Patterns and early evolution of organ failure in the intensive care unit and their relation to outcome
Identifieur interne : 000160 ( Pmc/Corpus ); précédent : 000159; suivant : 000161Patterns and early evolution of organ failure in the intensive care unit and their relation to outcome
Auteurs : Yasser Sakr ; Suzana M. Lobo ; Rui P. Moreno ; Herwig Gerlach ; V Marco Ranieri ; Argyris Michalopoulos ; Jean-Louis VincentSource :
- Critical Care [ 1364-8535 ] ; 2012.
Abstract
Recognition of patterns of organ failure may be useful in characterizing the clinical course of critically ill patients. We investigated the patterns of early changes in organ dysfunction/failure in intensive care unit (ICU) patients and their relation to outcome.
Using the database from a large prospective European study, we studied 2,933 patients who had stayed more than 48 hours in the ICU and described patterns of organ failure and their relation to outcome. Patients were divided into three groups: patients without sepsis, patients in whom sepsis was diagnosed within the first 48 hours after ICU admission, and patients in whom sepsis developed more than 48 hours after admission. Organ dysfunction was assessed by using the sequential organ failure assessment (SOFA) score.
A total of 2,110 patients (72% of the study population) had organ failure at some point during their ICU stay. Patients who exhibited an improvement in organ function in the first 24 hours after admission to the ICU had lower ICU and hospital mortality rates compared with those who had unchanged or increased SOFA scores (12.4 and 18.4% versus 19.6 and 24.5%,
Early changes in organ function are strongly related to outcome. In patients with single-organ failure, in-hospital mortality was higher in sepsis than in nonsepsis patients. However, in multiorgan failure, mortality rates were not influenced by the presence of sepsis.
Url:
DOI: 10.1186/cc11868
PubMed: 23158219
PubMed Central: 3672601
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PMC:3672601Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Patterns and early evolution of organ failure in the intensive care unit and their relation to outcome</title><author><name sortKey="Sakr, Yasser" sort="Sakr, Yasser" uniqKey="Sakr Y" first="Yasser" last="Sakr">Yasser Sakr</name><affiliation><nlm:aff id="I1">Department of Anesthesiology and Intensive Care, Friedrich-Schiller-University, Erlanger Allee 103, 07743 Jena, Germany</nlm:aff></affiliation></author><author><name sortKey="Lobo, Suzana M" sort="Lobo, Suzana M" uniqKey="Lobo S" first="Suzana M" last="Lobo">Suzana M. Lobo</name><affiliation><nlm:aff id="I2">Division of Critical Care Medicine, Department of Internal Medicine, Medical School-FUNFARME and Hospital de Base, São José do Rio Preto, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Moreno, Rui P" sort="Moreno, Rui P" uniqKey="Moreno R" first="Rui P" last="Moreno">Rui P. Moreno</name><affiliation><nlm:aff id="I3">Dunidade de Cuidados Intensivos Neurocriticos, Hospital de São José, Centro Hospitalar de Lisboa Central, E.P.E., Rua José António Serrano, 1150-199 Lisbon, Portugal</nlm:aff></affiliation></author><author><name sortKey="Gerlach, Herwig" sort="Gerlach, Herwig" uniqKey="Gerlach H" first="Herwig" last="Gerlach">Herwig Gerlach</name><affiliation><nlm:aff id="I4">Department of Anesthesia, Intensive Care Medicine, and Pain Management, Vivantes-Klinikum Neukölln, Rudower Strasse 48, D-12313 Berlin, Germany</nlm:aff></affiliation></author><author><name sortKey="Ranieri, V Marco" sort="Ranieri, V Marco" uniqKey="Ranieri V" first="V Marco" last="Ranieri">V Marco Ranieri</name><affiliation><nlm:aff id="I5">Department of Anesthesia and Critical Care, Ospedale S. Giovanni Battista-Molinette, corso Dogliotti 14, 10126, University of Turin, Turin, Italy</nlm:aff></affiliation></author><author><name sortKey="Michalopoulos, Argyris" sort="Michalopoulos, Argyris" uniqKey="Michalopoulos A" first="Argyris" last="Michalopoulos">Argyris Michalopoulos</name><affiliation><nlm:aff id="I6">Intensive Care Unit, Henry Dunant Hospital, Department of Medicine, Athens, Greece</nlm:aff></affiliation></author><author><name sortKey="Vincent, Jean Louis" sort="Vincent, Jean Louis" uniqKey="Vincent J" first="Jean-Louis" last="Vincent">Jean-Louis Vincent</name><affiliation><nlm:aff id="I7">Department of Intensive Care, Erasme Hospital, Université Libre de Bruxelles, Brussels, Route de Lennik 808, 1070 Brussels, Belgium</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">23158219</idno><idno type="pmc">3672601</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3672601</idno><idno type="RBID">PMC:3672601</idno><idno type="doi">10.1186/cc11868</idno><date when="2012">2012</date><idno type="wicri:Area/Pmc/Corpus">000160</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Patterns and early evolution of organ failure in the intensive care unit and their relation to outcome</title><author><name sortKey="Sakr, Yasser" sort="Sakr, Yasser" uniqKey="Sakr Y" first="Yasser" last="Sakr">Yasser Sakr</name><affiliation><nlm:aff id="I1">Department of Anesthesiology and Intensive Care, Friedrich-Schiller-University, Erlanger Allee 103, 07743 Jena, Germany</nlm:aff></affiliation></author><author><name sortKey="Lobo, Suzana M" sort="Lobo, Suzana M" uniqKey="Lobo S" first="Suzana M" last="Lobo">Suzana M. Lobo</name><affiliation><nlm:aff id="I2">Division of Critical Care Medicine, Department of Internal Medicine, Medical School-FUNFARME and Hospital de Base, São José do Rio Preto, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Moreno, Rui P" sort="Moreno, Rui P" uniqKey="Moreno R" first="Rui P" last="Moreno">Rui P. Moreno</name><affiliation><nlm:aff id="I3">Dunidade de Cuidados Intensivos Neurocriticos, Hospital de São José, Centro Hospitalar de Lisboa Central, E.P.E., Rua José António Serrano, 1150-199 Lisbon, Portugal</nlm:aff></affiliation></author><author><name sortKey="Gerlach, Herwig" sort="Gerlach, Herwig" uniqKey="Gerlach H" first="Herwig" last="Gerlach">Herwig Gerlach</name><affiliation><nlm:aff id="I4">Department of Anesthesia, Intensive Care Medicine, and Pain Management, Vivantes-Klinikum Neukölln, Rudower Strasse 48, D-12313 Berlin, Germany</nlm:aff></affiliation></author><author><name sortKey="Ranieri, V Marco" sort="Ranieri, V Marco" uniqKey="Ranieri V" first="V Marco" last="Ranieri">V Marco Ranieri</name><affiliation><nlm:aff id="I5">Department of Anesthesia and Critical Care, Ospedale S. Giovanni Battista-Molinette, corso Dogliotti 14, 10126, University of Turin, Turin, Italy</nlm:aff></affiliation></author><author><name sortKey="Michalopoulos, Argyris" sort="Michalopoulos, Argyris" uniqKey="Michalopoulos A" first="Argyris" last="Michalopoulos">Argyris Michalopoulos</name><affiliation><nlm:aff id="I6">Intensive Care Unit, Henry Dunant Hospital, Department of Medicine, Athens, Greece</nlm:aff></affiliation></author><author><name sortKey="Vincent, Jean Louis" sort="Vincent, Jean Louis" uniqKey="Vincent J" first="Jean-Louis" last="Vincent">Jean-Louis Vincent</name><affiliation><nlm:aff id="I7">Department of Intensive Care, Erasme Hospital, Université Libre de Bruxelles, Brussels, Route de Lennik 808, 1070 Brussels, Belgium</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="2012">2012</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Introduction</title><p>Recognition of patterns of organ failure may be useful in characterizing the clinical course of critically ill patients. We investigated the patterns of early changes in organ dysfunction/failure in intensive care unit (ICU) patients and their relation to outcome.