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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Extracorporeal gas exchange for acute respiratory failure in adult patients: a systematic review</title><author><name sortKey="Schmidt, Matthieu" sort="Schmidt, Matthieu" uniqKey="Schmidt M" first="Matthieu" last="Schmidt">Matthieu Schmidt</name><affiliation><nlm:aff id="Aff1">Université Pierre et Marie Curie, Medical-Surgical Intensive Care Unit, iCAN, Institute of Cardiometabolism and Nutrition, Hôpital de la Pitié–Salpêtrière, Assistance Publique–Hôpitaux de Paris, Paris, France</nlm:aff></affiliation></author><author><name sortKey="Hodgson, Carol" sort="Hodgson, Carol" uniqKey="Hodgson C" first="Carol" last="Hodgson">Carol Hodgson</name><affiliation><nlm:aff id="Aff2">The Australian & New Zealand Intensive Care Research Centre and the Intensive Care Department, Alfred Hospital, Melbourne, Australia</nlm:aff></affiliation></author><author><name sortKey="Combes, Alain" sort="Combes, Alain" uniqKey="Combes A" first="Alain" last="Combes">Alain Combes</name><affiliation><nlm:aff id="Aff1">Université Pierre et Marie Curie, Medical-Surgical Intensive Care Unit, iCAN, Institute of Cardiometabolism and Nutrition, Hôpital de la Pitié–Salpêtrière, Assistance Publique–Hôpitaux de Paris, Paris, France</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25887146</idno><idno type="pmc">4484573</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4484573</idno><idno type="RBID">PMC:4484573</idno><idno type="doi">10.1186/s13054-015-0806-z</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000E80</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000E80</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Extracorporeal gas exchange for acute respiratory failure in adult patients: a systematic review</title><author><name sortKey="Schmidt, Matthieu" sort="Schmidt, Matthieu" uniqKey="Schmidt M" first="Matthieu" last="Schmidt">Matthieu Schmidt</name><affiliation><nlm:aff id="Aff1">Université Pierre et Marie Curie, Medical-Surgical Intensive Care Unit, iCAN, Institute of Cardiometabolism and Nutrition, Hôpital de la Pitié–Salpêtrière, Assistance Publique–Hôpitaux de Paris, Paris, France</nlm:aff></affiliation></author><author><name sortKey="Hodgson, Carol" sort="Hodgson, Carol" uniqKey="Hodgson C" first="Carol" last="Hodgson">Carol Hodgson</name><affiliation><nlm:aff id="Aff2">The Australian & New Zealand Intensive Care Research Centre and the Intensive Care Department, Alfred Hospital, Melbourne, Australia</nlm:aff></affiliation></author><author><name sortKey="Combes, Alain" sort="Combes, Alain" uniqKey="Combes A" first="Alain" last="Combes">Alain Combes</name><affiliation><nlm:aff id="Aff1">Université Pierre et Marie Curie, Medical-Surgical Intensive Care Unit, iCAN, Institute of Cardiometabolism and Nutrition, Hôpital de la Pitié–Salpêtrière, Assistance Publique–Hôpitaux de Paris, Paris, France</nlm:aff></affiliation></author></analytic><series><title level="j">Critical Care</title><idno type="ISSN">1364-8535</idno><idno type="eISSN">1466-609X</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>This article is one of ten reviews selected from the Annual Update in Intensive Care and Emergency Medicine 2015 and co-published as a series in Critical Care. Other articles in the series can be found online at <ext-link ext-link-type="uri" xlink:href="http://ccforum.com/series/annualupdate2015">http://ccforum.com/series/annualupdate2015</ext-link>. Further information about the Annual Update in Intensive Care and Emergency Medicine is available from <ext-link ext-link-type="uri" xlink:href="http://www.springer.com/series/8901">http://www.springer.com/series/8901</ext-link>.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Dreyfuss, D" uniqKey="Dreyfuss D">D Dreyfuss</name></author><author><name sortKey="Soler, P" uniqKey="Soler P">P Soler</name></author><author><name sortKey="Basset, G" uniqKey="Basset G">G Basset</name></author><author><name sortKey="Saumon, G" uniqKey="Saumon G">G Saumon</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Guerin, C" uniqKey="Guerin C">C Guerin</name></author><author><name sortKey="Reignier, J" uniqKey="Reignier J">J Reignier</name></author><author><name sortKey="Richard, Jc" uniqKey="Richard J">JC Richard</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Papazian, L" 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Crit Care</journal-id><journal-title-group><journal-title>Critical Care</journal-title></journal-title-group><issn pub-type="ppub">1364-8535</issn><issn pub-type="epub">1466-609X</issn><publisher><publisher-name>BioMed Central</publisher-name><publisher-loc>London</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">25887146</article-id><article-id pub-id-type="pmc">4484573</article-id><article-id pub-id-type="publisher-id">806</article-id><article-id pub-id-type="doi">10.1186/s13054-015-0806-z</article-id><article-categories><subj-group subj-group-type="heading"><subject>Review</subject></subj-group></article-categories><title-group><article-title>Extracorporeal gas exchange for acute respiratory failure in adult patients: a systematic review</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Schmidt</surname><given-names>Matthieu</given-names></name><address><email>matthieuschmidt@yahoo.fr</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Hodgson</surname><given-names>Carol</given-names></name><address><email>carol.hodgson@monash.edu</email></address><xref ref-type="aff" rid="Aff2"></xref></contrib><contrib contrib-type="author" corresp="yes"><name><surname>Combes</surname><given-names>Alain</given-names></name><address><email>alain.combes@psl.aphp.fr</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><aff id="Aff1"><label></label>Université Pierre et Marie Curie, Medical-Surgical Intensive Care Unit, iCAN, Institute of Cardiometabolism and Nutrition, Hôpital de la Pitié–Salpêtrière, Assistance Publique–Hôpitaux de Paris, Paris, France</aff><aff id="Aff2"><label></label>The Australian & New Zealand Intensive Care Research Centre and the Intensive Care Department, Alfred Hospital, Melbourne, Australia</aff></contrib-group><pub-date pub-type="epub"><day>16</day><month>3</month><year>2015</year></pub-date><pub-date pub-type="ppub"><year>2015</year></pub-date><volume>19</volume><issue>1</issue><elocation-id>99</elocation-id><permissions><copyright-statement>© Springer-Verlag and BioMed Central. 2015</copyright-statement><license license-type=""><license-p>This article is co-published by agreement with Springer-Verlag. Permission for reuse must be sought from the publisher.</license-p></license></permissions><abstract id="Abs1"><p>This article is one of ten reviews selected from the Annual Update in Intensive Care and Emergency Medicine 2015 and co-published as a series in Critical Care. Other articles in the series can be found online at <ext-link ext-link-type="uri" xlink:href="http://ccforum.com/series/annualupdate2015">http://ccforum.com/series/annualupdate2015</ext-link>. Further information about the Annual Update in Intensive Care and Emergency Medicine is available from <ext-link ext-link-type="uri" xlink:href="http://www.springer.com/series/8901">http://www.springer.com/series/8901</ext-link>.</p></abstract><custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name><meta-value>© The Author(s) 2015</meta-value></custom-meta></custom-meta-group></article-meta></front><body><sec id="Sec1" sec-type="intro"><title>Introduction</title><p>Mechanical ventilation remains the cornerstone of respiratory support for patients with acute respiratory failure. However, high pressure and volume associated with tidal ventilation are known to aggravate lung injury in this setting [<xref ref-type="bibr" rid="CR1">1</xref>]. Furthermore, profound gas-exchange abnormalities threatening patients’ lives can occur in the most severe forms of the disease despite recourse to conventional salvage therapies [<xref ref-type="bibr" rid="CR2">2</xref>,<xref ref-type="bibr" rid="CR3">3</xref>]. Extracorporeal gas exchange devices, i.e., venovenous extracorporeal membrane oxygenation (ECMO) and extracorporeal carbon dioxide removal (ECCO<sub>2</sub>R), were developed more than 40 years ago [<xref ref-type="bibr" rid="CR4">4</xref>,<xref ref-type="bibr" rid="CR5">5</xref>] to rescue these dying patients. Whereas venovenous ECMO provides complete extracorporeal blood oxygenation and decarboxylation using high blood flows (4–6 l/min) and large (20–30 Fr) cannulas [<xref ref-type="bibr" rid="CR6">6</xref>-<xref ref-type="bibr" rid="CR9">9</xref>], efficient extracorporeal CO<sub>2</sub> removal (with minimal blood oxygenation) can be achieved with ECCO<sub>2</sub>R devices using limited extracorporeal blood flow (0.4–1 l/min) and thin double lumen venous catheters (14–18 Fr) [<xref ref-type="bibr" rid="CR10">10</xref>,<xref ref-type="bibr" rid="CR11">11</xref>], because CO<sub>2</sub> clearance is more effective than oxygenation due to the greater solubility and more rapid diffusion of CO<sub>2</sub> [<xref ref-type="bibr" rid="CR12">12</xref>]. Extracorporeal gas exchange devices also permit ‘ultraprotective’ mechanical ventilation with further reduction of volume and pressure, which may ultimately enhance lung protection and improve clinical outcomes for patients with acute respiratory distress syndrome (ARDS). However, results of trials evaluating extracorporeal gas exchange for respiratory failure performed in the 1970s, 80s and 90s were often disappointing [<xref ref-type="bibr" rid="CR13">13</xref>,<xref ref-type="bibr" rid="CR14">14</xref>]. In recent years, major technological advances have occurred and the latest generation extracorporeal gas exchange devices, with polymethylpentene hollow-fiber membrane lungs and Mendler-designed centrifugal pumps offer lower resistance to blood flow, have smaller priming volumes, higher effective gas exchange properties and are coated with more biocompatible materials.