MAJOR ARTICLE Severe Hypothermia Increases the Risk for Intensive Care Unit–Acquired Infection Kevin B. Laupland,1,2 Jean-Ralph Zahar,1,3 Christophe Adrie,4 Clémence Minet,5 Aurélien Vésin,1 Dany Goldgran-Toledano,6 Elie Azoulay,7 Maité Garrouste-Orgeas,1,8 Yves Cohen,9 Carole Schwebel,5 Samir Jamali,10 Michael Darmon,11 Anne-Sylvie Dumenil,12 Hatem Kallel,13 Bertrand Souweine,14 and Jean-Franc xois Timsit1,5 1Team 11: Outcome of Respiratory Cancers and Mechanically Ventilated Patients, Integrated Research Center U823–Albert Bonniot Institute, Rond Point de la Chantourne, La Tronche, France; 2Department of Critical Care Medicine, Peter Lougheed Centre, University of Calgary, Alberta, Canada; 3Infection Control and Microbiology Unit, Necker University Hospital, 4Department of Cardiovascular Physiology, Cochin University Hospital, Paris, 5Medical Polyvalent ICU, Grenoble University Hospital, 6Polyvalent ICU, Gonesse General Hospital, 7Medical ICU, University Hospital St Louis, 8Polyvalent ICU, Groupe Hospitalier St Joseph, Paris, 9Medical-Surgical ICU, Avicenne University Hospital, Bobigny, 10Polyvalent ICU, General Hospital, Dourdan, 11Medical ICU, University Hospital, St Etienne, 12Surgical ICU, University Hospital Antoine Beclere, Clamart, 13Polyvalent ICU, General Hospital, Cayenne, and 14Medical ICU, Gabriel Montpied University Hospital, Clermont Ferrand, France Background. Although hypothermia is widely accepted as a risk factor for subsequent infection in surgical patients, it has not been well defined in medical patients. We sought to assess the risk of acquiring intensive care unit (ICU)–acquired infection after hypothermia among medical ICU patients. Methods. Adults ($18 years) admitted to French ICUs for at least 2 days between April 2000 and November 2010 were included. Surgical patients were excluded. Patient were classified as having had mild hypothermia (35.0°C–35.9°C), moderate hypothermia (32°C–34.9°C), or severe hypothermia (,32°C), and were followed for the development of pneumonia or bloodstream infection until ICU discharge. Results. A total of 6237 patients were included. Within the first day of admission, 648 (10%) patients had mild hypothermia, 288 (5%) patients had moderate hypothermia, and 45 (1%) patients had severe hypothermia. Among the 5256 patients who did not have any hypothermia at day 1, subsequent hypothermia developed in 868 (17%), of which 673 (13%), 176 (3%), and 19 (,1%) patients had lowest temperatures of 35.0°C–35.9°C, 32.0°C–34.9°C, and ,32°C, respectively. During the course of ICU admission, 320 (5%) patients developed ICU-acquired bloodstream infection and 724 (12%) patients developed ICU-acquired pneumonia. After controlling for confounding variables in multivariable analyses, severe hypothermia was found to increase the risk for subsequent ICU-acquired infection, particularly in patients who did not present with severe sepsis or septic shock. Conclusions. The presence of severe hypothermia is a risk factor for development of ICU-acquired infection in medical patients. Hypothermia, commonly defined as a body temperature ,36°C, is common among patients who suffer critical illness and is associated with adverse mortality outcome [1–9]. Whereas the presence of hypothermia may be a marker of severity of illness associated with mortality, Received 28 July 2011; accepted 6 December 2011; electronically published 30 January 2012. The manuscript was written on behalf of the OUTCOMEREA study group (listed in the Appendix). Correspondence: Jean-Francois Timsit, MD, PhD, Medical Polyvalent ICU, University Hospital A Michallon, Grenoble, France 38043 ([email protected]). Clinical Infectious Diseases 2012;54(8):1064–70 Ó The Author 2012. Published by Oxford University Press on behalf of the Infectious Diseases Society of America. All rights reserved. For Permissions, please e-mail: [email protected]. DOI: 10.1093/cid/cir1033 1064 d CID 2012:54 (15 April) d Laupland et al it may also result in complications that increase the risk for subsequent adverse outcome. Infection is a widely recognized complication of hypothermia and likely arises, at least in part, due to decreased humoral and cellular immunity associated with reduced body temperature [10–12]. In surgical patients, it is widely recognized that hypothermia increases the risk for wound infection and that minimization of intraoperative hypothermia and long-term treatment at admission to the intensive care unit (ICU) has been demonstrated to reduce infectious complications and improve overall outcome [13]. The epidemiology, clinical features, and outcomes associated with temperature abnormalities are different among medical and surgical patients admitted to ICUs [14]. