5 &#40;1&#46;3&#8211;6&#46;8&#41; days&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">The demographic data&#44; co-morbidities&#44; risk factors&#44; risk modifiers&#44; LIPS scores and CRP measures of our study are presented in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0095" class="elsevierStylePara elsevierViewall">The LIPS-2009&#44; LIPS-2011&#44; CRP-48 and &#916;CRP but not CRP-0 were found to be significantly higher in patients who developed ARDS compared to non-ARDS patients &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">ROC analysis was used to evaluate the predictive value of the LIPS scores and CRP-48 for the prediction of ARDS development&#46; The AUC was 0&#46;74 &#91;95&#37; CI&#58; 0&#46;67&#8211;0&#46;81&#41;&#93; for LIPS-2011 compared to 0&#46;738 &#91;95&#37; CI&#58; 0&#46;67&#8211;0&#46;81&#41;&#93; and 0&#46;730 &#91;95&#37; CI&#58; 0&#46;67&#8211;0&#46;8&#41;&#93; for LIPS-2009 and CRP-48 respectively&#46; These AUCs were statistically significant when compared to the AUC of 0&#46;5 &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;000 for the three AUCs&#41; while comparing those AUCs together revealed a non-significant difference &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;9&#44; 0&#46;9&#44; 0&#46;8 for pairwise comparison of different ROC curves&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; <a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a> shows the cut-off values of the different variables with their sensitivity&#44; specificity&#44; positive likelihood ratio &#40;LR&#43;&#41; and negative likelihood ratio &#40;LR&#8722;&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><p id="par0105" class="elsevierStylePara elsevierViewall">A multivariate binary logistic regression model involving the &#916;CRP and LIPS-2011 was studied&#46; The odds ratio &#40;95&#37; CI&#41; of LIPS-2011 was 1&#46;5 &#40;1&#46;3&#8211;1&#46;8&#41; and that of &#916; CRP was 1&#46;02 &#40;1&#8211;1&#46;02&#41;&#46; Using their <span class="elsevierStyleItalic">&#946;</span>-coefficient&#44; the following equation was derived&#58; &#8722;2&#46;416<span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span>&#40;0&#46;41<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>LIPS-2011&#41;<span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span>&#40;0&#46;016<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>&#916;CRP&#41;&#46; The new score was estimated according to this equation and was termed as LIPS-N&#46; The LIPS-N was 0&#46;31 &#40;&#8722;0&#46;37&#8211;1&#46;4&#41; in ARDS patients compared to &#8722;0&#46;99 &#40;&#8722;1&#46;7&#8211;0&#46;2&#41; in non-ARDS patients &#91;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;000&#44; 95&#37; CI for Hodges&#8211;Lehmann median difference &#8722;1&#46;4 &#40;&#8722;1&#46;8&#44;&#8722;1&#46;1&#41;&#93;&#46; We compared the new LIPS-N and LIPS-2011 scores using ROC analysis to evaluate their AUC&#46; The AUC of the LIPS-N was 0&#46;8 &#91;95&#37; CI &#40;0&#46;74&#8211;0&#46;86&#41;&#93; which is significantly higher than AUC of 0&#46;5 &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;000&#41;&#46; The AUC of LIPS-N was seen to be significantly higher than that of LIPS-2011 &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;01&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46; The cut-off of the LIPS-N and their sensitivity&#44; specificity&#44; LR&#43; and LR&#8722; are seen in <a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#46; The odds ratio &#40;95&#37; CI&#41; of patients with LIPS-N more than &#8722;0&#46;418 compared to those with less LIPS-N was 7&#46;989 &#40;4&#46;2&#8211;15&#46;3&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0115">Discussion</span><p id="par0110" class="elsevierStylePara elsevierViewall">We found in this study that the risk of progression to ARDS may be ascertained using the LIPS scores&#59; either derived by Cartin-Ceba et al&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">7</span></a> &#40;LIPS-2009&#41; or by Trillo-Alvarez et al&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">8</span></a> &#40;LIPS-2011&#41; early in the course of illness&#46; Both LIPS scores are significantly higher in patients who developed ARDS&#46; We evaluated the accuracy of the LIPS for predicting ARDS using ROC curve&#46; The AUC was 0&#46;740 for LIPS-2011 compared to 0&#46;738 for LIPS-2009 which is statistically insignificant&#46; LIPS-2011 score of 3&#46;5 was 75&#37; sensitive and 62&#37; specific for predicting ARDS while a LIPS-2009 score of 2 was found to have a sensitivity of 92&#37; and specificity of 53&#37;&#46; In their derivation cohort for the LIPS-2009&#44; Cartin-Ceba et al&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">7</span></a> found higher AUC of 0&#46;85 for predicting ARDS in a population of 1431 patients which is nearly similar to the AUC derived by Trillo-Alvarez and colleagues<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">8</span></a> which was 0&#46;84 in their retrospective derivation and prospective validation cohorts using the LIPS-2011 score with a cut-off value of 3 to have 69&#37; sensitive and 84&#37; specific&#46;</p><p id="par0115" class="elsevierStylePara elsevierViewall">In surgically ventilated patients&#44; Bauman et al&#46; found that LIPS is predictive for ARDS with AUC of 0&#46;79<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">26</span></a> with 50&#37; increase in the development of ARDS for every one-unit increase in LIPS&#46; They however&#44; used LIPS derived by Gajic et al&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">10</span></a> which we did not use in our study&#46; In their study on 5584 patients&#44; Gajic et al&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">10</span></a> derived their score on 2500 patients and validated it on the remaining 3084 patients&#46; They identified AUC for the LIPS of 0&#46;8 for predicting ARDS development in both the derivation and validation cohorts&#46; They identified an optimum cut-off value of 4 to be 69&#37; sensitive and 78&#37; specific&#46; Using this score in ICU patients&#44; Soto et al&#46;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">27</span></a> showed 31&#37; increase in the likelihood of ARDS development for every point increase in LIPS with AUC of 0&#46;7 which is close to ours&#59; with a cut-off value of 4 to be 90&#37; sensitive and 31&#37; specific&#46; Due to the higher mortality of ARDS patients with DAD&#44; Lorente et al&#46; derived a regression model including PaO<span class="elsevierStyleInf">2</span>&#47;FiO<span class="elsevierStyleInf">2</span> ratio&#44; dynamic compliance and age to predict DAD within ARDS patients&#46; The AUC for their model was 0&#46;74 in derivation cohort and 0&#46;73 in the validation cohort&#46;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">28</span></a></p><p id="par0120" class="elsevierStylePara elsevierViewall">The notion of using a biomarker reflecting the severity and course of alveolocapillary inflammation and increased permeability characterizing the ARDS is enthusiastic&#46; Theoretically&#44; the ideal biomarker would be involved in the disease pathogenesis&#44; easy to measure&#44; rapid results availability&#44; and highly sensitive and specific in predicting the required outcome&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">29</span></a> Many biomarkers related to DAD and its association with distal airway pathologic changes characterizing ARDS might be seen of value<a class="elsevierStyleCrossRefs" href="#bib0370"><span class="elsevierStyleSup">30&#44;31</span></a> and even&#44; too specific biomarker at the molecular level had been studied&#46;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">32</span></a> Many of these biomarkers are not commonly used in clinical practice&#46; Despite being non-specific&#44; C-reactive protein is a biomarker in common clinical use to delineate the activity of host inflammatory conditions such as sepsis&#44; cardiovascular disease and rheumatological disorders&#46;<a class="elsevierStyleCrossRef" href="#bib0385"><span class="elsevierStyleSup">33</span></a> Patients with sepsis-induced ARDS have elevated levels of CRP in both plasma and the broncho-alveolar lavage&#46;<a class="elsevierStyleCrossRef" href="#bib0390"><span class="elsevierStyleSup">34</span></a> We measured the admission and 48<span class="elsevierStyleHsp" style=""></span>h CRP levels in our study population&#46;</p><p id="par0125" class="elsevierStylePara elsevierViewall">In this study&#44; CRP-48 and the change of the CRP over the first 48<span class="elsevierStyleHsp" style=""></span>h following ICU admission were significantly higher in patients who developed ARDS&#46; CRP-48 had an AUC of 0&#46;730 for predicting patients who developed ARDS&#46; The CRP-48 of 48<span class="elsevierStyleHsp" style=""></span>mg&#47;L was seen to be 76&#37; sensitive and 62&#37; specific&#46; This was concordant with Zheng et al&#46;<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">35</span></a> who showed that the CRP can predict the occurrence of ARDS in trauma patients&#46; Contrary to these results&#44; In a study on community acquired pneumonia&#44; Lee et al&#46; concluded that the CRP does not predict patients who required mechanical ventilation and accordingly cannot predict ARDS development&#46;<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">36</span></a> Another study conducted by Komiya et al&#46; showed that the CRP had an AUC of 0&#46;831 for discriminating patients with ARDS