</p></sec><sec><title>Methods</title><p>Using the database from a large prospective European study, we studied 2,933 patients who had stayed more than 48 hours in the ICU and described patterns of organ failure and their relation to outcome. Patients were divided into three groups: patients without sepsis, patients in whom sepsis was diagnosed within the first 48 hours after ICU admission, and patients in whom sepsis developed more than 48 hours after admission. Organ dysfunction was assessed by using the sequential organ failure assessment (SOFA) score.</p></sec><sec><title>Results</title><p>A total of 2,110 patients (72% of the study population) had organ failure at some point during their ICU stay. Patients who exhibited an improvement in organ function in the first 24 hours after admission to the ICU had lower ICU and hospital mortality rates compared with those who had unchanged or increased SOFA scores (12.4 and 18.4% versus 19.6 and 24.5%, <italic>P </italic>< 0.05, pairwise). As expected, organ failure was more common in sepsis than in nonsepsis patients. In patients with single-organ failure, in-hospital mortality was greater in sepsis than in nonsepsis patients. However, in patients with multiorgan failure, mortality rates were similar regardless of the presence of sepsis. Irrespective of the presence of sepsis, delta SOFA scores over the first 4 days in the ICU were higher in nonsurvivors than in survivors and decreased significantly over time in survivors.</p></sec><sec><title>Conclusions</title><p>Early changes in organ function are strongly related to outcome. In patients with single-organ failure, in-hospital mortality was higher in sepsis than in nonsepsis patients. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Crit Care</journal-id><journal-id journal-id-type="iso-abbrev">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></journal-meta><article-meta><article-id pub-id-type="pmid">23158219</article-id><article-id pub-id-type="pmc">3672601</article-id><article-id pub-id-type="publisher-id">cc11868</article-id><article-id pub-id-type="doi">10.1186/cc11868</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research</subject></subj-group></article-categories><title-group><article-title>Patterns and early evolution of organ failure in the intensive care unit and their relation to outcome</article-title></title-group><contrib-group><contrib contrib-type="author" id="A1"><name><surname>Sakr</surname><given-names>Yasser</given-names></name><xref ref-type="aff" rid="I1">1</xref><email>Yasser.Sakr@med.uni-jena.de</email></contrib><contrib contrib-type="author" id="A2"><name><surname>Lobo</surname><given-names>Suzana M</given-names></name><xref ref-type="aff" rid="I2">2</xref><email>suzanalobo@yahoo.com</email></contrib><contrib contrib-type="author" id="A3"><name><surname>Moreno</surname><given-names>Rui P</given-names></name><xref ref-type="aff" rid="I3">3</xref><email>r.moreno@mail.telepac.pt</email></contrib><contrib contrib-type="author" id="A4"><name><surname>Gerlach</surname><given-names>Herwig</given-names></name><xref ref-type="aff" rid="I4">4</xref><email>herwig.gerlach@vivantes.de</email></contrib><contrib contrib-type="author" id="A5"><name><surname>Ranieri</surname><given-names>V Marco</given-names></name><xref ref-type="aff" rid="I5">5</xref><email>marco.ranieri@unito.it</email></contrib><contrib contrib-type="author" id="A6"><name><surname>Michalopoulos</surname><given-names>Argyris</given-names></name><xref ref-type="aff" rid="I6">6</xref><email>amichalopoulos@hol.gr</email></contrib><contrib contrib-type="author" corresp="yes" id="A7"><name><surname>Vincent</surname><given-names>Jean-Louis</given-names></name><xref ref-type="aff" rid="I7">7</xref><email>jlvincen@ulb.ac.be</email></contrib><contrib contrib-type="author" id="A8"><collab>the SOAP Investigators</collab><email>jlvincen@ulb.ac.be</email></contrib></contrib-group><aff id="I1"><label>1</label>Department of Anesthesiology and Intensive Care, Friedrich-Schiller-University, Erlanger Allee 103, 07743 Jena, Germany</aff><aff id="I2"><label>2</label>Division of Critical Care Medicine, Department of Internal Medicine, Medical School-FUNFARME and Hospital de Base, São José do Rio Preto, São Paulo, Brazil</aff><aff id="I3"><label>3</label>Dunidade de Cuidados Intensivos Neurocriticos, Hospital de São José, Centro Hospitalar de Lisboa Central, E.P.E., Rua José António Serrano, 1150-199 Lisbon, Portugal</aff><aff id="I4"><label>4</label>Department of Anesthesia, Intensive Care Medicine, and Pain Management, Vivantes-Klinikum Neukölln, Rudower Strasse 48, D-12313 Berlin, Germany</aff><aff id="I5"><label>5</label>Department of Anesthesia and Critical Care, Ospedale S. Giovanni Battista-Molinette, corso Dogliotti 14, 10126, University of Turin, Turin, Italy</aff><aff id="I6"><label>6</label>Intensive Care Unit, Henry Dunant Hospital, Department of Medicine, Athens, Greece</aff><aff id="I7"><label>7</label>Department of Intensive Care, Erasme Hospital, Université Libre de Bruxelles, Brussels, Route de Lennik 808, 1070 Brussels, Belgium</aff><pub-date pub-type="ppub"><year>2012</year></pub-date><pub-date pub-type="epub"><day>16</day><month>11</month><year>2012</year></pub-date><volume>16</volume><issue>6</issue><fpage>R222</fpage><lpage>R222</lpage><history><date date-type="received"><day>22</day><month>5</month><year>2012</year></date><date date-type="rev-recd"><day>29</day><month>7</month><year>2012</year></date><date date-type="accepted"><day>20</day><month>8</month><year>2012</year></date></history><permissions><copyright-statement>Copyright ©2012 Sakr et al.; licensee BioMed Central Ltd.</copyright-statement><copyright-year>2012</copyright-year><copyright-holder>Sakr et al.; licensee BioMed Central Ltd.</copyright-holder><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/2.0"><license-p>This is an open access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/2.0">http://creativecommons.org/licenses/by/2.0</ext-link>), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><self-uri xlink:href="http://ccforum.com/content/16/6/R222"></self-uri><abstract><sec><title>Introduction</title><p>Recognition of patterns of organ failure may be useful in characterizing the clinical course of critically ill patients. We investigated the patterns of early changes in organ dysfunction/failure in intensive care unit (ICU) patients and their relation to outcome.</p></sec><sec><title>Methods</title><p>Using the database from a large prospective European study, we studied 2,933 patients who had stayed more than 48 hours in the ICU and described patterns of organ failure and their relation to outcome. Patients were divided into three groups: patients without sepsis, patients in whom sepsis was diagnosed within the first 48 hours after ICU admission, and patients in whom sepsis developed more than 48 hours after admission. Organ dysfunction was assessed by using the sequential organ failure assessment (SOFA) score.</p></sec><sec><title>Results</title><p>A total of 2,110 patients (72% of the study population) had organ failure at some point during their ICU stay. Patients who exhibited an improvement in organ function in the first 24 hours after admission to the ICU had lower ICU and hospital mortality rates compared with those who had unchanged or increased SOFA scores (12.4 and 18.4% versus 19.6 and 24.5%, <italic>P </italic>< 0.05, pairwise). As expected, organ failure was more common in sepsis than in nonsepsis patients. In patients with single-organ failure, in-hospital mortality was greater in sepsis than in nonsepsis patients. However, in patients with multiorgan failure, mortality rates were similar regardless of the presence of sepsis. Irrespective of the presence of sepsis, delta SOFA scores over the first 4 days in the ICU were higher in nonsurvivors than in survivors and decreased significantly over time in survivors.</p></sec><sec><title>Conclusions</title><p>Early changes in organ function are strongly related to outcome. In patients with single-organ failure, in-hospital mortality was higher in sepsis than in nonsepsis patients. However, in multiorgan failure, mortality rates were not influenced by the presence of sepsis.</p></sec></abstract></article-meta></front><body><sec><title>Introduction</title><p>Multiple organ failure (MOF) is an evolving clinical syndrome triggered by various stimuli and may be a consequence of tissue hypoperfusion with cellular hypoxia, metabolic dysfunction, and impaired bioenergetic processes [<xref ref-type="bibr" rid="B1">1</xref>]. MOF is the main cause of morbidity and mortality in patients admitted to the intensive care unit (ICU) and is recognized as the final common pathway preceding death in critically ill patients [<xref ref-type="bibr" rid="B2">2</xref>-<xref ref-type="bibr" rid="B4">4</xref>]. Sepsis, a major public health problem, often progresses to MOF [<xref ref-type="bibr" rid="B2">2</xref>,<xref ref-type="bibr" rid="B3">3</xref>], which is believed to increase markedly the risk of death in ICU patients [<xref ref-type="bibr" rid="B2">2</xref>,<xref ref-type="bibr" rid="B3">3</xref>,<xref ref-type="bibr" rid="B5">5</xref>].</p><p>A need exists to evaluate organ function better over time in ICU patients. The Sequential Organ Failure Assessment (SOFA) score [<xref ref-type="bibr" rid="B6">6</xref>-<xref ref-type="bibr" rid="B8">8</xref>] was developed as a tool to describe quantitatively the time course of organ dysfunction [<xref ref-type="bibr" rid="B9">9</xref>,<xref ref-type="bibr" rid="B10">10</xref>]. Changes in SOFA score have been correlated with prognosis (delta SOFA and SOFA max) [<xref ref-type="bibr" rid="B8">8</xref>,<xref ref-type="bibr" rid="B10">10</xref>] and are now widely used to assess the effects of therapeutic interventions [<xref ref-type="bibr" rid="B11">11</xref>,<xref ref-type="bibr" rid="B12">12</xref>]. The aim of our study was to investigate the relation between the patterns of early changes in organ function in the ICU and outcome from critical illness. The study set up the hypothesis that recognition of early changes in organ function may characterize the clinical course of critically ill patients. Moreover, we explored the relative roles of sepsis and MOF in determining outcome in critically ill patients.</p></sec><sec sec-type="materials|methods"><title>Materials and methods</title><p>This study is a subanalysis of the prospective, multicenter, observational study, the sepsis occurrence in acutely ill patients (SOAP) study, which was designed to create a database of ICU patients in European countries. Recruitment, data collection, and management are detailed elsewhere [<xref ref-type="bibr" rid="B2">2</xref>]; in brief, all patients older than 15 years admitted to the 198 participating centers (see the Acknowledgements for a list of participating countries and centers) between May 1 and May 15, 2002, were included. Patients who stayed in the ICU for less than 24 hours for routine postoperative observation were not included. Patients were followed up until death, hospital discharge, or for 60 days. Because the observational SOAP study did not require any deviation from routine medical practice, institutional review board approval was either waived or expedited in participating institutions, and informed consent was not required. As such, no supplementary review-board documents were needed for the current substudy.</p><p>Data were collected prospectively by using preprinted case-report forms. Data collection on admission included demographic data and comorbidities. Clinical and laboratory data for the simplified acute physiology score (SAPS) II [<xref ref-type="bibr" rid="B13">13</xref>] were reported as the worst value within 24 hours after admission. Microbiologic and clinical infections were reported daily, as well as the antibiotics administered. Organ function was evaluated on admission and daily thereafter, by using the SOFA score [<xref ref-type="bibr" rid="B6">6</xref>]. Data were encoded centrally in the organizing center by medical personnel (Department of Intensive Care, Erasme Hospital), and a number of quality control measures were carried out to assure consistency of the data and the quality of data entry [<xref ref-type="bibr" rid="B2">2</xref>]. All variables were defined <italic>a priori</italic>, and definitions were available on an Internet-based website throughout the study period.</p><sec><title>Definitions</title><p>Sepsis syndromes were defined according to consensus conference definitions [<xref ref-type="bibr" rid="B14">14</xref>]. Organ failure was defined as a SOFA score >2 for any of the six organs/systems evaluated, and MOF, as more than one failing organ [<xref ref-type="bibr" rid="B7">7</xref>]. An increase in the SOFA score of at least 1 point was considered as deterioration in organ function. SOFAmax was defined as the maximum SOFA score recorded during the ICU stay, and SOFAmean, as the mean value during the ICU stay. Individual organ failures during the ICU stay were defined according to the SOFAmax for the corresponding organ. Combinations of organ failures were considered independent of the time of onset of each organ failure. The delta SOFA (ΔSOFA) was calculated as the difference between the SOFA score on a specific day and the score on the day of admission to the ICU [<xref ref-type="bibr" rid="B8">8</xref>].</p></sec><sec><title>Statistical analysis</title><p>For the purposes of this analysis, we excluded all patients who spent less than 48 hours in the ICU. To investigate the impact of sepsis on organ failure, patients were divided into three groups; Patients without sepsis, those in whom sepsis developed within 48 hours after ICU admission, and those in whom sepsis developed more than 48 hours after admission to the ICU.</p><p>Data were analyzed by using SPSS 13.0 for Windows (SPSS Inc., Chicago, IL, USA). Descriptive statistics were computed for all study variables. The Kolmogorov-Smirnov test was used to verify the normality of distribution of continuous variables. Nonparametric tests of comparison were used for variables evaluated as not normally distributed. Difference testing between groups was performed by using the two-tailed <italic>t </italic>test, Mann-Whitney <italic>U </italic>test, χ<sup>2 </sup>test, and Fisher Exact test, as appropriate, with a Bonferroni correction for multiple comparisons. Differences in SOFA scores between groups over time were assessed by using multifactorial analysis of variance (ANOVA).</p><p>Continuous data are presented as mean ± SD, and categoric data, as number (%), unless otherwise indicated. All statistics were two-tailed, and a <italic>P </italic>< 0.05 was considered to be statistically significant.</p></sec></sec><sec sec-type="results"><title>Results</title></sec><sec><title>Characteristics of the study group</title><p>Of the 3,147 patients included in the SOAP database, 2,933 patients stayed in the ICU for more than 48 hours (Table <xref ref-type="table" rid="T1">1</xref>). The admission SOFA score for these patients was 5.0 ± 3.7; the maximum SOFA, 6.6 ± 4.4; and the mean SOFA, 5.0 ± 3.7. The median ICU length of stay was 3.4 (IQ, 2.0 to 7.6) days, and the median length of hospital stay, 16 (8 to 33) days. The overall ICU and hospital mortality rates were 16.6% and 21.9%, respectively.</p><table-wrap id="T1" position="float"><label>Table 1</label><caption><p>Characteristics of the patients on ICU admission, lengths of ICU and hospital stays, and outcomes</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left">Number of patients</th><th align="left">2,933</th></tr></thead><tbody><tr><td align="left">Age, years, median (IQ)<sup>a</sup></td><td align="left">64 (50-74)</td></tr><tr><td colspan="2"><hr></hr></td></tr><tr><td align="left">Sex, male/female, %</td><td align="left">61.5/38.5</td></tr><tr><td colspan="2"><hr></hr></td></tr><tr><td align="left">Type of admission, n (%)</td><td></td></tr><tr><td align="left"> Medical</td><td align="left">1,584 (54.0)</td></tr><tr><td align="left"> Surgical</td><td align="left">1,349 (46.0)</td></tr><tr><td align="left"> Elective</td><td align="left">766 (26.1)</td></tr><tr><td align="left"> Emergency</td><td align="left">583 (19.9)</td></tr><tr><td colspan="2"><hr></hr></td></tr><tr><td align="left">ICU admission source, n (%)<sup>b</sup></td><td></td></tr><tr><td align="left"> ER/ambulance</td><td align="left">818 (27.9)</td></tr><tr><td align="left"> Hospital floor</td><td align="left">726 (24.8)</td></tr><tr><td align="left"> OR/recovery room</td><td align="left">765 (26.1)</td></tr><tr><td align="left"> Other hospital</td><td align="left">332 (11.3)</td></tr><tr><td colspan="2"><hr></hr></td></tr><tr><td align="left">Comorbidities, n (%)</td><td></td></tr><tr><td align="left"> COPD</td><td align="left">322 (11.0)</td></tr><tr><td align="left"> Cancer</td><td align="left">299 (10.2)</td></tr><tr><td align="left"> Heart failure</td><td align="left">287 (9.8)</td></tr><tr><td align="left"> Diabetes</td><td align="left">208 (7.1)</td></tr><tr><td align="left"> Cirrhosis</td><td align="left">115 (3.9)</td></tr><tr><td align="left"> Hematologic cancer</td><td align="left">63 (2.1)</td></tr><tr><td align="left"> HIV/AIDS</td><td align="left">8 (0.3)</td></tr><tr><td colspan="2"><hr></hr></td></tr><tr><td align="left">SAPS II score, mean ± SD</td><td align="left">35.9 ± 16.4</td></tr><tr><td colspan="2"><hr></hr></td></tr><tr><td align="left">SOFA score, mean ± SD</td><td align="left">5.0 ± 3.7</td></tr><tr><td colspan="2"><hr></hr></td></tr><tr><td align="left">Duration of ICU stay, days, median (IQ)</td><td align="left">3.4 (2.0-7.6)</td></tr><tr><td colspan="2"><hr></hr></td></tr><tr><td align="left">Duration of hospital stay, days, median (IQ)</td><td align="left">16.0 (8.0-33.0)</td></tr><tr><td colspan="2"><hr></hr></td></tr><tr><td align="left">ICU mortality, n (%)<sup>c</sup></td><td align="left">486 (16.6)</td></tr><tr><td colspan="2"><hr></hr></td></tr><tr><td align="left">Hospital mortality, n (%)<sup>d</sup></td><td align="left">642 (21.9)</td></tr></tbody></table><table-wrap-foot><p><sup>a</sup>Seven missing values; <sup>b</sup>292 missing values; <sup>c</sup>one missing value; <sup>d</sup>44 missing values.</p></table-wrap-foot></table-wrap><sec><title>Patterns of organ failure and their relation to outcome</title><p>On admission to the ICU, 1,675 (57.1%) patients had at least one organ failure; these patients had ICU and hospital mortality rates of 27.6% and 34.2%, respectively. In total, 435 (15%) patients developed organ failure in the ICU. The organ failures most commonly present on the day of admission to the ICU were of the cardiovascular (24%) and respiratory (22%) systems, whereas respiratory (43%) and renal (36%) organ failures were the most prevalent during the ICU stay (Table <xref ref-type="table" rid="T2">2</xref>). The combination of respiratory and cardiovascular organ failures was the most common on admission (9%) and during the ICU stay (25%).</p><table-wrap id="T2" position="float"><label>Table 2</label><caption><p>ICU and hospital mortality rates according to the number, type, and combinations of failed organs</p></caption><table frame="hsides" rules="groups"><thead><tr><th></th><th align="left" colspan="3">On admission to the ICU</th><th align="left" colspan="3">At any time during ICU stay</th></tr><tr><th></th><th colspan="6"><hr></hr></th></tr><tr><th></th><th align="left">Incidence (%)</th><th align="left" colspan="2">Mortality (%)</th><th align="left">Incidence (%)</th><th align="left" colspan="2">Mortality (%)</th></tr><tr><th></th><th></th><th colspan="2"><hr></hr></th><th></th><th colspan="2"><hr></hr></th></tr><tr><th></th><th></th><th align="left">ICU</th><th align="left">Hospital</th><th></th><th align="left">ICU</th><th align="left">Hospital</th></tr></thead><tbody><tr><td align="left" colspan="7">Number of failed organs</td></tr><tr><td colspan="7"><hr></hr></td></tr><tr><td align="left"> 1</td><td align="left">927 (32)</td><td align="left">17</td><td align="left">23</td><td align="left">942 (32)</td><td align="left">5</td><td align="left">11</td></tr><tr><td align="left"> 2</td><td align="left">524 (18)</td><td align="left">28</td><td align="left">37</td><td align="left">677 (23)</td><td align="left">24</td><td align="left">33</td></tr><tr><td align="left"> 3</td><td align="left">181 (6)</td><td align="left">45</td><td align="left">50</td><td align="left">334 (11)</td><td align="left">44</td><td align="left">51</td></tr><tr><td align="left"> >3</td><td align="left">43 (1)</td><td align="left">58</td><td align="left">70</td><td align="left">157 (5)</td><td align="left">73</td><td align="left">79</td></tr><tr><td colspan="7"><hr></hr></td></tr><tr><td align="left" colspan="7">Type of organ failure<sup>a</sup></td></tr><tr><td colspan="7"><hr></hr></td></tr><tr><td align="left"> Cardiovascular</td><td align="left">717 (24)</td><td align="left">31</td><td align="left">39</td><td align="left">993 (34)</td><td align="left">35</td><td align="left">41</td></tr><tr><td align="left"> Respiratory</td><td align="left">653 (22)</td><td align="left">27</td><td align="left">33</td><td align="left">1,258 (43)</td><td align="left">29</td><td align="left">36</td></tr><tr><td align="left"> CNS</td><td align="left">601 (21)</td><td align="left">32</td><td align="left">39</td><td align="left">757 (26)</td><td align="left">38</td><td align="left">45</td></tr><tr><td align="left"> Renal</td><td align="left">513 (18)</td><td align="left">26</td><td align="left">35</td><td align="left">1,058 (36)</td><td align="left">28</td><td align="left">36</td></tr><tr><td align="left"> Coagulation</td><td align="left">130 (18)</td><td align="left">36</td><td align="left">45</td><td align="left">290 (10)</td><td align="left">44</td><td align="left">54</td></tr><tr><td align="left"> Hepatic</td><td align="left">82 (3)</td><td align="left">33</td><td align="left">40</td><td align="left">165 (6)</td><td align="left">38</td><td align="left">45</td></tr><tr><td colspan="7"><hr></hr></td></tr><tr><td align="left" colspan="7">Combinations of two organ failures</td></tr><tr><td colspan="7"><hr></hr></td></tr><tr><td align="left"> Respiratory + cardiovascular</td><td align="left">274 (9)</td><td align="left">39</td><td align="left">46</td><td align="left">726 (25)</td><td align="left">39</td><td align="left">46</td></tr><tr><td align="left"> Respiratory + renal</td><td align="left">120 (4)</td><td align="left">42</td><td align="left">49</td><td align="left">543 (19)</td><td align="left">41</td><td align="left">48</td></tr><tr><td align="left"> Respiratory + CNS</td><td align="left">197 (7)</td><td align="left">38</td><td align="left">47</td><td align="left">488 (17)</td><td align="left">43</td><td align="left">50</td></tr><tr><td align="left"> Hepatic + renal</td><td align="left">24 (1)</td><td align="left">38</td><td align="left">46</td><td align="left">98 (3)</td><td align="left">47</td><td align="left">51</td></tr><tr><td align="left"> Respiratory + hepatic</td><td align="left">22 (1)</td><td align="left">50</td><td align="left">50</td><td align="left">109 (4)</td><td align="left">47</td><td align="left">53</td></tr><tr><td align="left"> Renal + cardiovascular</td><td align="left">24 (1)</td><td align="left">38</td><td align="left">46</td><td align="left">481 (16)</td><td align="left">47</td><td align="left">55</td></tr><tr><td align="left"> CNS + cardiovascular</td><td align="left">220 (8)</td><td align="left">39</td><td align="left">48</td><td align="left">390 (13)</td><td align="left">50</td><td align="left">55</td></tr><tr><td align="left"> CNS + renal</td><td align="left">109 (4)</td><td align="left">39</td><td align="left">51</td><td align="left">308 (11)</td><td align="left">49</td><td align="left">57</td></tr><tr><td align="left"> Hepatic + cardiovascular</td><td align="left">29 (1)</td><td align="left">48</td><td align="left">52</td><td align="left">97 (3)</td><td align="left">55</td><td align="left">59</td></tr><tr><td align="left"> Respiratory + coagulation</td><td align="left">34 (1)</td><td align="left">47</td><td align="left">53</td><td align="left">203 (7)</td><td align="left">53</td><td align="left">63</td></tr><tr><td align="left"> Coagulation + cardiovascular</td><td align="left">51 (2)</td><td align="left">47</td><td align="left">59</td><td align="left">201 (7)</td><td align="left">56</td><td align="left">65</td></tr><tr><td align="left"> Coagulation + renal</td><td align="left">25 (1)</td><td align="left">52</td><td align="left">68</td><td align="left">159 (5)</td><td align="left">59</td><td align="left">67</td></tr><tr><td align="left"> Coagulation + hepatic</td><td align="left">15 (1)</td><td align="left">67</td><td align="left">80</td><td align="left">64 (2)</td><td align="left">63</td><td align="left">70</td></tr><tr><td align="left"> Hepatic + CNS</td><td align="left">29 (1)</td><td align="left">58</td><td align="left">67</td><td align="left">97 (3)</td><td align="left">66</td><td align="left">71</td></tr><tr><td align="left"> Coagulation + CNS</td><td align="left">23 (1)</td><td align="left">65</td><td align="left">74</td><td align="left">113 (4)</td><td align="left">69</td><td align="left">79</td></tr></tbody></table><table-wrap-foot><p><sup>a</sup>Alone or in combination with other organs.</p></table-wrap-foot></table-wrap><p>Hospital mortality rates increased according to the severity of organ dysfunction/failure as assessed by the SOFA score (Figure <xref ref-type="fig" rid="F1">1</xref>) and according to the number of failing organs (Table <xref ref-type="table" rid="T2">2</xref>). The highest hospital mortality rates were observed in patients with failure of the hepatic or coagulation systems, and in patients with combined coagulation and hepatic or coagulation and central nervous system (CNS) failure, mortality rates reached 70% to 80%.</p><fig id="F1" position="float"><label>Figure 1</label><caption><p><bold>Hospital mortality rates according to SOFA score on admission (gray columns) and the maximum SOFA score (black columns)</bold>.</p></caption><graphic xlink:href="cc11868-1"></graphic></fig></sec><sec><title>Early changes in organ failure and outcome</title><p>The time to achieve SOFAmax was longer in nonsurvivors than in survivors (2 (2 to 3) versus 1 (1 to 2) days; <italic>P </italic>< 0.001). Patients who exhibited an improvement or no change in organ function over the first 24 hours after admission to the ICU had lower ICU and hospital mortality rates compared with those whose scores increased (12.4 and 18.4% versus 19.6 and 24.5%; <italic>P </italic>< 0.05 pairwise). Likewise, patients who exhibited an improvement or no change in organ function over the second day in the ICU had lower ICU and hospital mortality rates compared with those whose scores increased (13.8 and 20.7% versus 18.6 and 24.1%; <italic>P </italic>< 0.05 pairwise). Delta SOFA scores were higher and remained higher in nonsurvivors than in survivors over the first 4 days in the ICU; they decreased significantly over time in survivors (Figure <xref ref-type="fig" rid="F2">2</xref>).</p><fig id="F2" position="float"><label>Figure 2</label><caption><p><bold>Error bars representing the delta SOFA scores (mean ± 95% CI) during the first 4 days in the ICU in survivors (solid circles) and nonsurvivors (solid triangles) in the whole cohort (A) (<italic>n </italic>= 2,933) and in patients without (<italic>n </italic>= 1,789) (B), or with sepsis (<italic>n </italic>= 1,144) (C)</bold>. *<italic>P </italic>< 0.05 compared with ΔSOFA 24-0 (ANOVA with Bonferroni correction for multiple comparisons); †multifactorial ANOVA; <italic>P </italic>< 0.05 compared with survivors.</p></caption><graphic xlink:href="cc11868-2"></graphic></fig></sec></sec><sec><title>Impact of sepsis on incidence and outcome from organ failure</title><p>In total, 1,144 (39%) patients had sepsis at some point during the ICU stay, including 865 during the first 48 hours in the ICU and 279 after 48 hours. MOF occurred more frequently in patients with sepsis, irrespective of the time of onset (Table <xref ref-type="table" rid="T3">3</xref>). During the ICU stay, renal failure was the most common organ failure in patients who never had sepsis, and respiratory failure was the most common in patients with sepsis.</p><table-wrap id="T3" position="float"><label>Table 3</label><caption><p>Incidence of organ failure according to the presence of sepsis</p></caption><table frame="hsides" rules="groups"><thead><tr><th></th><th align="left"><bold>No sepsis (</bold><italic>n </italic><bold>= 1,789)</bold></th><th align="left">Sepsis within 48 hours (<italic>n </italic>= 865)</th><th align="left">Sepsis after 48 hours (<italic>n </italic>= 279)</th></tr></thead><tbody><tr><td align="left" colspan="4">Organ failure on admission to the ICU</td></tr><tr><td colspan="4"><hr></hr></td></tr><tr><td align="left">Number of failing organs, median (IQ)</td><td align="left">0 (0-1)</td><td align="left">1 (0-2)<sup>a</sup></td><td align="left">1 (0-2)<sup>a</sup></td></tr><tr><td align="left">Any organ failure, <italic>n </italic>(%)</td><td align="left">874 (49)</td><td align="left">607 (70)<sup>a</sup></td><td align="left">194 (70)<sup>a</sup></td></tr><tr><td align="left"> 1</td><td align="left">563 (32)</td><td align="left">271 (31)</td><td align="left">93 (33)</td></tr><tr><td align="left"> 2</td><td align="left">228 (13)</td><td align="left">219 (25)<sup>a</sup></td><td align="left">77 (28)<sup>a</sup></td></tr><tr><td align="left"> 3</td><td align="left">72 (4)</td><td align="left">87 (10)<sup>a</sup></td><td align="left">22 (8)<sup>a</sup></td></tr><tr><td align="left"> >3</td><td align="left">11 (1)</td><td align="left">30 (3)<sup>b</sup></td><td align="left">2 (1)</td></tr><tr><td align="left" colspan="4">Type of organ failure</td></tr><tr><td align="left"> Respiratory</td><td align="left">320 (18)</td><td align="left">256 (30)<sup>a</sup></td><td align="left">77 (28)<sup>a</sup></td></tr><tr><td align="left"> CNS</td><td align="left">317 (18)</td><td align="left">199 (23)<sup>a</sup></td><td align="left">85 (31)<sup>a</sup></td></tr><tr><td align="left"> Cardiovascular</td><td align="left">306 (17)</td><td align="left">320 (37)<sup>a</sup></td><td align="left">91 (33)<sup>a</sup></td></tr><tr><td align="left"> Renal</td><td align="left">258 (14)</td><td align="left">210 (24)<sup>a</sup></td><td align="left">45 (16)</td></tr><tr><td align="left"> Coagulation</td><td align="left">49 (3)</td><td align="left">69 (8)<sup>a</sup></td><td align="left">12 (4)</td></tr><tr><td align="left"> Hepatic</td><td align="left">30 (2)</td><td align="left">41 (5)<sup>a</sup></td><td align="left">11 (4)<sup>b</sup></td></tr><tr><td colspan="4"><hr></hr></td></tr><tr><td align="left" colspan="4">Organ failure at any time during ICU stay</td></tr><tr><td colspan="4"><hr></hr></td></tr><tr><td align="left">Number of failing organs, median (IQ)</td><td align="left">1 (0-2)</td><td align="left">2 (1-3)</td><td align="left">2 (1-3)</td></tr><tr><td align="left">Any organ failure, <italic>n </italic>(%)</td><td align="left">1,120 (63)</td><td align="left">732 (85)<sup>a</sup></td><td align="left">258 (92)<sup>a</sup></td></tr><tr><td align="left"> 1</td><td align="left">652 (36)</td><td align="left">230 (27)<sup>a</sup></td><td align="left">60 (22)<sup>a</sup></td></tr><tr><td align="left"> 2</td><td align="left">307 (17)</td><td align="left">253 (29)<sup>a</sup></td><td align="left">117 (42)<sup>a</sup></td></tr><tr><td align="left"> 3</td><td align="left">121 (7)</td><td align="left">158 (18)<sup>a</sup></td><td align="left">55 (20)<sup>a</sup></td></tr><tr><td align="left"> >3</td><td align="left">40 (2)</td><td align="left">98 (11)<sup>a</sup></td><td align="left">26 (9)<sup>a</sup></td></tr><tr><td align="left" colspan="4">Type of organ failure</td></tr><tr><td align="left"> Renal</td><td align="left">559 (31)</td><td align="left">386 (45)<sup>a</sup></td><td align="left">113 (41)<sup>a</sup></td></tr><tr><td align="left"> Respiratory</td><td align="left">514 (29)</td><td align="left">528 (61)<sup>a</sup></td><td align="left">216 (77)<sup>a</sup></td></tr><tr><td align="left"> Cardiovascular</td><td align="left">406 (23)</td><td align="left">432 (50)<sup>a</sup></td><td align="left">155 (56)<sup>a</sup></td></tr><tr><td align="left"> CNS</td><td align="left">368 (21)</td><td align="left">270 (31)<sup>a</sup></td><td align="left">119 (43)<sup>a</sup></td></tr><tr><td align="left"> Coagulation</td><td align="left">102 (6)</td><td align="left">143 (17)<sup>a</sup></td><td align="left">45 (16)<sup>a</sup></td></tr><tr><td align="left"> Hepatic</td><td align="left">49 (3)</td><td align="left">84 (10)<sup>a</sup></td><td align="left">32 (12)<sup>a</sup></td></tr></tbody></table><table-wrap-foot><p>CNS, central nervous system; IQ, interquartile range. <sup>b</sup><italic>P </italic>< 0.05; <sup>a</sup><italic>P </italic>< 0.01 compared with patients without sepsis (pairwise comparisons with Bonferroni correction for multiple comparisons).</p></table-wrap-foot></table-wrap><p>ICU (24 and 28 versus 11%; <italic>P </italic>< 0.001 each) and hospital mortality rates (33 and 33 versus 14%; <italic>P </italic>< 0.001 each) were more than double in patients who had sepsis within or after 48 hours than in those who never had sepsis. Mortality from any type of organ failure was higher in patients with sepsis than in those who did not have sepsis, irrespective of the time of onset (Table <xref ref-type="table" rid="T4">4</xref>). Hospital mortality rates in patients with single-organ failure during the ICU stay were higher in patients with sepsis than in those who never had sepsis (sepsis within 48 hours and sepsis after 48 hours versus no sepsis: hospital mortality, 16 and 13 versus 9%, respectively; <italic>P </italic>< 0.01 pairwise). However, patients with MOF had similar mortality rates regardless of whether they had sepsis (ICU mortality ranging from 23% to 76%, and hospital mortality ranging from 32% to 89%).</p><table-wrap id="T4" position="float"><label>Table 4</label><caption><p>ICU and hospital mortality rates according to the number and type of failed organs and the presence of sepsis</p></caption><table frame="hsides" rules="groups"><thead><tr><th></th><th align="left" colspan="3">ICU mortality (%)</th><th align="left" colspan="3">Hospital mortality</th></tr><tr><th></th><th colspan="6"><hr></hr></th></tr><tr><th></th><th align="left">No sepsis <italic>n </italic>= 1,789</th><th align="left">Sepsis within 48 hours <italic>n </italic>= 865</th><th align="left">Sepsis after 48 hours <italic>n </italic>= 279</th><th align="left">No sepsis <italic>n </italic>= 1,789</th><th align="left">Sepsis within 48 hours <italic>n </italic>= 865</th><th align="left">Sepsis after 48 hours <italic>n </italic>= 279</th></tr></thead><tbody><tr><td align="left" colspan="7">On admission to the ICU</td></tr><tr><td align="left">Any organ failure</td><td align="left">20</td><td align="left">30<sup>a</sup></td><td align="left">30<sup>a</sup></td><td align="left">25</td><td align="left">40<sup>a</sup></td><td align="left">37<sup>a</sup></td></tr><tr><td align="left"> 1</td><td align="left">13</td><td align="left">20<sup>a</sup></td><td align="left">30<sup>a</sup></td><td align="left">18</td><td align="left">30<sup>a</sup></td><td align="left">36<sup>a</sup></td></tr><tr><td align="left"> 2</td><td align="left">25</td><td align="left">30</td><td align="left">29</td><td align="left">33</td><td align="left">41<sup>a</sup></td><td align="left">38<sup>a</sup></td></tr><tr><td align="left"> 3</td><td align="left">44</td><td align="left">48</td><td align="left">32</td><td align="left">47</td><td align="left">56</td><td align="left">36</td></tr><tr><td align="left"> > 3</td><td align="left">55</td><td align="left">60</td><td align="left">50</td><td align="left">64</td><td align="left">73</td><td align="left">50</td></tr><tr><td align="left">Type of organ failure</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td align="left"> Respiratory</td><td align="left">10</td><td align="left">34<sup>a</sup></td><td align="left">31<sup>a</sup></td><td align="left">25</td><td align="left">44<sup>a</sup></td><td align="left">36<sup>a</sup></td></tr><tr><td align="left"> CNS</td><td align="left">34</td><td align="left">32</td><td align="left">27<sup>a</sup></td><td align="left">38</td><td align="left">42<sup>b</sup></td><td align="left">36<sup>a</sup></td></tr><tr><td align="left"> Cardiovascular</td><td align="left">25</td><td align="left">38<sup>a</sup></td><td align="left">28<sup>b</sup></td><td align="left">31</td><td align="left">48<sup>a</sup></td><td align="left">33<sup>a</sup></td></tr><tr><td align="left"> Renal</td><td align="left">20</td><td align="left">32<sup>a</sup></td><td align="left">31<sup>a</sup></td><td align="left">26</td><td align="left">44<sup>a</sup></td><td align="left">42<sup>a</sup></td></tr><tr><td align="left"> Coagulation</td><td align="left">22</td><td align="left">46<sup>a</sup></td><td align="left">33<sup>b</sup></td><td align="left">27</td><td align="left">58<sup>a</sup></td><td align="left">50<sup>b</sup></td></tr><tr><td align="left"> Hepatic</td><td align="left">20</td><td align="left">34<sup>a</sup></td><td align="left">64<sup>a</sup></td><td align="left">28</td><td align="left">42<sup>a</sup></td><td align="left">64<sup>a</sup></td></tr><tr><td colspan="7"><hr></hr></td></tr><tr><td align="left" colspan="7">At any time during the ICU stay</td></tr><tr><td colspan="7"><hr></hr></td></tr><tr><td align="left">Any organ failure</td><td align="left">17</td><td align="left">28<sup>a</sup></td><td align="left">30<sup>a</sup></td><td align="left">22</td><td align="left">38<sup>a</sup></td><td align="left">37<sup>a</sup></td></tr><tr><td align="left"> 1</td><td align="left">5</td><td align="left">6</td><td align="left">7</td><td align="left">9</td><td align="left">16<sup>a</sup></td><td align="left">13<sup>a</sup></td></tr><tr><td align="left"> 2</td><td align="left">24</td><td align="left">23</td><td align="left">27</td><td align="left">32</td><td align="left">34</td><td align="left">34</td></tr><tr><td align="left"> 3</td><td align="left">47</td><td align="left">43</td><td align="left">42</td><td align="left">50</td><td align="left">52</td><td align="left">51</td></tr><tr><td align="left"> >3</td><td align="left">76</td><td align="left">71</td><td align="left">69</td><td align="left">76</td><td align="left">89</td><td align="left">77</td></tr><tr><td align="left">Type of organ failure</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td align="left"> Renal</td><td align="left">20</td><td align="left">38<sup>a</sup></td><td align="left">41<sup>a</sup></td><td align="left">26</td><td align="left">50<sup>a</sup></td><td align="left">50<sup>a</sup></td></tr><tr><td align="left"> Respiratory</td><td align="left">24</td><td