</p><p>The successful use of ECMO for the most severe ARDS cases associated with the recent influenza A(H1N1) pandemic, in whom conventional ventilation was not successful [<xref ref-type="bibr" rid="CR15">15</xref>-<xref ref-type="bibr" rid="CR17">17</xref>], and positive results of the randomized Conventional ventilatory support versus Extracorporeal membrane oxygenation for Severe Adult Respiratory failure (CESAR) trial [<xref ref-type="bibr" rid="CR18">18</xref>] have been associated with a steep increase in the number of VV-ECMO procedures performed in very recent years (Figure <xref rid="Fig1" ref-type="fig">1</xref>). In addition, a proof-of-concept study suggested that the very low tidal volume ventilation (3.5–5 ml/kg of predicted body weight) permitted by ECCO<sub>2</sub>R can improve pulmonary protection and decrease pulmonary inflammation in ARDS patients [<xref ref-type="bibr" rid="CR19">19</xref>] and a recent randomized trial suggested that this strategy may be associated with better outcomes for moderate to severe ARDS patients [<xref ref-type="bibr" rid="CR11">11</xref>].<fig id="Fig1"><label>Figure 1</label><caption><p><bold>Number of annual adult respiratory cases treated by ECMO and relative survival rates over 15 years (adapted from [</bold><xref ref-type="bibr" rid="CR73">73</xref><bold>]).</bold></p></caption><graphic xlink:href="13054_2015_806_Fig1_HTML" id="MO1"></graphic></fig></p><p>The aim of this systematic review was to analyze studies reporting indications, associated complications and short- and long-term outcomes of extracorporeal gas exchange in adult patients with acute respiratory failure. It may ultimately help critical care physicians and researchers select better candidates for extracorporeal gas exchange and to design future observational and randomized clinical trials to evaluate these techniques.</p></sec><sec id="Sec2" sec-type="methods"><title>Methods</title><p>To achieve a high standard of reporting, we adopted Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines [<xref ref-type="bibr" rid="CR20">20</xref>,<xref ref-type="bibr" rid="CR21">21</xref>].</p><sec id="Sec3"><title>Search strategy</title><p>The detailed search strategy (identification, screening, eligibility and inclusion process) used to identify relevant studies is summarized in Figure <xref rid="Fig2" ref-type="fig">2</xref>. We used a detailed PubMed/MEDLINE, EMBASE and CINAHL query to identify randomized controlled trials (RCTs), controlled observational studies (retrospective and prospective) and case series with >5 patients who received extracorporeal gas exchange. Additionally, reference lists from relevant reviews, observational studies and clinical trials were hand-searched. Neonatal and pediatric studies (patients < 18 years of age) were excluded. Language of publication was limited to English and no restriction on the time was set on the primary literature searches. The query was last updated in June 2014.<fig id="Fig2"><label>Figure 2</label><caption><p><bold>Summary of evidence search and selection: PRISMA flow chart.</bold></p></caption><graphic xlink:href="13054_2015_806_Fig2_HTML" id="MO2"></graphic></fig></p></sec><sec id="Sec4"><title>Study selection</title><p>Two independent researchers (MS and AC) conducted a two-step literature search. Studies were included according to the following criteria: 1) original study published in a peer-reviewed journal; and 2) analyzed/reported the use of extracorporeal gas exchange (i.e., ECMO or pumpless extracorporeal lung assist or extracorporeal CO<sub>2</sub> removal) and its specific outcomes for acute respiratory failure in adult patients. Any discrepancies between the two reviewers who examined the titles and abstracts of all relevant citations were resolved by discussion.</p></sec><sec id="Sec5"><title>Data extraction, quality assessment and analysis</title><p>The two reviewers (MS and AC) independently read the entire texts of the retrieved reports and rated study quality using well-established criteria [<xref ref-type="bibr" rid="CR21">21</xref>,<xref ref-type="bibr" rid="CR22">22</xref>]. RCT quality was graded using a nine-point scale combining elements from Jadad’s [<xref ref-type="bibr" rid="CR21">21</xref>] and Chalmers’ [<xref ref-type="bibr" rid="CR23">23</xref>,<xref ref-type="bibr" rid="CR24">24</xref>] scales, whereas the quality of case-controlled studies was appraised using the Newcastle-Ottawa scale [<xref ref-type="bibr" rid="CR25">25</xref>]. In addition, both reviewers extracted the following data: First author, year of publication, country, study design, number of patients, demographic data, pre-ECMO ventilation and blood gas data and outcomes. Because of very high heterogeneity between studies, related to different generation ECMO and ECCO<sub>2</sub>R devices used in the last 40 years, different patient populations evaluated, and the scarcity of randomized or quasi-randomized trials (most of which were flawed by major methodological limitations) performed with the latest generation extracorporeal gas exchange techniques, we did not perform meta-analyses of randomized or quasi-randomized trials and choose to report and discuss only crude study results.</p></sec></sec><sec id="Sec6" sec-type="results"><title>Results</title><sec id="Sec7"><title>Number of studies selected</title><p>The initial search yielded 535 articles, of which 462 were excluded through title and abstract review, leaving 73 articles potentially meeting our inclusion criteria. After a complete analysis of these, 17 articles were excluded. Of the remaining 56 studies that were evaluated, 4 were RCTs, 7 case–control studies, and 45 case series (Figure <xref rid="Fig2" ref-type="fig">2</xref> and Tables <xref rid="Tab1" ref-type="table">1</xref>, <xref rid="Tab2" ref-type="table">2</xref>, <xref rid="Tab3" ref-type="table">3</xref>, <xref rid="Tab4" ref-type="table">4</xref>, <xref rid="Tab5" ref-type="table">5</xref> and <xref rid="Tab6" ref-type="table">6</xref>). With the exception of two studies [<xref ref-type="bibr" rid="CR13">13</xref>,<xref ref-type="bibr" rid="CR18">18</xref>], all ECMO cohorts had an observational design. Sixteen studies reported on the outcomes of ARDS cases associated with the recent influenza A(H1N1) pandemic (Tables <xref rid="Tab4" ref-type="table">4</xref> and <xref rid="Tab5" ref-type="table">5</xref>). Ten studies (2 randomized) reporting on ECCO<sub>2</sub>R devices in ARDS patients were retained for the review (Table <xref rid="Tab6" ref-type="table">6</xref>). Overall study validity was adequate, with an average score of 8.1/9.0 on the Newcastle-Ottawa scale appraising the quality of case–control studies.