compared to those with cardiogenic pulmonary edema and that this AUC was increased to 0&#46;931 when CRP was added to the brain natriuretic peptide&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">37</span></a> This study was however used in patients admitted by respiratory failure for the diagnosis rather than for predicting ARDS as we intended to evaluate&#46; Despite the specificity of 62&#37; that we had for CRP-48&#44; it is well-known that the CRP might be elevated in numerous inflammatory disorders and lack a specificity for the ARDS development&#46;<a class="elsevierStyleCrossRef" href="#bib0385"><span class="elsevierStyleSup">33</span></a></p><p id="par0130" class="elsevierStylePara elsevierViewall">We incorporated the &#916;CRP with the LIPS-2011 in a new score using binary logistic regression model forming the LIPS-N&#46; This score was estimated by the formula of &#91;&#8722;2&#46;416<span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span>&#40;0&#46;41<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>LIPS-2011&#41;<span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span>&#40;0&#46;016<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>&#916;CRP&#41;&#93;&#46; The AUC of this score was 0&#46;803 which was significantly higher than that of LIPS-2011 alone&#46; A result of this score of &#8722;0&#46;418 was found to be 78&#37; sensitive and 69&#37; specific for predicting ARDS&#46; This score however needs to be validated in another sample&#46;</p><p id="par0135" class="elsevierStylePara elsevierViewall">It is important to mention that the incidence of ARDS in this study was very high &#40;44&#37;&#41; compared to other previous studies where the incidence did not exceed 20&#37;<a class="elsevierStyleCrossRefs" href="#bib0260"><span class="elsevierStyleSup">8&#44;38&#8211;40</span></a> and this could be due to using a sample population with APACHE-II score &#8805;15 representing high risk population who are admitted to the ICU rather than ED or ward admission&#46; In Trillo-Alvarez&#39;s study&#44;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">8</span></a> they found ARDS incidence to be 17&#37; in their retrospective derivation cohort of ICU patients compared to 7&#37; in the prospective validation cohort of all hospitalized patients&#46;</p><p id="par0140" class="elsevierStylePara elsevierViewall">Both previously derived LIPS scores were seen to be similarly functioning in terms of ARDS prediction&#46; Both include readily available clinical information known to be associated with ARDS&#46; They identify at-risk patients early during illness with fair sensitivity and specificity&#46; Accordingly&#44; both may be beneficial for segregating subsets of high-risk patients for enrollment in prevention strategies&#46; Adding biomarker may&#44; however&#44; improve the score accuracy&#46;</p><p id="par0145" class="elsevierStylePara elsevierViewall">The lack of optimum sensitivity and specificity of these scores might be attributed to the absence of some well-known risk modifiers for ARDS&#59; large volume transfusion of packed red blood cells and fluid balance are examples of these risk modifiers that was seen by many investigators to affect ARDS risk&#46;<a class="elsevierStyleCrossRefs" href="#bib0290"><span class="elsevierStyleSup">14&#44;41</span></a> The predictive value of these scoring systems could be accordingly improved using more additional variables including more risk modifiers in all patients&#46; In addition&#44; the exposure to risk factors and risk modifiers is a dynamic process that might develop during the hospital course rather than on admission and so&#44; any predictive tool needs to be dynamic on daily bases&#46; Adding more additional information and data that are unavailable on admission might however affect the simplicity of using these scores in real practice&#46;</p><p id="par0150" class="elsevierStylePara elsevierViewall">Our study is limited by the relatively small sample size that used for the validation of the LIPS and that it is a single center study&#46; We recruited high risk ICU patients with high APACH-II score having higher incidence of ARDS that may explain the needed smaller sample&#46; One of the important factors that should be considered during planning for a preventive study for ARDS is that many of those patients expose to their risk factors prior to their ICU admission&#46; Despite being more difficult&#44; the enrollment of all hospitalized patients might be more practical&#44; yet the authors intended here to validate the LIPS scores in the more critically ICU patients&#46; One of the draw-backs of this study is the validation of the new score derived from the study on the same study sample&#46; The LIPS-N score should be validated in another ICU patients&#8217; sample&#46; The authors used bootstrapping for validation of the regression model&#46;</p><p id="par0155" class="elsevierStylePara elsevierViewall">Despite that the Berlin definition represents the gold standard for ARDS diagnosis&#44; many of its items&#44; like interpretation of portable chest X-ray&#44; remain clinician dependent&#46; Some authors concluded limited experts&#8217; ability to accurately differentiate between ARDS and other causes of respiratory failure&#46;<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">42</span></a> On the histopathologic level&#44; many of the clinically diagnosed ARDS patients showed subsequently normal lung after open lung biopsy or autopsy&#46;<a class="elsevierStyleCrossRefs" href="#bib0360"><span class="elsevierStyleSup">28&#44;43&#44;44</span></a> Finally&#44; many scores with different weighting power for the risk factors are established that limit the ability to compare different studies&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0120">Conclusions</span><p id="par0160" class="elsevierStylePara elsevierViewall">This study concludes that both LIPS scores derived by Cartin-Ceba et al&#46; on 2009 and Trillo-Alvarez et al&#46; on 2011 are equally effective in predicting ARDS in risky ICU patients&#46; The incorporation of change of CRP over the first 48<span class="elsevierStyleHsp" style=""></span>h of ICU admission with the LIPS-2011 score may increase its accuracy in ARDS prediction&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0125">Funding</span><p id="par0165" class="elsevierStylePara elsevierViewall">The study is self-funded&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0130">Author&#39;s contribution</span><p id="par0170" class="elsevierStylePara elsevierViewall">Concept&#58; MEHA&#44; KMT&#44; SF&#44; GH&#46;</p><p id="par0175" class="elsevierStylePara elsevierViewall">Design&#58; MEHA&#44; KMT&#44; GH&#46;</p><p id="par0180" class="elsevierStylePara elsevierViewall">Definition of intellectual content&#58; KMT&#44; SF&#44; GH&#46;</p><p id="par0185" class="elsevierStylePara elsevierViewall">Literature search&#58; MEHA&#44; KMT&#46;</p><p id="par0190" class="elsevierStylePara elsevierViewall">Data acquisition&#58; MEHA&#44; SF&#46;</p><p id="par0195" class="elsevierStylePara elsevierViewall">Data analysis and statistical analysis&#58; KMT&#46;</p><p id="par0200" class="elsevierStylePara elsevierViewall">Manuscript preparation&#58; KMT&#46;</p><p id="par0205" class="elsevierStylePara elsevierViewall">Manuscript editing&#58; KMT&#46;</p><p id="par0210" class="elsevierStylePara elsevierViewall">Manuscript review&#58; SF&#44; GH&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0135">Conflict of interest</span><p id="par0215" class="elsevierStylePara elsevierViewall">The authors do not have a conflict of interest to declare&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Objective</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">A study was made to validate two previously derived lung injury prediction scores &#40;LIPS&#41; for the prediction of acute respiratory distress syndrome &#40;ARDS&#41; in high risk intensive care patients&#44; with the incorporation of C-reactive protein &#40;CRP&#41; for improving score accuracy&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Design</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">A prospective&#44; observational cohort study was carried out&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Patients</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">A total of 200 patients with APACHE II score &#8805;15 and at least one ARDS risk factor upon ICU admission were included&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Interventions</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Calculation of LIPS using formulas developed by Cartin-Ceba et al&#46; &#40;2009&#41; and Trillo-Alvarez et al&#46; &#40;2011&#41; &#40;LIPS-2009 and LIPS-2011&#41;&#46; C-reactive protein was measured upon admission &#40;CRP-0&#41; and after 48<span class="elsevierStyleHsp" style=""></span>h &#40;CRP-48&#41;&#46;</p></span> <span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Main variables of interest</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Independent variables&#58; LIPS-2009&#44; LIPS-2011 and CRP values&#46; Dependent variable&#58; development of ARDS&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Results</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Eighty-eight patients &#40;44&#37;&#41; developed ARDS after a median &#40;<span class="elsevierStyleItalic">Q</span><span class="elsevierStyleInf">1</span>&#8211;<span class="elsevierStyleItalic">Q</span><span class="elsevierStyleInf">3</span>&#41; of 2&#46;5 &#40;1&#46;3&#8211;6&#46;8&#41; days&#46; The LIPS-2009 and LIPS-2011 scores