align="left">32<sup>a</sup></td><td align="left">32<sup>a</sup></td><td align="left">28</td><td align="left">41<sup>a</sup></td><td align="left">40<sup>a</sup></td></tr><tr><td align="left"> Cardiovascular</td><td align="left">29</td><td align="left">40<sup>a</sup></td><td align="left">37<sup>a</sup></td><td align="left">33</td><td align="left">49<sup>a</sup></td><td align="left">42<sup>a</sup></td></tr><tr><td align="left"> CNS</td><td align="left">36</td><td align="left">40<sup>a</sup></td><td align="left">39<sup>a</sup></td><td align="left">40</td><td align="left">50<sup>a</sup></td><td align="left">46<sup>a</sup></td></tr><tr><td align="left"> Coagulation</td><td align="left">33</td><td align="left">49<sup>a</sup></td><td align="left">53<sup>a</sup></td><td align="left">41</td><td align="left">60<sup>a</sup></td><td align="left">64<sup>a</sup></td></tr><tr><td align="left"> Hepatic</td><td align="left">27</td><td align="left">42<sup>a</sup></td><td align="left">47<sup>a</sup></td><td align="left">33</td><td align="left">49<sup>a</sup></td><td align="left">50<sup>a</sup></td></tr></tbody></table><table-wrap-foot><p>CNS, central nervous system; IQ, interquartile range. <sup>b</sup><italic>P </italic>< 0.05; <sup>a</sup><italic>P </italic>< 0.01 compared with patients without sepsis (pairwise comparisons with Bonferroni correction for multiple comparisons).</p></table-wrap-foot></table-wrap><p>Delta SOFA scores over the first 4 days in the ICU were higher in nonsurvivors than in survivors, regardless of the presence of sepsis (Figure <xref ref-type="fig" rid="F2">2</xref>). SOFA scores remained elevated in survivors but decreased over time in survivors, irrespective of the presence of sepsis.</p></sec><sec sec-type="discussion"><title>Discussion</title><p>The main findings of our study were that (a) whatever the degree of organ failure at ICU admission, patients who exhibited an improvement or no change in organ function during the first 24 to 48 hours in the ICU had lower mortality rates than did those in whom organ function worsened; (b) in patients with single-organ failure during the ICU stay, hospital mortality was significantly greater in patients with sepsis than in those without; (c) patients with MOF had similar mortality rates, regardless of the presence of sepsis.</p><p>The association between early improvement in organ function and favorable prognosis has been reported in several other studies [<xref ref-type="bibr" rid="B8">8</xref>,<xref ref-type="bibr" rid="B15">15</xref>,<xref ref-type="bibr" rid="B16">16</xref>]. In 287 patients with severe sepsis, Russell <italic>et al. </italic>[<xref ref-type="bibr" rid="B15">15</xref>] reported that worsening of organ function over the first 3 days after the onset of sepsis syndrome was associated with higher 30-day mortality rates than was improvement or no change in organ function. In a study of 1,036 patients with severe sepsis, Levy <italic>et al. </italic>[<xref ref-type="bibr" rid="B16">16</xref>] also reported that early changes (baseline to day 1) in organ function were closely related to outcome. Interestingly, we found that the evolution of organ function on the second day in the ICU was associated with outcome, irrespective of the degree of organ function on admission to the ICU. These observations may help to identify patients in whom continuing therapy is likely to be futile [<xref ref-type="bibr" rid="B17">17</xref>], or to define patients who may benefit from a change in therapeutic strategy (for example, another surgical intervention, a change in antibiotic therapy, or more-intensive vasoactive support).</p><p>We found that the time required to achieve the highest degree of organ dysfunction/failure was shorter in survivors than in non-survivors. However, no specific pattern of organ failure was related to the presence of sepsis in our patients. Dulhunty <italic>et al. </italic>[<xref ref-type="bibr" rid="B18">18</xref>] reported that CNS dysfunction was more commonly present in patients with systemic inflammatory response syndrome (SIRS) but no infection and was associated more commonly with death in these patients than in those with sepsis. However, the assessment of neurologic failure using the GCS may be confounded by the frequent use of sedative agents in critically ill patients.</p><p>Several studies [<xref ref-type="bibr" rid="B3">3</xref>,<xref ref-type="bibr" rid="B6">6</xref>,<xref ref-type="bibr" rid="B16">16</xref>,<xref ref-type="bibr" rid="B19">19</xref>] have investigated the epidemiology and outcome of sepsis-associated organ dysfunction/failure; however, studies in the nonsepsis population are scarce [<xref ref-type="bibr" rid="B4">4</xref>,<xref ref-type="bibr" rid="B18">18</xref>]. Dulhunty <italic>et al. </italic>[<xref ref-type="bibr" rid="B18">18</xref>] investigated the time course of organ dysfunction and outcome in patients with severe sepsis and patients with severe noninfectious SIRS, but excluded all other patients, which may explain the higher ICU mortality rate of 25% in their noninfected population, compared with the 20% in our study. In our study, hospital mortality from single-organ failure during the ICU stay was greater in patients with sepsis than in those who never had sepsis; interestingly, mortality rates from MOF were similar, regardless of the presence of sepsis. In their large cohort of ICU patients in Australasia, Dulhunty <italic>et al. </italic>[<xref ref-type="bibr" rid="B18">18</xref>] reported similar findings.</p><p>Interestingly, the highest hospital mortality rates were observed in patients with failure of the hepatic or coagulation systems. Because disturbances of coagulation parameters are closely related with liver failure, this study highlights the enormous importance of liver function on the outcome of ICU patients. Umegaki <italic>et al. </italic>[<xref ref-type="bibr" rid="B20">20</xref>] also recently reported that hepatic dysfunction compared with other organ dysfunction was associated with the highest mortality rates in a study including 4,196 patients with severe sepsis.</p><p>A key strength of our study is the large database of patients and its multicenter, pan-European nature. The SOAP study was performed several years ago, but organ-dysfunction patterns are likely to change slowly over time, so these data are still relevant. Nevertheless, our study has some limitations. First, participation was on a voluntary basis. Second, our results can be extrapolated only to ICUs with a similar case-mix. Third, other factors, which were not considered in our report, may influence the outcome of MOF, including comorbidities, severity of illness, and local practice. We also did not discriminate between acute and chronic organ failure in our analysis.</p></sec><sec sec-type="conclusions"><title>Conclusions</title><p>Although sepsis patients have worse outcomes than do nonsepsis patients, the differences are primarily in patients with only one organ failure, as the mortality in MOF is very high, regardless of the presence of sepsis. In all patients (with or without sepsis), changes in organ function during the first 24 to 48 hours after ICU admission can determine outcome, irrespective of the baseline degree of organ dysfunction. These patterns of organ failure and their relation to outcome may be useful in prognostication and, hence, in risk stratification of critically ill patients, including in the setting of clinical trials.</p></sec><sec><title>Key messages</title><p>• Whatever the degree of organ failure on admission to the ICU, patients who exhibited an improvement in organ function during the first 24 to 48 hours in the ICU had lower mortality rates than did the other patients.