<table-wrap id="Tab1"><label>Table 1</label><caption><p><bold>Large, recent studies of ECMO for acute respiratory failure: Key patient features</bold></p></caption><table frame="hsides" rules="groups"><thead><tr valign="top"><th><bold>First author [ref]</bold></th><th><bold>Design</bold></th><th><bold>Prospective</bold></th><th><bold>Setting</bold></th><th><bold>Quality assessment</bold><sup><bold>§</bold></sup></th><th><bold>Follow up</bold></th><th><bold>ECMO patients</bold></th><th><bold>Years</bold></th><th><bold>Age</bold></th><th><bold>Pneumonia, %</bold></th><th><bold>Mobile ECMO team, %</bold></th><th><bold>SOFA score</bold></th></tr></thead><tbody><tr valign="top"><td>Peek, ECMO Arm, CESAR trial [<xref ref-type="bibr" rid="CR18">18</xref>]</td><td>RCT</td><td>Y</td><td>Multi</td><td>RCT6</td><td>6 months</td><td>68</td><td>2001–2006</td><td>40 ± 13</td><td>62</td><td>0</td><td>–</td></tr><tr valign="top"><td>Schmidt [<xref ref-type="bibr" rid="CR50">50</xref>]</td><td>Case series</td><td>Y</td><td>Multi</td><td>–</td><td>Hospital discharge</td><td>2,355</td><td>2000–2012</td><td>41 (28–54)</td><td>34</td><td>–</td><td>–</td></tr><tr valign="top"><td>Brogan [<xref ref-type="bibr" rid="CR26">26</xref>]</td><td>Case series</td><td>N</td><td>Multi</td><td>–</td><td>Hospital discharge</td><td>1,473</td><td>1986–2006</td><td>35 (22–53)</td><td>26</td><td>–</td><td>–</td></tr><tr valign="top"><td>Enger [<xref ref-type="bibr" rid="CR51">51</xref>]</td><td>Case series</td><td>Y</td><td>Single</td><td>–</td><td>Hospital discharge</td><td>284</td><td>2008–2013</td><td>46 (43–48)<sup>†</sup></td><td>49</td><td>47</td><td>11 (11–12)</td></tr><tr valign="top"><td>Hemmila [<xref ref-type="bibr" rid="CR27">27</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>–</td><td>Hospital discharge</td><td>280</td><td>1989–2003</td><td>38 ± 13</td><td>31</td><td>37</td><td>–</td></tr><tr valign="top"><td>Schmid [<xref ref-type="bibr" rid="CR32">32</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>–</td><td>ICU discharge</td><td>176</td><td>2007–2010</td><td>48 ± 17</td><td>58</td><td>34</td><td>12 ± 4</td></tr><tr valign="top"><td>Schmidt [<xref ref-type="bibr" rid="CR33">33</xref>]</td><td>Case series</td><td>N</td><td>Multi</td><td>–</td><td>6 months</td><td>140</td><td>2008–2012</td><td>44 (30–56)</td><td>71<sup>£</sup></td><td>68</td><td>12 (10–15)</td></tr><tr valign="top"><td>Lindskov [<xref ref-type="bibr" rid="CR31">31</xref>]</td><td>Case series</td><td>Y</td><td>Single</td><td>–</td><td>ICU discharge</td><td>124</td><td>1977–2011</td><td>42 (16–67)</td><td>64</td><td>85</td><td>–</td></tr><tr valign="top"><td>Roch [<xref ref-type="bibr" rid="CR49">49</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>–</td><td>Hospital discharge</td><td>85</td><td>2009–2013</td><td>47 ± 15</td><td>86</td><td>100</td><td>9 (7–11)</td></tr><tr valign="top"><td>Rega [<xref ref-type="bibr" rid="CR74">74</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>–</td><td>90 days</td><td>70</td><td>1997–2005</td><td>43 ± 18</td><td>41</td><td>–</td><td>–</td></tr><tr valign="top"><td>Mols [<xref ref-type="bibr" rid="CR28">28</xref>]</td><td>Case–control</td><td>Y</td><td>Single</td><td>7</td><td>Hospital discharge</td><td>62</td><td>1991–1999</td><td>35 ± 11</td><td>58</td><td>0</td><td>7 (6–9)</td></tr><tr valign="top"><td>Muller [<xref ref-type="bibr" rid="CR35">35</xref>]</td><td>Case series</td><td>Y</td><td>Single</td><td>–</td><td>ICU discharge</td><td>60</td><td>2006–2008</td><td>53 (21–78)</td><td>42</td><td>17</td><td>14 (11–16)</td></tr><tr valign="top"><td>Lewandowski [<xref ref-type="bibr" rid="CR29">29</xref>]</td><td>Case–control</td><td>Y</td><td>Single</td><td>9</td><td>ICU discharge</td><td>49</td><td>1989–1995</td><td>31 ± 14</td><td>37</td><td>–</td><td>–</td></tr><tr valign="top"><td>Forrest [<xref ref-type="bibr" rid="CR34">34</xref>]</td><td>Case series</td><td>N</td><td>Multi</td><td>–</td><td>Hospital discharge</td><td>38</td><td>2007–2010</td><td>34 (26–42)</td><td>89<sup>#</sup></td><td>100</td><td>8 (5–10)</td></tr><tr valign="top"><td>Frenckner [<xref ref-type="bibr" rid="CR75">75</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>–</td><td>ICU</td><td>38</td><td>1995–2002</td><td>38 (17–61)</td><td>60</td><td>32</td><td></td></tr><tr valign="top"><td>Michaels [<xref ref-type="bibr" rid="CR46">46</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>–</td><td>ICU discharge</td><td>36</td><td>2009–2012</td><td>40 ± 6</td><td>58<sup>$</sup></td><td>69</td><td>–</td></tr><tr valign="top"><td>Beiderlinden [<xref ref-type="bibr" rid="CR30">30</xref>]</td><td>Case–control</td><td>Y</td><td>Single</td><td>9</td><td>Hospital discharge</td><td>32</td><td>1998–2003</td><td>42 ± 13</td><td>53</td><td>–</td><td>14 ± 3</td></tr></tbody></table><table-wrap-foot><p>ICU, intensive care unit; Multi, multicenter; N, no; RCT, randomized control trial; SOFA; Sequential Organ Failure Assessment; Y, yes.</p><p>Data are given as mean ± SD or median (interquartile range). <sup>£</sup>26% were H1N1 pneumonia; <sup>#</sup>42% were H1N1 pneumonia; <sup>$</sup>44% were H1N1 pneumonia.</p><p><sup>§</sup>Randomized controlled trial quality was graded using a nine-point scale combining elements from Jadad’s [<xref ref-type="bibr" rid="CR21">21</xref>] and Chalmers’ scales [<xref ref-type="bibr" rid="CR23">23</xref>,<xref ref-type="bibr" rid="CR24">24</xref>] whereas the validity of case-controlled studies was appraised with the Newcastle-Ottawa scale [<xref ref-type="bibr" rid="CR25">25</xref>]; <sup>†</sup>in the survivors.</p></table-wrap-foot></table-wrap><table-wrap id="Tab2"><label>Table 2</label><caption><p><bold>Large, recent studies of ECMO for acute respiratory failure: Key pre-ECMO data and outcomes</bold></p></caption><table frame="hsides" rules="groups"><thead><tr valign="top"><th><bold>First author [ref]</bold></th><th><bold>PaO</bold><sub><bold>2</bold></sub><bold>/FiO</bold><sub><bold>2</bold></sub></th><th><bold>pH</bold></th><th><bold>Plateau pressure</bold></th><th><bold>PEEP</bold></th><th><bold>LIS</bold></th><th><bold>Delay MV – ECMO, hours</bold></th><th><bold>Rescue therapies, %</bold></th><th><bold>Duration of ECMO, days</bold></th><th><bold>Hemorrhage, %</bold></th><th><bold>Intracerebral hemorrhage, %</bold></th><th><bold>Mortality, n (%)</bold></th></tr></thead><tbody><tr valign="top"><td>Peek, ECMO Arm, CESAR trial [<xref ref-type="bibr" rid="CR18">18</xref>]</td><td>76 ± 29</td><td>7.1 ± 0.1</td><td>–</td><td>14 ± 9</td><td>3.5 ± 0.6</td><td>36 (17–104)</td><td>–</td><td>10 (5–23)</td><td>–</td><td>0</td><td>33 (37%)</td></tr><tr valign="top"><td>Schmidt [<xref ref-type="bibr" rid="CR50">50</xref>]</td><td>59 (48–75)</td><td>7.25 (7.15–7.35)</td><td>36 (31–43)<sup>*</sup></td><td>13 (10–16)</td><td>–</td><td>57 (19–151)</td><td>30</td><td>7 (4–13)</td><td>–</td><td>–</td><td>1,017 (43%)</td></tr><tr valign="top"><td>Brogan [<xref ref-type="bibr" rid="CR26">26</xref>]</td><td>57 (45–71)</td><td>7.27 (7.18–7.36)</td><td>40 (35–48)<sup>*</sup></td><td>13 (10–16)</td><td>–</td><td>52 (20–160)</td><td>–</td><td>23 ± 20</td><td>30</td><td>4</td><td>732 (50%)</td></tr><tr valign="top"><td>Enger [<xref ref-type="bibr" rid="CR51">51</xref>]</td><td>69 (65–74)<sup>†</sup></td><td>7.22 (7.22–7.25)<sup>†</sup></td><td>35 (34–36)<sup>*†</sup></td><td>16 (16–17)<sup>†</sup></td><td>3.5 (3.4–3.5)<sup>†</sup></td><td>120 (96–168)<sup>†</sup></td><td>–</td><td>10 (9–11)<sup>†</sup></td><td>–</td><td>–</td><td>117 (41%)</td></tr><tr valign="top"><td>Hemmila [<xref ref-type="bibr" rid="CR27">27</xref>]</td><td>55 ± 16</td><td>7.31 ± 0.12</td><td>44 ± 11<sup>*</sup></td><td>13 ± 5</td><td>–</td><td>96 ± 72</td><td>–</td><td>9 ± 8</td><td>–</td><td>3</td><td>123 (48%)</td></tr><tr valign="top"><td>Schmid [<xref ref-type="bibr" rid="CR32">32</xref>]</td><td>77 ± 47</td><td>7.2 ± 0.2</td><td>35 ± 6<sup>*</sup></td><td>18 ± 6</td><td>3.4 ± 0.5</td><td>144 ± 240</td><td>–</td><td>12 ± 9</td><td>–</td><td>–</td><td>78 (44%)</td></tr><tr valign="top"><td>Schmidt [<xref ref-type="bibr" rid="CR33">33</xref>]</td><td>53(43–60)</td><td>7.22(7.15–7.32)</td><td>32 (30–35)</td><td>10 (8–12)</td><td>–</td><td>120 (24–264)</td><td>94</td><td>15 (8–30)</td><td>46</td><td>3</td><td>50 (36%)</td></tr><tr valign="top"><td>Lindskov [<xref ref-type="bibr" rid="CR31">31</xref>]</td><td>48 (37–60)</td><td>7.26 ± 0.15</td><td>37 (35–41)</td><td>–</td><td>–</td><td>–</td><td>–</td><td>9 (1–23)</td><td>–</td><td>9</td><td>36 (29%)</td></tr><tr valign="top"><td>Roch [<xref ref-type="bibr" rid="CR49">49</xref>]</td><td>60 (50–70)</td><td>7.1 ± 0.2</td><td>32 (29–35)</td><td>–</td><td>3.5 (3.3–3.7)</td><td>48 (24– 194)</td><td>85</td><td>9 (7–13)</td><td>29</td><td>2</td><td>48 (56%)</td></tr><tr valign="top"><td>Rega [<xref ref-type="bibr" rid="CR74">74</xref>]</td><td>56 ± 18</td><td>7.22 ± 0.18</td><td>44 ± 11<sup>*</sup></td><td>13 ± 3</td><td>–</td><td>108 ± 178</td><td>–</td><td>7 ± 5</td><td>20</td><td>–</td><td>40 (57%)</td></tr><tr valign="top"><td>Mols [<xref ref-type="bibr" rid="CR28">28</xref>]</td><td>96 ± 51</td><td>7.30 (7.22–7.40)</td><td>–</td><td>–</td><td>3.2 ± 0.4</td><td>–</td><td>–</td><td>12 ± 7</td><td>7</td><td>2</td><td>28 (45%)</td></tr><tr valign="top"><td>Muller [<xref ref-type="bibr" rid="CR35">35</xref>]</td><td>64 (48–86)</td><td>7.20 (7.13–7.30)</td><td>36 (32–40)<sup>*</sup></td><td>16 (13–20)</td><td>3.6 (3.3–3.8)</td><td>1.0 (1.0–4.8)</td><td>–</td><td>9 (5–13)</td><td>30</td><td>–</td><td>33 (55%)</td></tr><tr valign="top"><td>Lewandowski [<xref ref-type="bibr" rid="CR29">29</xref>]</td><td>–</td><td>7.32 ± 0.10</td><td>39 ± 7<sup>*</sup></td><td>12 ± 3</td><td>3.4 ± 0.2</td><td>312 ± 216</td><td>–</td><td>23 ± 17</td><td>–</td><td>–</td><td>22 (45%)</td></tr><tr valign="top"><td>Forrest [<xref ref-type="bibr" rid="CR34">34</xref>]</td><td>57 (47–65)</td><td>7.20 (7.13–7.3)</td><td>–</td><td>16 (12–18)</td><td>3.7 (3.5–3.7)</td><td>48 (24–48)</td><td>34</td><td>10 (7–17)</td><td>37</td><td>3</td><td>5 (13%)</td></tr><tr valign="top"><td>Frenckner [<xref ref-type="bibr" rid="CR75">75</xref>]</td><td>47 (31–65)</td><td>–</td><td>41 (29–54)<sup>*</sup></td><td>13 (0–20)</td><td>3.5 (3.0–4.0)</td><td>120 (24–672)</td><td>100</td><td>17 (2–57)</td><td>16</td><td>8</td><td>13 (34%)</td></tr><tr valign="top"><td>Michaels [<xref ref-type="bibr" rid="CR46">46</xref>]</td><td>52 ± 3</td><td>–</td><td>–</td><td>–</td><td>–</td><td>68 ± 9</td><td>–</td><td>7 ± 1</td><td>–</td><td>6</td><td>15 (40%)</td></tr><tr valign="top"><td>Beiderlinden [<xref ref-type="bibr" rid="CR30">30</xref>]</td><td>63 ± 28</td><td>7.1 ± 0.2</td><td>–</td><td>19 ± 3</td><td>3.8 ± 0.3</td><td>132 ± 168</td><td>–</td><td>10 (7–15)</td><td>–</td><td>–</td><td>15 (47%)</td></tr></tbody></table><table-wrap-foot><p>LIS, lung injury score; MV, mechanical ventilation; PEEP, positive end-expiratory pressure.</p><p>Data are given as mean ± SD or median (interquartile range). *Peak pressure; <sup>†</sup>in the survivors.</p></table-wrap-foot></table-wrap><table-wrap id="Tab3"><label>Table 3</label><caption><p><bold>Studies of ECMO for ARDS published before 1997 or including < 30 patients</bold></p></caption><table frame="hsides" rules="groups"><thead><tr valign="top"><th><bold>First author [ref]</bold></th><th><bold>Design</bold></th><th><bold>Prospective</bold></th><th><bold>Setting</bold></th><th><bold>Follow up</bold></th><th><bold>Quality of the study</bold></th><th><bold>ECMO patients</bold></th><th><bold>Years</bold></th><th><bold>Age, years</bold></th><th><bold>Pre ECMO PaO</bold><sub><bold>2</bold></sub><bold>/FiO</bold><sub><bold>2</bold></sub><bold>, mmHg</bold></th><th><bold>Length of ECMO, days</bold></th><th><bold>Mortality, n (%)</bold></th></tr></thead><tbody><tr valign="top"><td>Zapol [<xref ref-type="bibr" rid="CR13">13</xref>]</td><td>RCT</td><td>Y</td><td>Multi</td><td>ICU discharge</td><td>RCT4</td><td>42</td><td>1979</td><td>12 to 65</td><td><83</td><td><5 days</td><td>39 (92%)</td></tr><tr valign="top"><td>Macha [<xref ref-type="bibr" rid="CR76">76</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>Hospital discharge</td><td>–</td><td>33</td><td>1990–1995</td><td>36 ± 2</td><td>59 ± 5</td><td>6 ± 1</td><td>13 (39%)</td></tr><tr valign="top"><td>Cordell-Smith [<xref ref-type="bibr" rid="CR77">77</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>ICU discharge</td><td>–</td><td>28</td><td>1992–2000</td><td>27<sup>*</sup></td><td>62<sup>*</sup></td><td>6<sup>*</sup></td><td>8 (29%)</td></tr><tr valign="top"><td>Haneya [<xref ref-type="bibr" rid="CR78">78</xref>]</td><td>Case series</td><td>Y</td><td>Single</td><td>ICU discharge</td><td>–</td><td>22</td><td>2010–2011</td><td>47 (36–61)</td><td>60 (46–75)</td><td>13 (8–19)</td><td>7 (32%)</td></tr><tr valign="top"><td>Hodgson [<xref ref-type="bibr" rid="CR66">66</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>8 months</td><td>–</td><td>21<sup>£</sup></td><td>2009–2011</td><td>36 ± 12</td><td>69(50–105)</td><td>11 (4–16)</td><td>3 (14%)</td></tr><tr valign="top"><td>Huang [<xref ref-type="bibr" rid="CR79">79</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>ICU discharge</td><td>–</td><td>16</td><td>2003–2005</td><td>32 ± 22</td><td>54 ± 8</td><td>7 ± 4</td><td>6 (37%)</td></tr><tr valign="top"><td>Isgrò [<xref ref-type="bibr" rid="CR80">80</xref>]</td><td>Case series</td><td>Y</td><td>Single</td><td>Hospital discharge</td><td>–</td><td>12</td><td>2004–2009</td><td>35 ± 19</td><td>60 ± 11</td><td>–</td><td>6 (54%)</td></tr><tr valign="top"><td>Oshima [<xref ref-type="bibr" rid="CR81">81</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>ICU discharge</td><td>–</td><td>11</td><td>2003–2008</td><td>52 ± 24</td><td>90 ± 10</td><td>10 ± 9</td><td>5 (45%)</td></tr><tr valign="top"><td>Bermudez [<xref ref-type="bibr" rid="CR82">82</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>ICU discharge</td><td>–</td><td>11</td><td>2009–2010</td><td>34 (25–54)</td><td>45 (28–248)</td><td>3 (0–11)</td><td>5 (45%)</td></tr><tr valign="top"><td>Goulon [<xref ref-type="bibr" rid="CR83">83</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>8 months</td><td>–</td><td>11</td><td>1973–1976</td><td>29 (22–37)</td><td>39 ± 12</td><td>3 (1–4)</td><td>9 (82%)</td></tr><tr valign="top"><td>Park [<xref ref-type="bibr" rid="CR84">84</xref>]</td><td>Case series</td><td>N</td><td>Multi</td><td>60 days</td><td>–</td><td>10</td><td>2011</td><td>47 (14–71)</td><td>50 (36–56)</td><td>5 (3–32)</td><td>6 (60%)</td></tr><tr valign="top"><td>Park [<xref ref-type="bibr" rid="CR85">85</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>ICU discharge</td><td>–</td><td>9</td><td>2008–2011</td><td>56 (51–64)</td><td>57 ± 8</td><td>12 ± 6</td><td>10 (55%)</td></tr><tr valign="top"><td>Huang [<xref ref-type="bibr" rid="CR79">79</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>11 (8–51) months</td><td>–</td><td>9</td><td>2004–2007</td><td>35 ± 10</td><td>49 (31–64)</td><td>6 (3–19)</td><td>7 (78%)</td></tr><tr valign="top"><td>Rossaint [<xref ref-type="bibr" rid="CR86">86</xref>]</td><td>Case series</td><td>N</td><td>Single</td><td>Hospital discharge</td><td>–</td><td>8</td><td>1993–1995</td><td>35 (24–49)</td><td>43 ± 4</td><td>8 ± 9</td><td>2 (25%)</td></tr></tbody></table><table-wrap-foot><p>ICU: intensive care unit; Multi: multicenter; N: no; RCT: randomized controlled trial; Y: yes.</p><p>Data are given as mean ± SD or median (interquartile range). *Mean; £ 55% were H1N1pneumonia.</p></table-wrap-foot></table-wrap><table-wrap id="Tab4"><label>Table 4</label><caption><p><bold>Large studies of ECMO for H1N1-induced ARDS</bold></p></caption><table frame="hsides" rules="groups"><thead><tr valign="top"><th></th><th><bold>Pham [</bold><xref ref-type="bibr" rid="CR17">17</xref><bold>]</bold></th><th><bold>Noah [</bold><xref ref-type="bibr" rid="CR16">16</xref><bold>]</bold></th><th><bold>Davies [</bold><xref ref-type="bibr" rid="CR15">15</xref><bold>]</bold></th><th><bold>Patroniti [</bold><xref ref-type="bibr" rid="CR48">48</xref><bold>]</bold></th><th><bold>Schmidt [</bold><xref ref-type="bibr" rid="CR33">33</xref><bold>]</bold></th><th><bold>Michaels [</bold><xref ref-type="bibr" rid="CR46">46</xref><bold>]</bold></th><th><bold>Takeda [</bold><xref ref-type="bibr" rid="CR43">43</xref><bold>]</bold></th><th><bold>Holzgraefe [</bold><xref ref-type="bibr" rid="CR40">40</xref><bold>]</bold></th></tr></thead><tbody><tr valign="top"><td>Patients, n</td><td>123<sup>$</sup></td><td>69<sup>£</sup></td><td>68</td><td>49</td><td>36</td><td>15</td><td>14</td><td>13</td></tr><tr valign="top"><td>Number of centers</td><td>33</td><td>4</td><td>15</td><td>14</td><td>3</td><td>1</td><td>12</td><td>1</td></tr><tr valign="top"><td>Study design</td><td>Case control</td><td>Case control</td><td>Case control</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td></tr><tr valign="top"><td>Newcastle-Ottawa scale</td><td>9</td><td>8</td><td>8</td><td>7</td><td>–</td><td>–</td><td>–</td><td>–</td></tr><tr valign="top"><td>Age, years</td><td>42 (32–53)</td><td>34 (28–46)</td><td>36 (27–45)</td><td>39 (32–46)</td><td>39 (28–53)</td><td>34 ± 4</td><td>54 (43–60)</td><td>31 (25–50)</td></tr><tr valign="top"><td>BMI, kg/m<sup>2</sup></td><td>30.5 ± 8.0</td><td>–</td><td>29 (23–36)</td><td>27 (24–35)</td><td>29 (25–36)</td><td>–</td><td>–</td><td>35 (31–42)</td></tr><tr valign="top"><td>Pregnant or postpartum, n (%)</td><td>18 (15)</td><td>10 (17)</td><td>10 (16)</td><td>4 (8)</td><td>7 (19)</td><td>1(7)</td><td>1 (7)</td><td>3 (23)</td></tr><tr valign="top"><td>SOFA</td><td>9.5 ± 4.0</td><td>9 (7–10)</td><td></td><td>7 (6–9)</td><td>11 (9–14)</td><td>–</td><td>16 (12–19)</td><td>–</td></tr><tr valign="top"><td>Interval MV-ECMO, d</td><td>2 (1–5)</td><td>4 (2–7)</td><td>2 (1–5)</td><td>2 (1–5)</td><td>2 (0–5)</td><td>3.5 ± 0.8</td><td>5.0 (0.8–8.5)</td><td>1 (0–7)</td></tr><tr valign="top"><td>Pre-ECMO parameters</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr valign="top"><td>pH</td><td>7.26 ± 0.12</td><td>–</td><td>7.20 (7.10–7.30)</td><td>7.30 (7.22–7.40)</td><td>7.22 (7.15–7.32)</td><td>–</td><td>–</td><td>7.30(7.30–7.40)</td></tr><tr valign="top"><td>PaO<sub>2</sub>/FiO<sub>2</sub>, mmHg</td><td>59 (51–71)</td><td>55 (46–63)</td><td>56 (48–63)</td><td>63 (56–79)</td><td>50 (41–55)</td><td>62 ± 6</td><td>50 (40–55)</td><td>52 (38–60)</td></tr><tr valign="top"><td>Plateau pressure, mmHg</td><td>32 (29–35)</td><td>–</td><td>36 (33–38)</td><td>33 (30–35)</td><td>32 (30–35)</td><td>–</td><td>30 (29–35)</td><td>37 (31–38)</td></tr><tr valign="top"><td>Lung injury score</td><td>3.5 (3.0–4.0)</td><td>3.5 (3.5–3.7)</td><td>3.8 (3.5–4.0)</td><td>3.8 (3.3–3.8)</td><td>–</td><td>–</td><td>–</td><td>3.6 (3.3–4.0)</td></tr><tr valign="top"><td>Any rescue therapy</td><td>91 (74)</td><td>–</td><td>–</td><td>–</td><td>35 (97)</td><td>–</td><td>4 (29)</td><td>–</td></tr><tr valign="top"><td>Nitric oxide, %</td><td>72</td><td>19</td><td>32</td><td>15</td><td>89</td><td>–</td><td>7</td><td>–</td></tr><tr valign="top"><td>Prone position, %</td><td>45</td><td>34</td><td>20</td><td>28</td><td>67</td><td>–</td><td>21</td><td>–</td></tr><tr valign="top"><td>Duration of ECMO, days</td><td>11 (8–22)</td><td>9 (6–12)</td><td>10 (7–15)</td><td>10 (7–17)</td><td>20 (9–38)</td><td>9 ± 1</td><td>9 (4–11)</td><td>16 (9–30)</td></tr><tr valign="top"><td>Mortality, n (%)</td><td>44 (36)</td><td>22 (28)</td><td>17 (25)</td><td>14 (29)</td><td>6 (17)</td><td>6 (40)</td><td>9 (64)</td><td>2 (15)</td></tr></tbody></table><table-wrap-foot><p>BMI: body mass index; SOFA: sequential organ failure assessment; MV: mechanicalventilation.