were 4 &#40;3&#8211;6&#41; and 5 &#40;3&#46;6&#8211;6&#46;5&#41; in ARDS patients compared to 2 &#40;1&#8211;4&#41; and 3&#46;5 &#40;1&#46;5&#8211;4&#46;5&#41; in non-ARDS patients &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#46; CRP-48 was 96 &#40;67&#46;5&#8211;150&#46;3&#41;<span class="elsevierStyleHsp" style=""></span>mg&#47;L and 48 &#40;24&#8211;96&#41;<span class="elsevierStyleHsp" style=""></span>mg&#47;L in the two groups&#44; respectively &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#46; &#916;CRP &#40;i&#46;e&#46;&#44; CRP-48 minus CRP-0&#41; was significantly higher in the ARDS patients &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#46; The AUC was 0&#46;740 and 0&#46;738 for LIPS-2011 and LIPS-2009&#44; respectively &#8211; the difference being nonsignificant &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;9&#44; 0&#46;9 and 0&#46;8 for pairwise comparison of the different ROC curves&#41;&#46; Integrating &#916;CRP with LIPS-2011 using binary logistic regression analysis identified a new score &#40;LIPS-N&#41; with AUC 0&#46;803&#44; which was significantly higher than the AUC of LIPS-2011 &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;01&#41;&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Conclusions</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Both LIPS scores are equally effective in predicting ARDS in high risk ICU patients&#46; Integrating the change in CRP within the score might improve its accuracy&#46;</p></span>"
        "secciones" => array:7 [
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        "resumen" => "<span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Objetivo</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Se llev&#243; a cabo un estudio para validar 2 puntuaciones de predicci&#243;n de la lesi&#243;n pulmonar &#40;LIPS&#41; previamente obtenidas para la predicci&#243;n del s&#237;ndrome de dificultad respiratoria aguda &#40;SDRA&#41; en pacientes de alto riesgo ingresados en la unidad de cuidados intensivos&#44; con la incorporaci&#243;n de la prote&#237;na C reactiva &#40;PCR&#41; para aumentar la precisi&#243;n de la puntuaci&#243;n&#46;</p></span> <span id="abst0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Dise&#241;o</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Se llev&#243; a cabo un estudio prospectivo y observacional de cohortes&#46;</p></span> <span id="abst0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Pacientes</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Se incluy&#243; un total de 200 pacientes con una puntuaci&#243;n APACHE II<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>15 y al menos un factor de riesgo de SDRA en el momento de su ingreso en la UCI&#46;</p></span> <span id="abst0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Intervenciones</span><p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">Se calcularon las puntuaciones por medio de las f&#243;rmulas desarrolladas por Cartin-Ceba et al&#46; &#40;2009&#41; y Trillo-Alvarez et al&#46; &#40;2011&#41; &#40;LIPS-2009 y LIPS-2011&#41;&#46; La concentraci&#243;n de PCR se midi&#243; en el momento del ingreso &#40;PCR-0&#41; y al cabo de 48<span class="elsevierStyleHsp" style=""></span>horas &#40;PCR-48&#41;&#46;</p></span> <span id="abst0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Principales variables de inter&#233;s</span><p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">Variables independientes<span class="elsevierStyleUnderline">&#58;</span> LIPS-2009&#44; LIPS-2011 y valores de PCR&#46; Variable dependiente&#58; desarrollo de SDRA&#46;</p></span> <span id="abst0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Resultados</span><p id="spar0065" class="elsevierStyleSimplePara elsevierViewall">Ochenta y ocho pacientes &#40;44&#37;&#41; desarrollaron SDRA tras una mediana &#40;Q<span class="elsevierStyleInf">1</span>-Q<span class="elsevierStyleInf">3</span>&#41; de 2&#44;5 &#40;1&#44;3-6&#44;8&#41; d&#237;as&#46; Las puntuaciones LIPS-2009 y LIPS-2011 fueron 4 &#40;3-6&#41; y 5 &#40;3&#44;6-6&#44;5&#41; en los pacientes con SDRA&#44; frente a 2 &#40;1-4&#41; y 3&#44;5 &#40;1&#44;5-4&#44;5&#41; en pacientes sin SDRA &#40;p<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#44;001&#41;&#46; El valor de PCR-48 fue 96<span class="elsevierStyleHsp" style=""></span>mg&#47;l &#40;67&#44;5-150&#44;3&#41; y 48<span class="elsevierStyleHsp" style=""></span>mg&#47;l &#40;24-96&#41; en los 2 grupos respectivamente &#40;p<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#44;001&#41;&#46; &#916;PCR &#40;esto es&#44; RCR-48 menos PCR-0&#41; fue significativamente mayor en los pacientes con SDRA &#40;p<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#44;001&#41;&#46; El AUC fue 0&#44;740 y 0&#44;738 para LIPS-2011 y LIPS-2009 respectivamente y la diferencia no fue significativa &#40;p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;9&#44; 0&#44;9 y 0&#44;8 para la comparaci&#243;n por parejas de las distintas curvas ROC&#41;&#46; La integraci&#243;n de &#916;PCR con LIPS-2011 mediante un an&#225;lisis de regresi&#243;n log&#237;stica binaria identific&#243; una nueva puntuaci&#243;n &#40;LIPS-N&#41; con un AUC 0&#44;803&#44; el cual era significativamente mayor que el AUC de LIPS-2011 &#40;p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;01&#41;&#46;</p></span> <span id="abst0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Conclusiones</span><p id="spar0070" class="elsevierStyleSimplePara elsevierViewall">Ambas puntuaciones LIPS resultan igualmente eficaces en cuanto a la predicci&#243;n del SDRA en pacientes de alto riesgo ingresados en la UCI&#46; La integraci&#243;n en esta puntuaci&#243;n del cambio en la PCR podr&#237;a aumentar su precisi&#243;n&#46;</p></span>"
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            "titulo" => "Principales variables de inter&#233;s"
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                  \t\t\t\t">3 &#40;2&#46;7&#37;&#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;17&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Smoking &#91;No&#46; &#40;&#37;&#41;&#93;</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">80 &#40;40&#37;&#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">33 &#40;37&#46;5&#37;&#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">47 &#40;42&#37;&#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;31&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Hypoalbuminemia &#91;No&#46; &#40;&#37;&#41;&#93;</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">129 &#40;64&#46;5&#37;&#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">68 &#40;77&#46;3&#37;&#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">61 &#40;54&#46;5&#37;&#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"><span class="elsevierStyleBold">0&#46;001</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Diabetes &#91;No&#46; &#40;&#37;&#41;&#93;</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">82 &#40;41&#37;&#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">38 &#40;43&#46;2&#37;&#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">44 &#40;39&#46;3&#37;&#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;34&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Chemotherapy &#91;No&#46; &#40;&#37;&#41;&#93;</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">15 &#40;7&#46;5&#37;&#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">7 &#40;7&#46;9&#37;&#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">8 &#40;7&#46;1&#37;&#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;52&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Tachypnea &#91;No&#46; &#40;&#37;&#41;&#93;</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">76 &#40;38&#37;&#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">56 &#40;62&#46;9&#37;&#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">20 &#40;18&#37;&#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"><span class="elsevierStyleBold">&#60;0&#46;001</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Interstitial lung disease &#91;No&#46; &#40;&#37;&#41;&#93;</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">5 &#40;2&#46;5&#37;&#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">2 &#40;2&#46;3&#37;&#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">3 &#40;2&#46;7&#37;&#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;613&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="5" 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="5" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Risk factors</span></td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Sepsis &#91;No&#46; &#40;&#37;&#41;&#93;</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">99 &#40;49&#46;5&#37;&#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">56 &#40;63&#46;6&#37;&#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">43 &#40;38&#46;4&#37;&#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"><span class="elsevierStyleBold">&#60;0&#46;001</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">SBP &#40;mmHg&#41; &#91;&#40;median &#40;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">1</span></span><span class="elsevierStyleItalic">&#8211;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">3</span></span><span class="elsevierStyleItalic">&#41;&#93;</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">100 &#40;80&#8211;120&#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">90 &#40;73&#8211;120&#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">110 &#40;90&#8211;120&#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"><span class="elsevierStyleBold">0&#46;003</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">HR &#40;bpm&#41; &#91;&#40;median &#40;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">1</span></span><span class="elsevierStyleItalic">&#8211;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">3</span></span><span class="elsevierStyleItalic">&#41;&#93;</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">105 &#40;90&#8211;110&#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">110 &#40;100&#8211;120&#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">100 &#40;90&#8211;110&#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"><span class="elsevierStyleBold">&#60;0&#46;001</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Shock index &#91;&#40;median &#40;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">1</span></span><span class="elsevierStyleItalic">&#8211;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">3</span></span><span class="elsevierStyleItalic">&#41;&#93;</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">1 &#40;0&#46;8&#8211;1&#46;5&#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">1&#46;2 &#40;0&#46;9&#8211;1&#46;8&#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;9 &#40;0&#46;7&#8211;1&#46;2&#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"><span class="elsevierStyleBold">&#60;0&#46;001</span>&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="5" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Shock index score &#91;No&#46; &#40;&#37;&#41;&#93;</span></td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>&#60;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="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">108 &#40;54&#37;&#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">30 &#40;34&#46;1&#37;&#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">78 &#40;69&#46;6&#37;&#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  " rowspan="3" align="char" valign="middle">&#60;<span class="elsevierStyleBold">0&#46;001</span></td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>1&#8211;1&#46;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="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">50 &#40;25&#37;&#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">33 &#40;37&#46;5&#37;&#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">17 &#40;15&#46;2&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>&#62;1&#46;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="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">42 &#40;21&#37;&#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">25 &#40;28&#46;4&#37;&#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">17 &#40;15&#46;2&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">High risk trauma &#91;No&#46; &#40;&#37;&#41;&#93;</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">50 &#40;25&#37;&#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">23 &#40;26&#46;1&#37;&#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">27 &#40;24&#46;1&#37;&#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;42&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Pneumonia &#91;No&#46; &#40;&#37;&#41;&#93;</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">80 &#40;40&#37;&#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">47 &#40;53&#46;4&#37;&#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">33 &#40;29&#46;5&#37;&#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"><span class="elsevierStyleBold">0&#46;001</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Aspiration &#91;No&#46; &#40;&#37;&#41;&#93;</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">49 &#40;24&#46;5&#37;&#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">28 &#40;31&#46;8&#37;&#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">21 &#40;18&#46;8&#37;&#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"><span class="elsevierStyleBold">0&#46;02</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">Pancreatitis &#91;No&#46; &#40;&#37;&#41;&#93;</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">2 &#40;1&#37;&#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 &#40;0&#37;&#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">2 &#40;1&#46;8&#37;&#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;31&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="5" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">High risk surgery &#91;No&#46; &#40;&#37;&#41;&#93;</span></td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Elective&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">25 &#40;12&#46;5&#37;&#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">5 &#40;5&#46;7&#37;&#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">20 &#40;17&#46;9&#37;&#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  " rowspan="3" align="char" valign="middle"><span class="elsevierStyleBold">0&#46;03</span></td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Emergent&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">26 &#40;13&#37;&#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">14 &#40;15&#46;9&#37;&#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">12 &#40;10&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleHsp" style=""></span>Total&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">51 &#40;25&#46;5&#37;&#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">19 &#40;22&#37;&#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">32 &#40;28&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">LIPS-2009 &#91;&#40;median &#40;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">1</span></span><span class="elsevierStyleItalic">&#8211;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">3</span></span><span class="elsevierStyleItalic">&#41;&#93;</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">3 &#40;2&#8211;5&#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">4 &#40;3&#8211;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-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2 &#40;1&#8211;4&#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"><span class="elsevierStyleBold">&#60;0&#46;001</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">LIPS-2011 &#91;&#40;median &#40;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">1</span></span><span class="elsevierStyleItalic">&#8211;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">3</span></span><span class="elsevierStyleItalic">&#41;&#93;</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">4 &#40;2&#46;5&#8211;5&#46;5&#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">5 &#40;3&#46;6&#8211;6&#46;5&#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">3&#46;5 &#40;1&#46;5&#8211;4&#46;5&#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"><span class="elsevierStyleBold">&#60;0&#46;001</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">CRP-0&#44; mg&#47;L &#91;&#40;median &#40;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">1</span></span><span class="elsevierStyleItalic">&#8211;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">3</span></span><span class="elsevierStyleItalic">&#41;&#93;</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">48 &#40;24&#8211;48&#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">48 &#40;24&#8211;48&#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">48 &#40;24&#8211;48&#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;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">CRP-48&#44; mg&#47;L &#91;&#40;median &#40;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">1</span></span><span class="elsevierStyleItalic">&#8211;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">3</span></span><span class="elsevierStyleItalic">&#41;&#93;</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">96 &#40;48&#8211;96&#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">96 &#40;67&#46;5&#8211;150&#46;3&#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">48 &#40;24&#8211;96&#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"><span class="elsevierStyleBold">&#60;0&#46;001</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">&#916;CRP&#44; mg&#47;L &#91;&#40;median &#40;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">1</span></span><span class="elsevierStyleItalic">&#8211;Q</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">3</span></span><span class="elsevierStyleItalic">&#41;&#93;</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">24 &#40;0&#8211;61&#46;5&#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
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                  """
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                  \t\t\t\t">96&#46;8&#8211;100&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">LIPS-2011</td><td class="td" title="\n
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Vol. 44. Issue 5.
Pages 267-274 (June - July 2020)
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Vol. 44. Issue 5.
Pages 267-274 (June - July 2020)
Original article
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Lung injury prediction scores: Clinical validation and C-reactive protein involvement in high risk patients
Escalas de predicción de la lesión pulmonar: validación clínica e implicación de la proteína C reactiva en pacientes de alto riesgo
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M.E.-H. Ahmeda, G. Hamedb, S. Fawzyb, K.M. Taemab,
Corresponding author
Khaled.toaima@kasralainy.edu.eg

Corresponding author.
a Critical Care Medicine Department, Al-Haram Hospital, Cairo, Egypt
b Critical Care Medicine Department, Cairo University, Cairo, Egypt
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Tables (2)
Table 1. The demographic data, co-morbidities, risk factors, risk modifiers, LIPS scores and CRP measures in the study groups.
Table 2. The cut-off values of the different variables with their sensitivity, specificity, LR+, and LR−.
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Abstract
Objective

A study was made to validate two previously derived lung injury prediction scores (LIPS) for the prediction of acute respiratory distress syndrome (ARDS) in high risk intensive care patients, with the incorporation of C-reactive protein (CRP) for improving score accuracy.

Design

A prospective, observational cohort study was carried out.

Patients

A total of 200 patients with APACHE II score ≥15 and at least one ARDS risk factor upon ICU admission were included.

Interventions

Calculation of LIPS using formulas developed by Cartin-Ceba et al. (2009) and Trillo-Alvarez et al. (2011) (LIPS-2009 and LIPS-2011). C-reactive protein was measured upon admission (CRP-0) and after 48h (CRP-48).

Main variables of interest

Independent variables: LIPS-2009, LIPS-2011 and CRP values. Dependent variable: development of ARDS.

Results

Eighty-eight patients (44%) developed ARDS after a median (Q1Q3) of 2.5 (1.3–6.8) days. The LIPS-2009 and LIPS-2011 scores were 4 (3–6) and 5 (3.6–6.5) in ARDS patients compared to 2 (1–4) and 3.5 (1.5–4.5) in non-ARDS patients (p<0.001). CRP-48 was 96 (67.5–150.3)mg/L and 48 (24–96)mg/L in the two groups, respectively (p<0.001). ΔCRP (i.e., CRP-48 minus CRP-0) was significantly higher in the ARDS patients (p<0.001). The AUC was 0.740 and 0.738 for LIPS-2011 and LIPS-2009, respectively – the difference being nonsignificant (p=0.9, 0.9 and 0.8 for pairwise comparison of the different ROC curves). Integrating ΔCRP with LIPS-2011 using binary logistic regression analysis identified a new score (LIPS-N) with AUC 0.803, which was significantly higher than the AUC of LIPS-2011 (p=0.01).

Conclusions

Both LIPS scores are equally effective in predicting ARDS in high risk ICU patients. Integrating the change in CRP within the score might improve its accuracy.

Keywords:
ARDS
LIPS
Lung injury prediction score
ARDS prediction
Resumen
Objetivo

Se llevó a cabo un estudio para validar 2 puntuaciones de predicción de la lesión pulmonar (LIPS) previamente obtenidas para la predicción del síndrome de dificultad respiratoria aguda (SDRA) en pacientes de alto riesgo ingresados en la unidad de cuidados intensivos, con la incorporación de la proteína C reactiva (PCR) para aumentar la precisión de la puntuación.

Diseño

Se llevó a cabo un estudio prospectivo y observacional de cohortes.

Pacientes

Se incluyó un total de 200 pacientes con una puntuación APACHE II15 y al menos un factor de riesgo de SDRA en el momento de su ingreso en la UCI.

Intervenciones

Se calcularon las puntuaciones por medio de las fórmulas desarrolladas por Cartin-Ceba et al. (2009) y Trillo-Alvarez et al. (2011) (LIPS-2009 y LIPS-2011). La concentración de PCR se midió en el momento del ingreso (PCR-0) y al cabo de 48horas (PCR-48).

Principales variables de interés

Variables independientes: LIPS-2009, LIPS-2011 y valores de PCR. Variable dependiente: desarrollo de SDRA.

Resultados

Ochenta y ocho pacientes (44%) desarrollaron SDRA tras una mediana (Q1-Q3) de 2,5 (1,3-6,8) días. Las puntuaciones LIPS-2009 y LIPS-2011 fueron 4 (3-6) y 5 (3,6-6,5) en los pacientes con SDRA, frente a 2 (1-4) y 3,5 (1,5-4,5) en pacientes sin SDRA (p<0,001). El valor de PCR-48 fue 96mg/l (67,5-150,3) y 48mg/l (24-96) en los 2 grupos respectivamente (p<0,001). ΔPCR (esto es, RCR-48 menos PCR-0) fue significativamente mayor en los pacientes con SDRA (p<0,001). El AUC fue 0,740 y 0,738 para LIPS-2011 y LIPS-2009 respectivamente y la diferencia no fue significativa (p=0,9, 0,9 y 0,8 para la comparación por parejas de las distintas curvas ROC). La integración de ΔPCR con LIPS-2011 mediante un análisis de regresión logística binaria identificó una nueva puntuación (LIPS-N) con un AUC 0,803, el cual era significativamente mayor que el AUC de LIPS-2011 (p=0,01).

Conclusiones

Ambas puntuaciones LIPS resultan igualmente eficaces en cuanto a la predicción del SDRA en pacientes de alto riesgo ingresados en la UCI. La integración en esta puntuación del cambio en la PCR podría aumentar su precisión.

Palabras clave:
ARDS
LIPS
Puntaje de predicción de la lesión pulmonar
Predicción del ARDS
Full Text
Introduction

The acute respiratory distress syndrome (ARDS) represents a well-known public health problem that was reported in 190,600 cases each year in the United States and to be associated with 74,500 deaths and 3.6 million hospital days.1

Despite advances in ARDS management, mortality rates remain high1,2 especially if associated with diffuse alveolar damage (DAD).3 Patients who even survive ARDS are at risk of diminished functional capacity, mental illness, and decreased quality of life.4

Until now, there are limited specific therapeutic options for ARDS.5 This lack of effective management strategies had directed the research to early identify patients at risk for the evaluation of preventive strategies before ARDS development.6

Early recognition of patients at high risk of ARDS is a prerequisite for conduction of these prevention studies. In the attempts for identifying patients at risk for ARDS, many investigators had derived and validated a lung injury prediction scores (LIPS).7,8 Despite using similar risk factors and risk modifiers, LIPS scores derived by Cartin-Ceba et al.7 and by Trillo-Alvarez et al.8 used different weights for every risk factors and risk modifiers present in the enrolled patients. Both scores were seen to be significantly higher in patients who subsequently develop ARDS.

Most of studies that evaluated these scores involved ED and ward patients with very low incidence of developing ARDS.7,9,10 Patients admitted to the ICU with higher APACHE-II scores had higher incidence of developing ARDS.10 Identifying patients at risk of ARDS development from those critically ill patients might help in structuring preventive studies.

This study was intended to validate and compare between two different lung injury prediction scores in predicting the occurrence of ARDS in high risk ICU patients and to improve the score accuracy by involving the serum CRP level.

Patients and methods

This study was done as a prospective observational cohort study including all patients older than 18 years old who were admitted to critical care department at AL-Haram hospital, Egypt with APACHE-II score ≥15 and at least one of the predisposing risk factors or risk modifiers of ARDS within 6h from ICU admission during the period from January 2016 to May 2017. We used standardized definitions for the risk factors (Sepsis,11 Shock,12 shock index,13 High risk trauma,14 Pneumonia,14 Aspiration,14 Pancreatitis,15 and high risk surgery16) and risk modifiers (alcohol abuse,17 smoking,17 hypoalbuminemia,14 Diabetes,18 Chemotherapy use,19 Interstitial lung disease (ILD),20 and tachypnoea14). Patients with ARDS on admission, supposed cardiac cause for hypoxemia, and those with hospital readmission (within 7 days) were excluded from the study.

All included patients were subjected to complete history taking and clinical examination with special emphasis on risk factors and risk modifiers of ARDS, routine laboratory investigations included: complete blood count (CBC), serum sodium, serum potassium, serum creatinine, blood urea, random blood sugar, total protein, serum albumin, serum bilirubin, Chest X-ray on admission, every 24h and when needed, arterial blood gas analysis through direct arterial puncture or inserted arterial line for measurement of PaO2 to calculate (PaO2/FiO2 ratio), hemodynamic parameters including hourly monitoring of heart rate and non-invasive measurement of systolic and diastolic blood pressures (SBP and DBP) using bedside monitor. The Shock index was calculated as heart rate/systolic blood pressure.13

Sampling for CRP levels on admission (CRP-0) and 48h thereafter (CRP-48) were taken. The change in CRP (ΔCRP) was estimated as (CRP-48CRP-0).

Six hours after admission, LIPS was calculated according to two different calculation formulas that use different weights for the variables; Cartin-Ceba et al. (2009)7 that will be referred in the text as LIPS-2009 and Trillo-Alvarez et al. (2011),8 that will be referred as LIPS-2011.

The outcome of interest was the development of ARDS according to Berlin definition (2012).21 The development of ARDS was determined by two independent experts who were blinded to the LIPS scores.

The study protocol was approved by the institutional review board at Cairo University together with representatives of study conduction site. Informed consent was obtained from patients or first degree relative.

Statistical analysis

Data were prospectively collected and coded using the statistical package of social science (SPSS version 22). Normal distribution of different dependent variables in relation to their independent variables was studied. A variable was considered normally distributed if the Shapiro–Wilk's test had a p>0.0522,23 and z-value of skewness and kurtosis between −1.96 and +1.96.24 Apart from LIPS-2011, all other variables were non-normally distributed. Continuous variables were accordingly expressed as median (25th–75th) percentiles [Median (Q1Q3)]. Categorical variables were expressed as frequency and proportion. When two groups were studied, non-parametric test (Mann–Whitney U test) was used for comparison between two groups as regard quantitative variables. The confidence intervals of median difference across groups were derived by the Hodges–Lehmann estimate. Chi-Square Test (x2) was used for comparison between two groups regarding qualitative data. Exact test was used instead when the expected frequency is less than 5. Receiver operator characteristic (ROC) analysis was performed to define a cut-off value of a variable. We identified three cut-off values; one with a 100% sensitivity, one with a 100% specificity and the third with the best matched sensitivity and specificity according to the highest Youden index. Comparisons between the different area under curves (AUC) were done using the Z statistics calculation according to DeLong et al.25 MedCalc Statistical Software version 18.11 (MedCalc Software bvba, Ostend, Belgium; http://www.medcalc.org; 2018) was used for its calculation as it cannot be calculated using the SPSS.

New model was built using multivariate binary logistic regression analysis. The model contained only LIPS-2011 and ΔCRP which were associated with the ARDS prediction. The strength of the association was measured as the odds ratio (OR) and the 95% confidence interval (CI). The β-coefficient of different variables was estimated to formulate an equation of a new score (LIPS-N) that included constant value added to the sum of the variables multiplied by their β-coefficient. The AUC for the new model was compared with the LIPS-2011 by the DeLong test.25 The regression model and the odds ratio of the LIPS-N derived by univariate regression were validated using bootstrapping of 1000 sample.

Results were considered statistically significant if p0.05.

Results

We initially enrolled 280 patients in the study, 80 were subsequently excluded; 47 patients with cardiac cause of hypoxia, 25 with ARDS on admission and 8 patients had a history of previous admission. The remaining 200 patients represented the study population.

Eighty-eight of the study population (44%) developed ARDS during their ICU stay while 112 patients (56%) did not develop ARDS. ARDS developed after a median (Q1Q3) of 2.5 (1.3–6.8) days.

The demographic data, co-morbidities, risk factors, risk modifiers, LIPS scores and CRP measures of our study are presented in Table 1.

Table 1.

The demographic data, co-morbidities, risk factors, risk modifiers, LIPS scores and CRP measures in the study groups.