</p><p>• Higher mortality rates in sepsis compared with nonsepsis patients are primarily the result of higher mortality associated with single rather than multiorgan failure.</p><p>• Mortality rates in patients with multiorgan failure are high, irrespective of the presence of sepsis.</p><p>• Improved knowledge of patterns of organ failure and their relation to outcome may be useful in prognostication and, hence, in risk stratification of critically ill patients.</p></sec><sec><title>Abbreviations</title><p>CNS: central nervous system; GCS: Glasgow Coma Scale; ICU: intensive care unit; MOF: multiple organ failure; SAPS: simplified acute physiology score; SIRS: systemic inflammatory response syndrome; SOFA: sequential organ failure assessment.</p></sec><sec><title>Competing interests</title><p>The authors declare that they have no competing interests.</p></sec><sec><title>Authors' contributions</title><p>JLV conceived the initial SOAP study. RM, HG, VMR, YS, and JLV participated in the design and coordination of the SOAP study. YS performed the statistical analyses. SL, YS, and JLV drafted the present manuscript. RM, VMR, AG, YS revised the draft. All authors read and approved the final manuscript.</p></sec></body><back><sec><title>Acknowledgements</title><p>The SOAP study was supported by an unlimited grant from Abbott, Baxter, Eli Lilly, GlaxoSmithKline, and NovoNordisk. These companies had no involvement at any stage of the study design, in the collection and analysis of data, in writing the manuscript, or in the decision to submit for publication. We also acknowledge the important role of all the participating centers (listed by country alphabetically): <italic>Austria: </italic>University Hospital of Vienna (G. Delle Karth); LKH Steyr (V. Draxler); LKH-Deutschlandsberg (G. Filzwieser); Otto Wagner Spital of Vienna (W. Heindl); Krems of Donau (G. Kellner, T. Bauer); Barmherzige Bruede of Linz (K. Lenz); KH Floridsdorf of Vienna (E. Rossmann); University Hospital of Innsbruck (C. Wiedermann); <italic>Belgium: </italic>CHU of Charleroi (P. Biston); Hôpitaux Iris Sud of Brussels (D. Chochrad); Clinique Europe Site St Michel of Brussels (V. Collin); C.H.U. of Liège (P. Damas); University Hospital Ghent (J. Decruyenaere, E. Hoste); CHU Brugmann of Brussels (J. Devriendt); Centre Hospitalier Jolimont-Lobbes of Haine St Paul (B. Espeel); CHR Citadelle of Liege (V. Fraipont); UCL Mont-Godinne of Yvoir (E. Installe); ACZA Campus Stuivenberg (M. Malbrain); OLV Ziekenhuis Aalst (G. Nollet); RHMS Ath-Baudour-Tournai (J.C. Preiser); AZ St Augustinus of Wilrijk (J. Raemaekers); CHU Saint-Pierre of Brussels (A. Roman); Cliniques du Sud-Luxembourg of Arlon (M. Simon); Academic Hospital Vrije Universiteit Brussels (H. Spapen); AZ Sint-Blasius of Dendermonde (W. Swinnen); Clinique Notre-Dame of Tournai (F. Vallot); Erasme University Hospital of Brussels (J.L. Vincent); <italic>Czech Republic: </italic>University Hospital of Plzen (I. Chytra); U SV.Anny of Brno (L. Dadak); Klaudians of Mlada Boleslav (I. Herold); General Faculty Hospital of Prague (F. Polak); City Hospital of Ostrava (M. Sterba); <italic>Denmark: </italic>Gentofte Hospital, University of Copenhagen (M. Bestle); Rigshospitalet of Copenhagen (K. Espersen); Amager Hospital of Copenhagen (H. Guldager); Rigshospitalet, University of Copenhagen (K-L. Welling); <italic>Finland: </italic>Aland Central Hospital of Mariehamn (D. Nyman); Kuopio University Hospital (E. Ruokonen); Seinajoki Central Hospital (K. Saarinen); <italic>France: </italic>Raymond Poincare of Garches (D. Annane); Institut Gustave Roussy of Villejuif (P. Catogni); Jacques Monod of Le Havre (G. Colas); CH Victor Jousselin of Dreux (F. Coulomb); Hôpital St Joseph & St Luc of Lyon (R. Dorne); Saint Joseph of Paris (M. Garrouste); Hôpital Pasteur of Nice (C. Isetta); CHU Brabois of Vandoeuvre Les Nancy (J. Larché); Saint Louis of Paris (J-R. LeGall); CHU de Grenoble (H. Lessire); CHU Pontchaillou of Rennes (Y. Malledant); Hôpital des Hauts Clos of Troyes (P. Mateu); CHU of Amiens (M. Ossart); Hôpital Lariboisière of Paris (D. Payen); CHD Félix Gyuon of Saint Denis La Reunion (P. Schlossmacher); Hôpital Bichat of Paris (J-F. Timsit); Hôpital Saint Andre of Bordeaux (S. Winnock); Hôpital Victor Dupouy of Argentueil (J-P. Sollet); CH Auch (L. Mallet); CHU Nancy-Brabois of Vandoeuvre (P. Maurer); CH William Morey of Chalon (J-M. Sab); Victor Dupouy of Argenteuil (J-P. Sollet); <italic>Germany: </italic>University Hospital Heidelberg (G. Aykut); Friedrich Schiller University Jena (F. Brunkhorst); University Clinic Hamburg-Eppendorf (A. Nierhaus); University Hospital Mainz (M. Lauterbach); University Hospital Carl Gustav Carus of Dresden (M. Ragaller); Hans Sushemihl Krankenhaus of Emden (R. Gatz); Vivantes-Klinikum Neukoelln of Berlin (H. Gerlach); University Hospital RWTH Aachen (D. Henzler); Kreisklinik Langen-Seligenstadt (H-B Hopf); GKH Bonn (H. Hueneburg); Zentralklinik Bad Berka (W. Karzai); Neuwerk of Moenchengladbach (A. Keller); Philipps University of Marburg (U. Kuhlmann); University Hospital Regensburg (J. Langgartner); ZKH Links der Weser of Bremen (C. Manhold); University Hospital of Dresden (M. Ragaller); Universtiy of Wuerzburg (B. Reith); Hannover Medical School (T. Schuerholz); Universitätsklinikum Charité Campus Mitte of Berlin (C. Spies); Bethanien Hospital of Moers (R. Stögbauer); KhgmbH Schongau (J. Unterburger); <italic>Greece: </italic>Thriassio Hospital of Athens (P-M. Clouva-Molyvdas); Sismanoglion General Hospital of Athens (G. Giokas); KAT General Hospital of Athens (E. Ioannidou); G. Papanikolaou General Hospital of Thessaloniki (A. Lahana); Agios Demetrios of Thessaloniki (A. Liolios); Onassis Cardiac Surgery Center of Athens (K. Marathias); University Hospital of Ioannina (G. Nakos); Tzanio Hospital of Athens (A. Tasiou); Athens General Hospital Gennimatas (H. Tsangaris); <italic>Hungary: </italic>Peterfy Hospital of Budapest (P. Tamasi); <italic>Ireland: </italic>Mater Hospital of Dublin (B. Marsh); Beaumont Hospital of Dublin (M. Power); <italic>Israel: </italic>Hadassah Hebrew University Medical Center (C. Sprung); <italic>Italy: </italic>Azienda Ospedaliera Senese o Siena (B. Biagioli); S. Martino of Genova (F. Bobbio Pallavicini); Azienda Ospedaliera S. Gerardo dei Tintori of Monza (A. Pesenti); Osp Regionale of Saronno (C. Capra); Ospedale Maggiore - University A. Avogadro of Novara (F. Della Corte); Osp. Molinette of Torino (P. P. Donadio); A.O. Umberto I Ancona, Rianimazione Clinica (A. Donati); Azienda Ospedaliera Universitaria Policlinico of Palermo (A. Giarratano); San Giovanni Di Dio of Florence (T. Giorgio); H San Raffaele IRCCS of Milano (D. Giudici); Ospedale Di Busto Arsizio (S. Greco); Civile Di Massa (A. Guadagnucci); San Paolo of Milano (G. Lapichino); S.Giovanni Bosco Torino (S. Livigni); Osp. San Giovanni of Sesto (G. Moise); S Camillo of Roma (G. Nardi); Vittorio Emanuele of Catania (E. Panascia); Hospital of Piacenza (M. Pizzamiglio); Universita di Torino-Ospedale S. Giovanni Battista (V. M. Ranieri); Policlinico Le Scotte of Siena (R. Rosi); Ospedale Maggiore Policlinico IRCCS of Milano (A. Sicignano); A. Uboldo of Cernusco Sul Naviglio (M. Solca); P.O. Civile Carrara of Massa (G. Vignali); San Giovanni of Roma (I. Volpe Rinonapoli); <italic>Netherlands: </italic>Boven IJ Ziekenhuis of Amsterdam (M. Barnas); UMC St Radboud of Nijmegen (E.E. De Bel); Academic Medical Center of Amsterdam (A-C. De Pont); VUMC of Amsterdam (J. Groeneveld); Groningen University Hospital (M Nijsten); Waterlandziekenhuis of Purmerend (L Sie); OLVG of Amsterdam (D. F. Zandstra); <italic>Norway: </italic>Sentralsjukehuset i Rogaland of Stavanger (S. Harboe); Sykehuset Østfold of Fredrikstad (S. Lindén); Aker University Hospital of Oslo (R. 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