</p><p>Data are given as mean ± SD or median (interquartile range).</p><p><sup>$</sup>Winter 2009–2010: 73 patients, winter 2010–2011: 50 patients.</p><p><sup>£</sup>80 patients were transferred to Leicester for consideration to receive ECMO and 69 received thedevice.</p></table-wrap-foot></table-wrap><table-wrap id="Tab5"><label>Table 5</label><caption><p><bold>Studies of ECMO for H1N1-associated ARDS reporting on ≤ 10 patients</bold></p></caption><table frame="hsides" rules="groups"><thead><tr valign="top"><th></th><th><bold>Roncon [</bold><xref ref-type="bibr" rid="CR42">42</xref><bold>]</bold></th><th><bold>D’Ancona [</bold><xref ref-type="bibr" rid="CR38">38</xref><bold>]</bold></th><th><bold>Roch [</bold><xref ref-type="bibr" rid="CR41">41</xref><bold>]</bold></th><th><bold>Hou [</bold><xref ref-type="bibr" rid="CR45">45</xref><bold>]</bold></th><th><bold>Bonastre [</bold><xref ref-type="bibr" rid="CR47">47</xref><bold>]</bold></th><th><bold>Turner [</bold><xref ref-type="bibr" rid="CR44">44</xref><bold>]</bold></th><th><bold>Chan [</bold><xref ref-type="bibr" rid="CR37">37</xref><bold>]</bold></th><th><bold>Freed [</bold><xref ref-type="bibr" rid="CR39">39</xref><bold>]</bold></th></tr></thead><tbody><tr valign="top"><td>Country</td><td>Portugal</td><td>Italy</td><td>France</td><td>China</td><td>Spain</td><td>USA</td><td>Hong Kong</td><td>Canada</td></tr><tr valign="top"><td>Patients, n</td><td>10</td><td>10</td><td>9</td><td>9</td><td>9</td><td>7</td><td>7</td><td>6</td></tr><tr valign="top"><td>Study design</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td></tr><tr valign="top"><td>Number of centers</td><td>1</td><td>1</td><td>1</td><td>1</td><td>5</td><td>1</td><td>3</td><td>4</td></tr><tr valign="top"><td>Age, years</td><td>40 (36–47)</td><td>36 (23–55)</td><td>49 (26–57)</td><td>31 ± 11</td><td>36 (28–42)</td><td>24 (16–25)</td><td>42 (39–50)</td><td>33 ± 7</td></tr><tr valign="top"><td>BMI, kg/m<sup>2</sup></td><td>–</td><td>26 (21–48)</td><td>30 (25–80)</td><td>–</td><td>–</td><td>27 (26–29)</td><td>26 (26–27)</td><td>33 ± 7</td></tr><tr valign="top"><td>Pregnant or postpartum</td><td>1(10)</td><td>0 (0)</td><td>1 (11)</td><td>4 (44)</td><td>–</td><td>1 (14)</td><td>0 (0)</td><td>–</td></tr><tr valign="top"><td>SOFA</td><td>–</td><td>–</td><td>9 (8–10)</td><td>–</td><td>–</td><td>–</td><td>–</td><td>–</td></tr><tr valign="top"><td>Interval MV-ECMO, d</td><td>6.5 (2.2–12.2)</td><td>–</td><td>0.5 (0.25–4.0)</td><td>6 (2–10)</td><td>5 (2–7)</td><td>6.0 (1.5–12.5)</td><td>–</td><td>5.0 (2.5–8.3)</td></tr><tr valign="top"><td>Pre-ECMO parameter</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr valign="top"><td>pH</td><td>7.33 (7.28–7.38)</td><td>–</td><td>7.17 (7.04–7.25)</td><td>–</td><td></td><td>–</td><td>7.30 (7.19–7.36)</td><td>7.31 ± 0.05</td></tr><tr valign="top"><td>PaO<sub>2</sub>/FiO<sub>2</sub>, mmHg</td><td>69 (56–84)</td><td>–</td><td>52 (50–60)</td><td>53 (45–64)</td><td>66 (64–102)</td><td>57 (51–62)</td><td>56 (53–71)</td><td>58 ± 17</td></tr><tr valign="top"><td>Plateau pressure, mmHg</td><td>35 (32–36)</td><td>–</td><td>31 (30–35)</td><td>–</td><td>–</td><td>–</td><td>33 (30–35)<sup>*</sup></td><td>44 ± 42<sup>*</sup></td></tr><tr valign="top"><td>Lung injury score</td><td>3.5 (3.3–3.8)</td><td>–</td><td>3.6 (3.3–3.7)</td><td>3.6 (3.25–3.75)</td><td>–</td><td>–</td><td>3.8 (3.8–3.9)</td><td>–</td></tr><tr valign="top"><td>Any rescue therapy, %</td><td>70</td><td>100</td><td>–</td><td>–</td><td>–</td><td>100</td><td>14</td><td>100</td></tr><tr valign="top"><td>Nitric oxide, %</td><td>60</td><td>–</td><td>67</td><td>–</td><td></td><td>100</td><td>0</td><td>67</td></tr><tr valign="top"><td>Prone position, %</td><td>10</td><td>–</td><td>22</td><td>–</td><td></td><td>0</td><td>14</td><td>33</td></tr><tr valign="top"><td>Duration of ECMO, days</td><td>22 (14–32)</td><td>–</td><td>9 (4–14)</td><td>18 (3–90)</td><td>6 (5–22)</td><td>13 (8–37)</td><td>6 (6–10)</td><td>15 (14–15)</td></tr><tr valign="top"><td>Mortality, n (%)</td><td>4 (40)</td><td>5 (50)</td><td>5 (56)</td><td>4 (44)</td><td>5 (56)</td><td>2 (28)</td><td>1 (14)</td><td>2 (33)</td></tr></tbody></table><table-wrap-foot><p>BMI: Body mass index; SOFA: Sequential Organ Failure Assessment; MV: mechanical ventilation;</p><p>Data are given as mean ± SD or median (interquartile range). *Peak pressure.</p></table-wrap-foot></table-wrap><table-wrap id="Tab6"><label>Table 6</label><caption><p><bold>Studies reporting on ECCO</bold><sub><bold>2</bold></sub><bold>R for ARDS</bold></p></caption><table frame="hsides" rules="groups"><thead><tr valign="top"><th></th><th><bold>Gattinoni [</bold><xref ref-type="bibr" rid="CR67">67</xref><bold>]</bold></th><th><bold>Morris [</bold><xref ref-type="bibr" rid="CR14">14</xref><bold>]</bold></th><th><bold>Bein [</bold><xref ref-type="bibr" rid="CR11">11</xref><bold>]</bold></th><th><bold>Flörchinger [</bold><xref ref-type="bibr" rid="CR69">69</xref><bold>]</bold></th><th><bold>Brunet [</bold><xref ref-type="bibr" rid="CR87">87</xref><bold>]</bold></th><th><bold>Muellenbach [</bold><xref ref-type="bibr" rid="CR88">88</xref><bold>]</bold></th><th><bold>Nierhaus [</bold><xref ref-type="bibr" rid="CR89">89</xref><bold>]</bold></th><th><bold>Cho [</bold><xref ref-type="bibr" rid="CR90">90</xref><bold>]</bold></th><th><bold>Conrad [</bold><xref ref-type="bibr" rid="CR91">91</xref><bold>]</bold></th><th><bold>Iglesias [</bold><xref ref-type="bibr" rid="CR68">68</xref><bold>]</bold></th></tr></thead><tbody><tr valign="top"><td>Country</td><td>Italy</td><td>USA</td><td>Germany</td><td>Germany</td><td>France</td><td>Germany</td><td>Germany</td><td>Korea</td><td>USA</td><td>Spain</td></tr><tr valign="top"><td>Design</td><td>Case series</td><td>RCT</td><td>RCT</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td><td>Case series</td></tr><tr valign="top"><td>Prospective</td><td>Y</td><td>Y</td><td>Y</td><td>Y</td><td>Y</td><td>N</td><td>N</td><td>Y</td><td>Y</td><td>Y</td></tr><tr valign="top"><td>Setting</td><td>Single</td><td>Mulit</td><td>Multi</td><td>Single</td><td>Single</td><td>Single</td><td>Single</td><td>Single</td><td>Multi</td><td>Single</td></tr><tr valign="top"><td>Quality assessment<sup>§</sup></td><td>–</td><td>RCT5</td><td>RCT6</td><td>–</td><td>–</td><td>–</td><td>–</td><td>–</td><td>–</td><td>–</td></tr><tr valign="top"><td>Type of CO<sub>2</sub> removal device, AV/VV</td><td>VV</td><td>VV</td><td>AV</td><td>AV</td><td>VV</td><td>AV</td><td>AV</td><td>AV</td><td>AV</td><td>AV</td></tr><tr valign="top"><td>Patients received ECCO<sub>2</sub>R, n</td><td>43</td><td>21</td><td>40</td><td>159</td><td>23</td><td>22</td><td>13</td><td>11</td><td>8</td><td>7</td></tr><tr valign="top"><td>Years</td><td>1980–1985</td><td>1987–1991</td><td>2007–2010</td><td>1996–2007</td><td>1989–1991</td><td>2002–2006</td><td>–</td><td>2010</td><td>1997–1999</td><td>2005–2006</td></tr><tr valign="top"><td>Age, years</td><td></td><td></td><td>50 ± 12</td><td>44 ± 17</td><td>29 ± 10</td><td>38 ± 15</td><td>52 ± 19</td><td>58 ± 15</td><td>44 ± 8</td><td>53.7 ± 16.0</td></tr><tr valign="top"><td>SOFA score</td><td></td><td></td><td>–</td><td>159</td><td>15 ± 5</td><td>–</td><td>–</td><td>8.8 ± 1.8</td><td>–</td><td>–</td></tr><tr valign="top"><td>Pre-CO<sub>2</sub> removal</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr valign="top"><td>PO<sub>2</sub>/FiO<sub>2</sub>, mmHg</td><td>67</td><td></td><td>152 ± 37</td><td>72 ± 37</td><td>84 ± 30</td><td>61 (47–85)<sup>$</sup></td><td>100 ± 29</td><td>110 ± 36.6</td><td>–</td><td>90</td></tr><tr valign="top"><td>PCo<sub>2</sub>, mmHg</td><td>49 ± 11</td><td></td><td>57 ± 12</td><td>65 ± 24</td><td>56 ± 20</td><td>65 (54–72)<sup>$</sup></td><td>80 ± 23</td><td>84 ± 23</td><td>90.8 ± 7.5</td><td>70</td></tr><tr valign="top"><td>Plateau pressure, cmH<sub>2</sub>O</td><td>–</td><td></td><td>29 ± 5</td><td>37 ± 6*</td><td>51 ± 9*</td><td>40 (36–46)*<sup>$</sup></td><td>34 ± 3*</td><td>30.1 ± 7.1</td><td>–</td><td>22.0 ± 7.4</td></tr><tr valign="top"><td>Lung