Risk factors and risk modifiers  The whole population(200 patients)  ARDS patients(88 patients)  Non-ARDS patients(112 patients)  p value 
Age (years old) [(median (Q1Q3)]  63 (43–70)  63 (44–70)  63 (43–70)  0.983 
Male gender [No. (%)]  120 (60%)  51 (58%)  69 (61.6%)  0.352 
APACHE II score [(median (Q1Q3)]  20 (18–24)  21 (18–24)  19 (18–22)  0.004 
Risk modifiers
Alcohol abuse [No. (%)]  3 (1.5%)  0 (0%)  3 (2.7%)  0.17 
Smoking [No. (%)]  80 (40%)  33 (37.5%)  47 (42%)  0.31 
Hypoalbuminemia [No. (%)]  129 (64.5%)  68 (77.3%)  61 (54.5%)  0.001 
Diabetes [No. (%)]  82 (41%)  38 (43.2%)  44 (39.3%)  0.34 
Chemotherapy [No. (%)]  15 (7.5%)  7 (7.9%)  8 (7.1%)  0.52 
Tachypnea [No. (%)]  76 (38%)  56 (62.9%)  20 (18%)  <0.001 
Interstitial lung disease [No. (%)]  5 (2.5%)  2 (2.3%)  3 (2.7%)  0.613 
Risk factors
Sepsis [No. (%)]  99 (49.5%)  56 (63.6%)  43 (38.4%)  <0.001 
SBP (mmHg) [(median (Q1–Q3)]  100 (80–120)  90 (73–120)  110 (90–120)  0.003 
HR (bpm) [(median (Q1–Q3)]  105 (90–110)  110 (100–120)  100 (90–110)  <0.001 
Shock index [(median (Q1–Q3)]  1 (0.8–1.5)  1.2 (0.9–1.8)  0.9 (0.7–1.2)  <0.001 
Shock index score [No. (%)]
<1  108 (54%)  30 (34.1%)  78 (69.6%)  <0.001
1–1.5  50 (25%)  33 (37.5%)  17 (15.2%) 
>1.5  42 (21%)  25 (28.4%)  17 (15.2%) 
High risk trauma [No. (%)]  50 (25%)  23 (26.1%)  27 (24.1%)  0.42 
Pneumonia [No. (%)]  80 (40%)  47 (53.4%)  33 (29.5%)  0.001 
Aspiration [No. (%)]  49 (24.5%)  28 (31.8%)  21 (18.8%)  0.02 
Pancreatitis [No. (%)]  2 (1%)  0 (0%)  2 (1.8%)  0.31 
High risk surgery [No. (%)]
Elective  25 (12.5%)  5 (5.7%)  20 (17.9%)  0.03
Emergent  26 (13%)  14 (15.9%)  12 (10.7%) 
Total  51 (25.5%)  19 (22%)  32 (28.6%) 
LIPS-2009 [(median (Q1–Q3)]  3 (2–5)  4 (3–6)  2 (1–4)  <0.001 
LIPS-2011 [(median (Q1–Q3)]  4 (2.5–5.5)  5 (3.6–6.5)  3.5 (1.5–4.5)  <0.001 
CRP-0, mg/L [(median (Q1–Q3)]  48 (24–48)  48 (24–48)  48 (24–48)  0.4 
CRP-48, mg/L [(median (Q1–Q3)]  96 (48–96)  96 (67.5–150.3)  48 (24–96)  <0.001 
ΔCRP, mg/L [(median (Q1–Q3)]  24 (0–61.5)  48 (19.5–83.5)  0 (0–48)  <0.001 

SBP: systolic blood pressure, HR: heart rate, LIPS: lung injury prediction score, CRP-0: C-reactive protein on admission, CRP-48: C-reactive protein 48h after admission, ΔCRP: CRP-48CRP-0.

The LIPS-2009, LIPS-2011, CRP-48 and ΔCRP but not CRP-0 were found to be significantly higher in patients who developed ARDS compared to non-ARDS patients (Table 1).

ROC analysis was used to evaluate the predictive value of the LIPS scores and CRP-48 for the prediction of ARDS development. The AUC was 0.74 [95% CI: 0.67–0.81)] for LIPS-2011 compared to 0.738 [95% CI: 0.67–0.81)] and 0.730 [95% CI: 0.67–0.8)] for LIPS-2009 and CRP-48 respectively. These AUCs were statistically significant when compared to the AUC of 0.5 (p=0.000 for the three AUCs) while comparing those AUCs together revealed a non-significant difference (p=0.9, 0.9, 0.8 for pairwise comparison of different ROC curves) (Fig. 1). Table 2 shows the cut-off values of the different variables with their sensitivity, specificity, positive likelihood ratio (LR+) and negative likelihood ratio (LR−).

Figure 1.

The ROC curve for the LIPS-2009, LIPS-2011 scores and CRP-48 in predicting ARDS.

(0.18MB).
Table 2.

The cut-off values of the different variables with their sensitivity, specificity, LR+, and LR−.

Variable  Cut-off value  Sensitivity  95% CI  Specificity  95% CI  LR+  95% CI  LR−  95% CI 
LIPS-2009−1  100  95.9–100  0–3.2  1–1     
92  84–97  53  43–62  1.95  1.6–2.4  0.15  0.07–0.3 
0–4.1  100  96.8–100      1–1 
LIPS-2011−1  100  95.9–100  0–3.2  1–1     
3.5  75  65–84  62  52–71  1.95  1.5–2.5  0.41  0.3–0.6 
7.5  5.7  1.9–12.8  100  96.8–100      0.94  0.9–1 
CRP-48 (mg/L)17  100  95.9–100  15  9.1–23.2  1.18  1.1–1.3     
48  76  66–85  62  52–71  1.98  1.5–2.6  0.39  0.3–0.6 
317  0–4.1  100  96.8–100      1–1 
LIPS-N−2.9  100  95.9–100  1–9  1.04  1–1.1     
−0.418  78  68–87  69  59–77  2.5  1.9–3.4  0.31  0.2–0.5 
1.8  17  9.9–26.6  100  96.8–100      0.83  0.8–0.9 

LIPS: lung injury prediction score, CRP: C-reactive protein, CI: confidence interval, LR+: positive likelihood ratio, LR−: negative likelihood ratio.

A multivariate binary logistic regression model involving the ΔCRP and LIPS-2011 was studied. The odds ratio (95% CI) of LIPS-2011 was 1.5 (1.3–1.8) and that of Δ CRP was 1.02 (1–1.02). Using their β-coefficient, the following equation was derived: −2.416+(0.41×LIPS-2011)+(0.016×ΔCRP). The new score was estimated according to this equation and was termed as LIPS-N. The LIPS-N was 0.31 (−0.37–1.4) in ARDS patients compared to −0.99 (−1.7–0.2) in non-ARDS patients [p=0.000, 95% CI for Hodges–Lehmann median difference −1.4 (−1.8,−1.1)]. We compared the new LIPS-N and LIPS-2011 scores using ROC analysis to evaluate their AUC. The AUC of the LIPS-N was 0.8 [95% CI (0.74–0.86)] which is significantly higher than AUC of 0.5 (p=0.000). The AUC of LIPS-N was seen to be significantly higher than that of LIPS-2011 (p=0.01) (Fig. 2). The cut-off of the LIPS-N and their sensitivity, specificity, LR+ and LR− are seen in Table 2. The odds ratio (95% CI) of patients with LIPS-N more than −0.418 compared to those with less LIPS-N was 7.989 (4.2–15.3).

Figure 2.

The ROC curve for the LIPS-N and LIPS-2011 scores in predicting ARDS.

(0.14MB).
Discussion

We found in this study that the risk of progression to ARDS may be ascertained using the LIPS scores; either derived by Cartin-Ceba et al.7 (LIPS-2009) or by Trillo-Alvarez et al.8 (LIPS-2011) early in the course of illness. Both LIPS scores are significantly higher in patients who developed ARDS. We evaluated the accuracy of the LIPS for predicting ARDS using ROC curve. The AUC was 0.740 for LIPS-2011 compared to 0.738 for LIPS-2009 which is statistically insignificant. LIPS-2011 score of 3.5 was 75% sensitive and 62% specific for predicting ARDS while a LIPS-2009 score of 2 was found to have a sensitivity of 92% and specificity of 53%. In their derivation cohort for the LIPS-2009, Cartin-Ceba et al.7 found higher AUC of 0.85 for predicting ARDS in a population of 1431 patients which is nearly similar to the AUC derived by Trillo-Alvarez and colleagues8 which was 0.84 in their retrospective derivation and prospective validation cohorts using the LIPS-2011 score with a cut-off value of 3 to have 69% sensitive and 84% specific.

