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there are significant technical challenges that must be overcome&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">6</span></a> Such a strategy should only be considered as an absolute last resort&#44; judged against the alternatives of long term &#8220;hand bagging&#8221; or death&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">7</span></a> However&#44; we do know that many institutions are evaluating this practice&#44; and protocols are being developed and tested&#44; and in some places&#44; preliminarily implemented in major cities&#44; such New York has been using it since almost the beginning&#46; On March 24&#44; 2020&#44; The Food and Drug Administration &#40;FDA&#41;&#44; granted an Emergency Use Authorization for modifications of a host of ventilator-type devices to be used during the COVID-19 pandemic&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">8</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">The novel idea was not initially conceived to ventilate ARDS&#47;COVID19 patients&#46; In the last several past weeks&#44; we modified and tested this system &#40;&#8220;in vitro&#8221;&#41; at King&#39;s College Hospital NHS Trust Foundation&#44; to be able to ventilate two patients with a standard ICU ventilator&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Two sets of standard ventilator tubing &#40;Hudson&#41; were connected to a single ventilator &#40;tested in each model of a ventilator&#44; Puritan-Bennett&#44; 840 series and a Servo I Maquet&#41; via two &#8220;T-tubes&#8221; &#40;one on the patient inflow limb of the circuit&#44; and one on the patient exhaust limb&#41;&#46; Each &#8220;T-tube&#8221; was attached to a microfilter &#40;total of four&#41; to isolated both patients and the ventilator &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Figure 1</a>&#41;&#46; Finally&#44; a heat and moisture exchanger &#40;HME&#41; filter was placed for each patient to provide heating and humidification &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Figure 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">One of the clear advantages with pressure-control ventilation&#44; it is that in the case of a change in the respiratory mechanics of one patient&#44; the second is not affected and there is less dependence on ideal body weight&#44; sex and the compliances of the lung&#46; Also&#44; with a flow&#47;pressure sensor to measure the expiratory tidal volume &#40;VTe&#41;&#44; the inspiratory peak and mean airway pressures&#44; with the capnography placed&#44; at least in one patient&#44; the monitoring and safety increase considerably&#46; Other variants with extra features and potential better improvements have been also released recently by colleagues around the world&#44; but we must declare that we have not tested these variations in our laboratory&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">We are aware that there are no available randomised control studies to support this approach with full guarantees&#44; however&#44; in our current times where the professional is taking ethical decisions extremely difficult it may be considered as a good alternative as &#8220;compassionate treatment&#8221; or as a &#8220;bridge&#8221; for the time being&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Declarations section</span><p id="par0035" class="elsevierStylePara elsevierViewall">Ethics approval and consent to participate&#58; &#8220;Not applicable&#8221;&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Consent for publication&#58; &#8220;Not applicable&#8221;&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Author Contributions</span><p id="par0045" class="elsevierStylePara elsevierViewall">S&#46; R&#46; V was the main study &#8220;in vitro&#8221; researcher and who draft the manuscript&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Funding</span><p id="par0050" class="elsevierStylePara elsevierViewall">Financial support&#44; including any institutional departmental funds&#44; was not sought for the study&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Conflict of interests</span><p id="par0055" class="elsevierStylePara elsevierViewall">All faculty and staff who are in a position to control or affect the content of this paper have declared that they have no competing financial &#47;commercial interests at all&#46;</p></span></span>"
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Sharing a single ventilator (“In vitro”)
Compartir un ventilador (“In vitro”) para dos pacientes
Sancho Rodríguez-Villara,b,
Autor para correspondencia
sancho.villar@nhs.com

Consultant in Intensive Care Medicine, King's College Hospital NHS Trust Foundation, London. UK.