injury score</td><td>–</td><td></td><td>2.8 ± 0.7</td><td>–</td><td>3.4 ± 0.4</td><td>3.5 (3–3.7)</td><td>–</td><td>–</td><td>–</td><td>2.9 ± 0.3</td></tr><tr valign="top"><td>Delay MV – extracorporeal CO<sub>2</sub> removal, days</td><td>–</td><td></td><td><7</td><td>7 ± 13</td><td>9.2 ± 7.7</td><td>1 (0.5–1.9)</td><td>9.4 ± 10.2</td><td>8.6 ± 12.6</td><td>–</td><td>4 ± 2</td></tr><tr valign="top"><td>Post-cannulation PCo<sub>2</sub> (24 h), mmHg</td><td>–</td><td></td><td>–</td><td>35 ± 7</td><td>41 ± 7</td><td>39 (36–42)<sup>$</sup></td><td>54 ± 19</td><td>40.7 ± 10.2</td><td>51.8 ± 3.1</td><td>45</td></tr><tr valign="top"><td>Length of CO<sub>2</sub> removal device, days</td><td>8 ± 5</td><td></td><td>7.4 ± 4.0</td><td>8 ± 6</td><td>13 (1–55)</td><td>5.3 (3.2–8.2)</td><td>12 ± 22</td><td>8.6 ± 9.4</td><td>–</td><td>4.3 ± 2.5</td></tr><tr valign="top"><td>Serious complication, n (%)</td><td>3 (7)</td><td></td><td>3 (7)</td><td>25 (16)</td><td>5 (22)</td><td>5 (23)</td><td>2 (15)</td><td>3 (27)</td><td>0 (0)</td><td>1 (14</td></tr><tr valign="top"><td>Ischemia lower limb</td><td>–</td><td></td><td>1 (2)</td><td>13 (8)</td><td>–</td><td>3 (14)</td><td>0</td><td>0</td><td>0</td><td>0</td></tr><tr valign="top"><td>Compartmental syndrome</td><td>–</td><td></td><td>–</td><td>4 (2.5)</td><td>–</td><td>1 (4)</td><td>0</td><td>0</td><td>0</td><td>0</td></tr><tr valign="top"><td>Cannula thrombosis</td><td>–</td><td></td><td>–</td><td>8 (5)</td><td>–</td><td>–</td><td>0</td><td>0</td><td>0</td><td>1</td></tr><tr valign="top"><td>Mortality, n (%)</td><td>22 (51)</td><td>7 (33)</td><td>7 (17)</td><td>104 (65)</td><td>12 (52)</td><td>6 (27)</td><td>7 (54)</td><td>9 (82)</td><td>4 (50)</td><td>1 (14)</td></tr></tbody></table><table-wrap-foot><p>AV: arteriovenous; VV: veno-venous; Multi: multicenter; MV: mechanical ventilation; N: no; RCT: randomized controlled trial; SOFA: Sequential Organ Failure Assessment; Y: yes; <sup>*</sup>Peak pressure; <sup>§</sup>RCT quality was graded using a nine-point scale combining elements from Jadad’s [<xref ref-type="bibr" rid="CR21">21</xref>] and Chalmers’ scales [<xref ref-type="bibr" rid="CR23">23</xref>,<xref ref-type="bibr" rid="CR24">24</xref>] whereas the validity of case-controlled studies was appraised with the Newcastle-Ottawa scale [<xref ref-type="bibr" rid="CR25">25</xref>]. Data are given as mean ± SD or median (interquartile range).</p></table-wrap-foot></table-wrap></p></sec><sec id="Sec8"><title>ECMO and ARDS: studies of historical interest</title><p>In 1968, Kolobow et al. developed the first membrane oxygenator for long-term extracorporeal oxygenation [<xref ref-type="bibr" rid="CR5">5</xref>]. Three years later, Donald Hill and colleagues described the first use of an ECMO device for acute respiratory failure in humans [<xref ref-type="bibr" rid="CR4">4</xref>]. They reported on a 24-year-old polytrauma patient, who survived after 75 hours of veno-arterial ECMO. In cohort studies published up to the mid-2000s, the oldest ECMO technology combining roller pump, silicone membrane oxygenator and blood reservoir was used. Survival was 50% in a cohort of 1,473 patients (1986 to 2006, mean age 34 years, 78% had VV-ECMO) from the Extracorporeal Life Support Organization (ELSO) registry [<xref ref-type="bibr" rid="CR26">26</xref>]. In that report, survival was comparable across study periods, although age and severity of disease were significantly higher for the most recent patients. Similarly, Hemmila et al. from Michigan University reported a survival of 52% in 255 adult patients treated with ECMO between 1989 and 2003 [<xref ref-type="bibr" rid="CR27">27</xref>]. Other case–control studies reported similar survival rates for patients treated with ECMO [<xref ref-type="bibr" rid="CR28">28</xref>,<xref ref-type="bibr" rid="CR29">29</xref>]. Interestingly, in a cohort of 150 patients with ARDS (mean age 42 years, mean SAPS II 45), of whom 32 received ECMO as a rescue therapy, ECMO support was not independently associated with a higher mortality [<xref ref-type="bibr" rid="CR30">30</xref>].</p></sec><sec id="Sec9"><title>ECMO and ARDS: results of randomized controlled trials</title><p>Over the last 30 years, only two RCTs of ECMO for ARDS patients have been conducted [<xref ref-type="bibr" rid="CR13">13</xref>,<xref ref-type="bibr" rid="CR18">18</xref>]. The National Institutes of Health (NIH) performed the first multicenter trial in the 1970s, enrolling 90 patients with severe ARDS refractory to conventional ventilation [<xref ref-type="bibr" rid="CR13">13</xref>], of whom 42 received ECMO. Survival was extremely low (<10%) and not different between groups. However, that study suffered from major methodological limitations. For example, the mode of ECMO support was only veno-arterial and when no improvement was observed after 5 days, ECMO was removed, which precluded the possibility of late clinical improvement. Because the ECMO group did not receive lung-protective ventilation, severe complications related to barotrauma occurred and since ECMO circuitry was not heparin-coated at that time, a very high percentage of patients had severe hemorrhagic complications due to excessive anticoagulation.</p><p>The most recent trial (CESAR), which was conducted in the UK from 2001 to 2006, evaluated a strategy of transfer to a single center (Glenfield, Leicester) that had ECMO capability while the patients randomized to the control group were treated conventionally at designated treatment centers [<xref ref-type="bibr" rid="CR18">18</xref>]. The primary endpoint combining mortality or severe disability 6 months after randomization was lower for the 90 patients randomized to the ECMO group (37% vs. 53%, p = 0.03). However, the results of that trial should be analyzed carefully. First, 22 patients randomized to the ECMO arm did not receive ECMO (died before or during transport, improved with conventional management at the referral center or had a contraindication to heparin). Second, no standardized protocol for lung-protective mechanical ventilation existed in the control group and the time spent receiving ‘protective’ mechanical ventilation was significantly higher in the ECMO arm. Third, more patients received corticosteroids in the ECMO group.</p></sec><sec id="Sec10"><title>ECMO and ARDS: retrospective series using the latest technology</title><p>In the most recent series, patients benefited from the latest ECMO technology, which includes a centrifugal pump, a polymethylpentene membrane oxygenator and tubing with biocompatible surface treatment. Mortality rates range from 36 to 56% in the studies performed in the last 15 years and reporting outcomes of >30 ECMO patients (Tables <xref rid="Tab1" ref-type="table">1</xref> and <xref rid="Tab2" ref-type="table">2</xref>). Interestingly, ECMO was provided through a mobile ECMO rescue team in some of these studies. For example, in a series of 124 patients treated at a Danish center between 1997 and 2011 [<xref ref-type="bibr" rid="CR31">31</xref>], survival was 71% and 85% of these patients received ECMO via a mobile unit before being transferred to the referral hospital. Similarly, in the Regensburg cohort, 59/176 received ECMO at another hospital by a mobile unit [<xref ref-type="bibr" rid="CR32">32</xref>]. In a multicenter French cohort of 140 patients treated between 2008 and 2012, 68% patients were retrieved via a mobile ECMO team and their prognosis was comparable to those who received VV-ECMO support in their initial hospital [<xref ref-type="bibr" rid="CR33">33</xref>].</p><p>ECMO support may also cause frequent, severe and potentially life-threatening complications (Table <xref rid="Tab2" ref-type="table">2</xref>), such as bleeding, infections, intravascular hemolysis, thrombocytopenia or consumption coagulopathy [<xref ref-type="bibr" rid="CR26">26</xref>,<xref ref-type="bibr" rid="CR33">33</xref>-<xref ref-type="bibr" rid="CR36">36</xref>].