In surgically ventilated patients, Bauman et al. found that LIPS is predictive for ARDS with AUC of 0.7926 with 50% increase in the development of ARDS for every one-unit increase in LIPS. They however, used LIPS derived by Gajic et al.10 which we did not use in our study. In their study on 5584 patients, Gajic et al.10 derived their score on 2500 patients and validated it on the remaining 3084 patients. They identified AUC for the LIPS of 0.8 for predicting ARDS development in both the derivation and validation cohorts. They identified an optimum cut-off value of 4 to be 69% sensitive and 78% specific. Using this score in ICU patients, Soto et al.27 showed 31% increase in the likelihood of ARDS development for every point increase in LIPS with AUC of 0.7 which is close to ours; with a cut-off value of 4 to be 90% sensitive and 31% specific. Due to the higher mortality of ARDS patients with DAD, Lorente et al. derived a regression model including PaO2/FiO2 ratio, dynamic compliance and age to predict DAD within ARDS patients. The AUC for their model was 0.74 in derivation cohort and 0.73 in the validation cohort.28

The notion of using a biomarker reflecting the severity and course of alveolocapillary inflammation and increased permeability characterizing the ARDS is enthusiastic. Theoretically, the ideal biomarker would be involved in the disease pathogenesis, easy to measure, rapid results availability, and highly sensitive and specific in predicting the required outcome.29 Many biomarkers related to DAD and its association with distal airway pathologic changes characterizing ARDS might be seen of value30,31 and even, too specific biomarker at the molecular level had been studied.32 Many of these biomarkers are not commonly used in clinical practice. Despite being non-specific, C-reactive protein is a biomarker in common clinical use to delineate the activity of host inflammatory conditions such as sepsis, cardiovascular disease and rheumatological disorders.33 Patients with sepsis-induced ARDS have elevated levels of CRP in both plasma and the broncho-alveolar lavage.34 We measured the admission and 48h CRP levels in our study population.

In this study, CRP-48 and the change of the CRP over the first 48h following ICU admission were significantly higher in patients who developed ARDS. CRP-48 had an AUC of 0.730 for predicting patients who developed ARDS. The CRP-48 of 48mg/L was seen to be 76% sensitive and 62% specific. This was concordant with Zheng et al.35 who showed that the CRP can predict the occurrence of ARDS in trauma patients. Contrary to these results, In a study on community acquired pneumonia, Lee et al. concluded that the CRP does not predict patients who required mechanical ventilation and accordingly cannot predict ARDS development.36 Another study conducted by Komiya et al. showed that the CRP had an AUC of 0.831 for discriminating patients with ARDS compared to those with cardiogenic pulmonary edema and that this AUC was increased to 0.931 when CRP was added to the brain natriuretic peptide.37 This study was however used in patients admitted by respiratory failure for the diagnosis rather than for predicting ARDS as we intended to evaluate. Despite the specificity of 62% that we had for CRP-48, it is well-known that the CRP might be elevated in numerous inflammatory disorders and lack a specificity for the ARDS development.33

We incorporated the ΔCRP with the LIPS-2011 in a new score using binary logistic regression model forming the LIPS-N. This score was estimated by the formula of [−2.416+(0.41×LIPS-2011)+(0.016×ΔCRP)]. The AUC of this score was 0.803 which was significantly higher than that of LIPS-2011 alone. A result of this score of −0.418 was found to be 78% sensitive and 69% specific for predicting ARDS. This score however needs to be validated in another sample.

It is important to mention that the incidence of ARDS in this study was very high (44%) compared to other previous studies where the incidence did not exceed 20%8,38–40 and this could be due to using a sample population with APACHE-II score ≥15 representing high risk population who are admitted to the ICU rather than ED or ward admission. In Trillo-Alvarez's study,8 they found ARDS incidence to be 17% in their retrospective derivation cohort of ICU patients compared to 7% in the prospective validation cohort of all hospitalized patients.

Both previously derived LIPS scores were seen to be similarly functioning in terms of ARDS prediction. Both include readily available clinical information known to be associated with ARDS. They identify at-risk patients early during illness with fair sensitivity and specificity. Accordingly, both may be beneficial for segregating subsets of high-risk patients for enrollment in prevention strategies. Adding biomarker may, however, improve the score accuracy.

The lack of optimum sensitivity and specificity of these scores might be attributed to the absence of some well-known risk modifiers for ARDS; large volume transfusion of packed red blood cells and fluid balance are examples of these risk modifiers that was seen by many investigators to affect ARDS risk.14,41 The predictive value of these scoring systems could be accordingly improved using more additional variables including more risk modifiers in all patients. In addition, the exposure to risk factors and risk modifiers is a dynamic process that might develop during the hospital course rather than on admission and so, any predictive tool needs to be dynamic on daily bases. Adding more additional information and data that are unavailable on admission might however affect the simplicity of using these scores in real practice.

Our study is limited by the relatively small sample size that used for the validation of the LIPS and that it is a single center study. We recruited high risk ICU patients with high APACH-II score having higher incidence of ARDS that may explain the needed smaller sample. One of the important factors that should be considered during planning for a preventive study for ARDS is that many of those patients expose to their risk factors prior to their ICU admission. Despite being more difficult, the enrollment of all hospitalized patients might be more practical, yet the authors intended here to validate the LIPS scores in the more critically ICU patients. One of the draw-backs of this study is the validation of the new score derived from the study on the same study sample. The LIPS-N score should be validated in another ICU patients’ sample. The authors used bootstrapping for validation of the regression model.

Despite that the Berlin definition represents the gold standard for ARDS diagnosis, many of its items, like interpretation of portable chest X-ray, remain clinician dependent. Some authors concluded limited experts’ ability to accurately differentiate between ARDS and other causes of respiratory failure.42 On the histopathologic level, many of the clinically diagnosed ARDS patients showed subsequently normal lung after open lung biopsy or autopsy.28,43,44 Finally, many scores with different weighting power for the risk factors are established that limit the ability to compare different studies.

Conclusions

This study concludes that both LIPS scores derived by Cartin-Ceba et al. on 2009 and Trillo-Alvarez et al. on 2011 are equally effective in predicting ARDS in risky ICU patients. The incorporation of change of CRP over the first 48h of ICU admission with the LIPS-2011 score may increase its accuracy in ARDS prediction.

Funding

The study is self-funded.

Author's contribution

Concept: MEHA, KMT, SF, GH.

Design: MEHA, KMT, GH.

Definition of intellectual content: KMT, SF, GH.

Literature search: MEHA, KMT.

Data acquisition: MEHA, SF.

Data analysis and statistical analysis: KMT.

Manuscript preparation: KMT.

Manuscript editing: KMT.

Manuscript review: SF, GH.

Conflict of interest

The authors do not have a conflict of interest to declare.

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