a Department of Critical Care, King's College Hospital NHS Trust Foundation. London, United Kingdom
b Honorary Senior Clinical Lecturer in the GKT School of Medical Education, Faculty of Life Sciences & Medicine at King's College London. London, United Kingdom
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there are significant technical challenges that must be overcome&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">6</span></a> Such a strategy should only be considered as an absolute last resort&#44; judged against the alternatives of long term &#8220;hand bagging&#8221; or death&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">7</span></a> However&#44; we do know that many institutions are evaluating this practice&#44; and protocols are being developed and tested&#44; and in some places&#44; preliminarily implemented in major cities&#44; such New York has been using it since almost the beginning&#46; On March 24&#44; 2020&#44; The Food and Drug Administration &#40;FDA&#41;&#44; granted an Emergency Use Authorization for modifications of a host of ventilator-type devices to be used during the COVID-19 pandemic&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">8</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">The novel idea was not initially conceived to ventilate ARDS&#47;COVID19 patients&#46; In the last several past weeks&#44; we modified and tested this system &#40;&#8220;in vitro&#8221;&#41; at King&#39;s College Hospital NHS Trust Foundation&#44; to be able to ventilate two patients with a standard ICU ventilator&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Two sets of standard ventilator tubing &#40;Hudson&#41; were connected to a single ventilator &#40;tested in each model of a ventilator&#44; Puritan-Bennett&#44; 840 series and a Servo I Maquet&#41; via two &#8220;T-tubes&#8221; &#40;one on the patient inflow limb of the circuit&#44; and one on the patient exhaust limb&#41;&#46; Each &#8220;T-tube&#8221; was attached to a microfilter &#40;total of four&#41; to isolated both patients and the ventilator &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Figure 1</a>&#41;&#46; Finally&#44; a heat and moisture exchanger &#40;HME&#41; filter was placed for each patient to provide heating and humidification &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Figure 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">One of the clear advantages with pressure-control ventilation&#44; it is that in the case of a change in the respiratory mechanics of one patient&#44; the second is not affected and there is less dependence on ideal body weight&#44; sex and the compliances of the lung&#46; Also&#44; with a flow&#47;pressure sensor to measure the expiratory tidal volume &#40;VTe&#41;&#44; the inspiratory peak and mean airway pressures&#44; with the capnography placed&#44; at least in one patient&#44; the monitoring and safety increase considerably&#46; Other variants with extra features and potential better improvements have been also released recently by colleagues around the world&#44; but we must declare that we have not tested these variations in our laboratory&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">We are aware that there are no available randomised control studies to support this approach with full guarantees&#44; however&#44; in our current times where the professional is taking ethical decisions extremely difficult it may be considered as a good alternative as &#8220;compassionate treatment&#8221; or as a &#8220;bridge&#8221; for the time being&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Declarations section</span><p id="par0035" class="elsevierStylePara elsevierViewall">Ethics approval and consent to participate&#58; &#8220;Not applicable&#8221;&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Consent for publication&#58; &#8220;Not applicable&#8221;&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Author Contributions</span><p id="par0045" class="elsevierStylePara elsevierViewall">S&#46; R&#46; V was the main study &#8220;in vitro&#8221; researcher and who draft the manuscript&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Funding</span><p id="par0050" class="elsevierStylePara elsevierViewall">Financial support&#44; including any institutional departmental funds&#44; was not sought for the study&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Conflict of interests</span><p id="par0055" class="elsevierStylePara elsevierViewall">All faculty and staff who are in a position to control or affect the content of this paper have declared that they have no competing financial &#47;commercial interests at all&#46;</p></span></span>"
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          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Two sets of standard ventilator tubing &#40;Hudson&#41; were connected to a single ventilator &#40;tested in each model of ventilator&#44; Puritan-Bennett&#44; 840 series and a Servo I Maquet&#41; via two T-tubes &#40;one on the patient inflow limb of the circuit&#44; and one on the patient exhaust limb&#41;&#46; Each T-tube was attached to a microfilter &#40;total of four&#41; to isolated both patients and the ventilator&#46; Especially if the circuit do not have in place non-return valves&#46;</p>"
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                  "referenciaCompleta" => "The Society of Critical Care Medicine &#40;SCCM&#41;&#44; American Association for Respiratory Care &#40;AARC&#41;&#44; American Society of Anesthesiologists &#40;ASA&#41;&#44; Anesthesia Patient Safety Foundation &#40;APSF&#41;&#44; American Association of Critical-Care Nurses &#40;AACN&#41;&#44; and American College of Chest Physicians &#40;CHEST&#41; issue&#160;this consensus statement&#160;on the concept of placing multiple patients on a single mechanical ventilator&#46; March 26&#44; 2020&#46;"
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                  "referenciaCompleta" => "U&#46;S&#46; Food and Drug Administration&#46; Emergency Use Authorization &#91;cited Mar 24&#44; 2020&#93;&#46; Available at&#58; https&#58;&#47;&#47;www&#46;fda&#46;gov&#47;media&#47;136423&#47;download"
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