</p></sec><sec id="Sec11"><title>Results of ECMO for pandemic influenza A (H1N1)-associated ARDS</title><p>Mortality rates ranged from 14 to 64% in the 16 studies from 11 countries reporting on the experience of ECMO for influenza A(H1N1)-associated ARDS (Tables <xref rid="Tab4" ref-type="table">4</xref> and <xref rid="Tab5" ref-type="table">5</xref>) [<xref ref-type="bibr" rid="CR15">15</xref>-<xref ref-type="bibr" rid="CR17">17</xref>,<xref ref-type="bibr" rid="CR33">33</xref>,<xref ref-type="bibr" rid="CR37">37</xref>-<xref ref-type="bibr" rid="CR48">48</xref>]. The Australia and New Zealand collaborative group (ANZICS) was the first to report its experience [<xref ref-type="bibr" rid="CR15">15</xref>]. Despite extreme disease severity at the time of ECMO initiation (median PaO<sub>2</sub>/FiO<sub>2</sub> ratio 56 mmHg, median positive end-expiratory pressure [PEEP] 18 cmH<sub>2</sub>O and median lung injury score [LIS] of 3.8), only 25% of the 68 ECMO patients died. A British collaborative cohort series [<xref ref-type="bibr" rid="CR16">16</xref>] depicted the outcome of 80 patients transferred into ECMO referral centers in the United Kingdom of whom 69 received ECMO. Mortality in this cohort was 27.5%. A propensity-matched analysis comparing survival of patients referred for consideration of ECMO to other ARDS patients showed better outcomes for referred patients. By contrast, mortality of propensity-matched patients treated conventionally was comparable to that of ECMO patients in French ICUs of the REVA network. However, only 50% of ECMO patients were successfully matched with control ARDS patients, while unmatched ECMO patients were younger, suffered more severe respiratory failure and had considerably lower mortality [<xref ref-type="bibr" rid="CR17">17</xref>]. Interestingly, a higher plateau pressure under ECMO was independently associated with mortality, indicating for the first time that an ultraprotective ventilation strategy with reduction of plateau pressure to around 25 cmH<sub>2</sub>O following ECMO installation might improve outcomes. Lastly, mortality was 29% in a cohort of 49 proven influenza A(H1N1) patients from the 14 ECMO centers of the ECMO-NET Italian collaborative group [<xref ref-type="bibr" rid="CR48">48</xref>]. In this series, patients ventilated for less than 7 days before ECMO initiation had a significantly higher survival.</p></sec><sec id="Sec12"><title>Mortality risk factors and outcome prediction for ECMO candidates</title><p>Factors associated with poor outcomes after ECMO for acute respiratory failure include older age [<xref ref-type="bibr" rid="CR26">26</xref>,<xref ref-type="bibr" rid="CR27">27</xref>,<xref ref-type="bibr" rid="CR30">30</xref>,<xref ref-type="bibr" rid="CR32">32</xref>,<xref ref-type="bibr" rid="CR33">33</xref>,<xref ref-type="bibr" rid="CR49">49</xref>,<xref ref-type="bibr" rid="CR50">50</xref>], a greater number of days of mechanical ventilation before ECMO establishment [<xref ref-type="bibr" rid="CR26">26</xref>,<xref ref-type="bibr" rid="CR27">27</xref>,<xref ref-type="bibr" rid="CR30">30</xref>,<xref ref-type="bibr" rid="CR33">33</xref>,<xref ref-type="bibr" rid="CR50">50</xref>], a higher number of organ failures [<xref ref-type="bibr" rid="CR26">26</xref>,<xref ref-type="bibr" rid="CR27">27</xref>,<xref ref-type="bibr" rid="CR30">30</xref>,<xref ref-type="bibr" rid="CR32">32</xref>,<xref ref-type="bibr" rid="CR33">33</xref>,<xref ref-type="bibr" rid="CR49">49</xref>,<xref ref-type="bibr" rid="CR50">50</xref>], low pre-ECMO respiratory system compliance [<xref ref-type="bibr" rid="CR50">50</xref>], and immunosuppression [<xref ref-type="bibr" rid="CR33">33</xref>,<xref ref-type="bibr" rid="CR50">50</xref>,<xref ref-type="bibr" rid="CR51">51</xref>]. Predictive survival models have been recently developed that might help clinicians select appropriate candidates for ECMO [<xref ref-type="bibr" rid="CR33">33</xref>,<xref ref-type="bibr" rid="CR49">49</xref>-<xref ref-type="bibr" rid="CR52">52</xref>]. For example, the Respiratory Extracorporeal Membrane Oxygenation Survival (RESP) score [<xref ref-type="bibr" rid="CR50">50</xref>], constructed on data extracted from a large multicenter international population (n = 2,355), computes 12 simple pre-ECMO parameters, to provide a relevant and validated tool predicting survival after ECMO for acute respiratory failure. Cumulative predicted hospital survival rates were 92, 76, 57, 33 and 18% for five RESP-score risk classes, I (≥ 6), II (3 to 5), III (−1 to 2), IV (−5 to −2) and V (≤ -6), respectively.</p></sec><sec id="Sec13"><title>Volume-outcome effect and ECMO activity organization</title><p>Recent analyses of large pediatric databases have suggested a significant relationship between the volume of patients treated by center and ECMO patient prognosis [<xref ref-type="bibr" rid="CR53">53</xref>-<xref ref-type="bibr" rid="CR55">55</xref>]. ECMO case-series published after the pandemic influenza A(H1N1) might also allow a comparative analysis of worldwide results obtained for a very homogeneous disease (Tables <xref rid="Tab4" ref-type="table">4</xref> and <xref rid="Tab5" ref-type="table">5</xref>). These data suggest that the best results were obtained for patients managed in expert centers treating a sufficient number of patients and in countries where ECMO activity was organized and regulated, as was the case in the United Kingdom [<xref ref-type="bibr" rid="CR56">56</xref>], Italy [<xref ref-type="bibr" rid="CR57">57</xref>] and in Australia and New Zealand [<xref ref-type="bibr" rid="CR58">58</xref>]. A recent position paper [<xref ref-type="bibr" rid="CR59">59</xref>] by an international group of physicians with expertise in ECMO for severe respiratory failure advocated for regional and inter-regional organization of ECMO activity through networks of hospitals around an ECMO referral center with a mobile ECMO unit [<xref ref-type="bibr" rid="CR34">34</xref>,<xref ref-type="bibr" rid="CR60">60</xref>,<xref ref-type="bibr" rid="CR61">61</xref>] to retrieve the most severe ARDS patients. This group also suggested that at least 20 ECMO cases should be performed per year at each referral center [<xref ref-type="bibr" rid="CR59">59</xref>]. Furthermore, high volume and expert referral centers may provide better prevention and management of the severe complications that can occur during long ECMO runs (Table <xref rid="Tab2" ref-type="table">2</xref>).</p></sec><sec id="Sec14"><title>Long term outcomes after ECMO</title><p>Durations of intensive care and hospital stays of ECMO patients are long and frequently exceed one month [<xref ref-type="bibr" rid="CR26">26</xref>], [<xref ref-type="bibr" rid="CR33">33</xref>]. Thus, evaluation of the impact of such complex therapy on long-term pulmonary function, quality of life and psychological status appears crucial in the decision process to use ECMO in ARDS patients. To date, long-term prognosis after ECMO for ARDS has rarely been evaluated. Linden et al. reported long-term outcomes of 21 ARDS survivors rescued with ECMO [<xref ref-type="bibr" rid="CR62">62</xref>]. In this study, most of the patients had limited fibrosis lesions on CT scan. Respiratory function tests were within normal limits. However, patients reported deterioration in pulmonary symptoms measured by the St George Respiratory Questionnaire, although these symptoms were comparable to those reported in other series of ARDS patients treated conventionally. Similarly, patients in the ECMO arm of the CESAR trial [<xref ref-type="bibr" rid="CR18">18</xref>] exhibited comparable or better health-related quality of life scores (measured by the SF-36 questionnaire) than those reported by patients with ARDS treated with conventional management [<xref ref-type="bibr" rid="CR63">63</xref>,<xref ref-type="bibr" rid="CR64">64</xref>]. Exertional dyspnea was reported by 50% and 40% of 12 influenza A(H1N1) ECMO patients and 25 controls, respectively [<xref ref-type="bibr" rid="CR65">65</xref>]. Anxiety and depressive symptoms were reported by 50% and 28% of ECMO patients, respectively, whereas 41% were at risk of post-traumatic stress disorder (PTSD) [<xref ref-type="bibr" rid="CR65">65</xref>]. By contrast, results of the Melbourne group were poorer, with only 26% of long-term survivors having returned to their previous work at eight-month-follow-up [<xref ref-type="bibr" rid="CR66">66</xref>]. Similar to previous studies, mean SF-36 scores in the ECMO population were lower than these previously described with ARDS survivors in the domains of general health, mental health, vitality and social function. Lastly, the largest study published to date was reported by Schmidt et al. [<xref ref-type="bibr" rid="CR33">33</xref>] on a population of 84 6-month survivors. In that series, 36% of the patients reported exertional dyspnea, whereas 30% were still receiving pulmonary treatments after a median 17-month follow-up. Health-related quality of life evaluation in 80% of the 6-month survivors revealed satisfactory mental health but persistent physical and emotional-related difficulties, with anxiety, depression or PTSD symptoms reported by 34, 25 and 16%, respectively.</p></sec><sec id="Sec15"><title>Results of extracorporeal CO<sub>2</sub> removal techniques for ARDS patients</title><p>To date, studies on ECCO<sub>2</sub>R in ARDS patients are scarce and mostly small retrospective case series (Table <xref rid="Tab6" ref-type="table">6</xref>). Gattinoni et al. reported in 1986 the first cohort of 43 patients with severe ARDS treated with veno-venous, low flow (200–300 ml/min) ECCO<sub>2</sub>R, which needed a boot volume of almost two liters of blood [<xref ref-type="bibr" rid="CR67">67</xref>]. In this series, ECCO<sub>2</sub>R duration was 5 days, daily blood losses were large (> 1,800 ml/24 hours) and survival was 49%. A randomized study using the same technology was carried out in the early 1990s by Morris et al. [<xref ref-type="bibr" rid="CR14">14</xref>]. It was stopped for futility after the enrolment of only 40 patients and mortality was 67% in the 21 patients randomized to ECCO<sub>2</sub>R. In the 2000s, case series, which used the pumpless arteriovenous shunt (extracorporeal interventional lung assist, iLA, Novalung®, Heilbronn, Germany) were published. Iglesias et al. [<xref ref-type="bibr" rid="CR68">68</xref>] reported the outcome of seven patients with ARDS after pneumonectomy. The ECCO<sub>2</sub>R device was left in place for four days, CO<sub>2</sub> removal was 255 ml/min allowing significant reduction in tidal volume and 6/7 patients survived (Table <xref rid="Tab6" ref-type="table">6</xref>). In a larger German cohort of 156 patients, a higher mortality was reported (65%). Of note, 16% of the patients experienced serious complications in that cohort, particularly leg ischemia related to femoral arterial cannulation and need for higher dose catecholamines (Table <xref rid="Tab6" ref-type="table">6</xref>) [<xref ref-type="bibr" rid="CR69">69</xref>].</p><p>The concept of ultraprotective mechanical ventilation was tested in a proof-of concept trial, with CO<sub>2</sub> removal performed by a modified veno-venous hemofiltration platform. In 10 patients with plateau pressure of 28–30 cmH<sub>2</sub>O at baseline, ECCO<sub>2</sub>R allowed a reduction of tidal volume (from 6 to 4 ml/kg) and of plateau pressure (from 29 to 25 cmH<sub>2</sub>O), while maintaining PaCO<sub>2</sub> around 50 mmHg [<xref ref-type="bibr" rid="CR19">19</xref>]. This protective ventilation strategy was also associated with a significant reduction in pro-inflammatory cytokine levels in bronchoalveolar (BAL) fluid. This ultraprotective ventilation strategy was recently evaluated in the Xtravent trial [<xref ref-type="bibr" rid="CR11">11</xref>], which randomized 79 patients to conventional mechanical ventilation using the ARDSNet strategy [<xref ref-type="bibr" rid="CR70">70</xref>] or to tidal volume reduction to 3 ml/kg permitted by CO<sub>2</sub> removal with the Novalung AV pumpless ECCO<sub>2</sub>R device. The numbers of ventilator-free days at day 60 were not different between groups. However, a post-hoc subgroup analysis revealed that patients with lower PaO<sub>2</sub>/FiO<sub>2</sub> (≤ 150 mmHg) at randomization had significantly more ventilator-free days at days 28 and 60 and were more rapidly weaned from mechanical ventilation.</p></sec></sec><sec id="Sec16"><title>Conclusion and perspectives</title><p>We report the results of 56 studies (including 4 RCTs) evaluating extracorporeal gas exchange techniques (ECMO or ECCO<sub>2</sub>-R) to treat moderate to severe acute respiratory failure in adult patients. Major heterogeneity in study populations, disease severity, type of device used and time at which studies were performed creates insuperable hurdles to design relevant meta-analyses. Results of the most recent randomized CESAR trial, which was conducted in the UK from 2001 to 2006, suggested that a strategy of transfer to an ECMO referral center for consideration to receive ECMO was associated with better outcomes. However, that trial was highly criticized for methodological limitations. Additionally, non-randomized case-series of ECMO, including propensity-matched case–control studies, are prone to important selection biases weakening interpretation of their results. Although early implementation of VV-ECMO in severe ARDS patients might allow significant reduction in ventilator-induced lung injury (VILI) and may rescue patients dying of refractory hypoxemia, more evidence is urgently needed to evaluate the actual impact of the technique on patient-centered outcomes compared to optimization of conventional treatments, including prone positioning [<xref ref-type="bibr" rid="CR2">2</xref>]. This is the main objective of the ongoing international multicenter randomized Extracorporeal Membrane Oxygenation for Severe Acute Respiratory Distress Syndrome (EOLIA) trial (ClinicalTrials.gov Identifier: NCT01470703), which will test the efficacy of early VV-ECMO in patients with severe ARDS with tight control of mechanical ventilation in the control group, initiation of ECMO prior to transportation to ECMO centers, and the use of ECMO in every patient randomly assigned to receive it [<xref ref-type="bibr" rid="CR71">71</xref>].</p><p>Pathophysiological, experimental and clinical data suggest that an ‘ultraprotective’ mechanical ventilation strategy reducing tidal volume to 3–4 ml/kg predicted body weight and plateau pressure to < 25 cmH<sub>2</sub>O may further reduce VILI and ARDS-associated morbidity and mortality in less severe ARDS patients. Hypercapnia induced by tidal volume reduction in this setting might be efficiently controlled by the latest generation low-flow, venovenous ECCO<sub>2</sub>R devices, which are more efficient, more biocompatible and associated with fewer hemorrhagic complications because they require less anticoagulation than devices evaluated in the 1980s and 90s, which did not achieve significant mortality reduction. However, the uncritical and large adoption of this strategy is premature and problematic without rigorous evaluation of associated risks and benefits. This will be the objective of the large randomized Strategy of Ultra Protective lung ventilation with Extracorporeal CO<sub>2</sub> Removal for New-Onset moderate to severe ARDS (SUPERNOVA) trial, which will test the benefits of early tidal volume and plateau pressure reduction allowed by the latest generation ECCO<sub>2</sub>R device in patients with moderate forms of ARDS [<xref ref-type="bibr" rid="CR72">72</xref>].</p><p>Lastly, future studies of extracorporeal gas exchange should also include detailed evaluation of physical and psychosocial rehabilitation that could lead to improved long-term health-related quality of life in this population of patients.</p></sec></body><back><glossary><title>Abbreviations</title><def-list><def-item><term>ARDS</term><def><p>Acute respiratory distress syndrome</p></def></def-item><def-item><term>AV</term><def><p>Arteriovenous</p></def></def-item><def-item><term>BMI</term><def><p>Body mass index</p></def></def-item><def-item><term>ECCO<sub>2</sub>R</term><def><p>Extracorporeal carbon dioxide removal</p></def></def-item><def-item><term>ECMO</term><def><p>Extracorporeal membrane oxygenation</p></def></def-item><def-item><term>ELSO</term><def><p>Extracorporeal life support organization</p></def></def-item><def-item><term>ICU</term><def><p>Intensive care unit</p></def></def-item><def-item><term>LIS</term><def><p>Lung injury score</p></def></def-item><def-item><term>MV</term><def><p>Mechanical ventilation</p></def></def-item><def-item><term>PEEP</term><def><p>Positive end-expiratory pressure</p></def></def-item><def-item><term>PRISMA</term><def><p>Preferred reporting items for systematic reviews and meta-analyses</p></def></def-item><def-item><term>RCT</term><def><p>Randomized control trial</p></def></def-item><def-item><term>RESP</term><def><p>Respiratory extracorporeal membrane oxygenation survival</p></def></def-item><def-item><term>SOFA</term><def><p>Sequential organ failure assessment</p></def></def-item><def-item><term>VILI</term><def><p>Ventilator-induced lung injury</p></def></def-item><def-item><term>VV</term><def><p>Veno-venous</p></def></def-item></def-list></glossary><fn-group><fn><p><bold>Competing interests</bold></p><p>Pr Combes is the primary investigator of the EOLIA trial, NCT01470703, a randomized trial of VV-ECMO supported in part by MAQUET. Pr Combes has received honoraria for lectures by MAQUET, BAXTER AND ALung. The other authors declare that they have no competing interests.</p></fn></fn-group><ack><title>Acknowledgement</title><p>Matthieu Schmidt was supported by the French Intensive Care Society (SRLF), the “Fonds de dotation Recherche en Santé Respiratoire, 2012”, the “Collège des Enseignants de Réanimation Médicale” and the “Département du Développement professionnel continu médical – Assistance publique-Hôpitaux de Paris”.</p><sec id="FPar1"><title>Declarations</title><p>The publication charges for this article were funded by the corresponding author’s institution.</p></sec></ack><ref-list id="Bib1"><title>References</title><ref id="CR1"><label>1.</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Dreyfuss</surname><given-names>D</given-names></name><name><surname>Soler</surname><given-names>P</given-names></name><name><surname>Basset</surname><given-names>G</given-names></name><name><surname>Saumon</surname><given-names>G</given-names></name></person-group><article-title>High inflation pressure pulmonary edema. 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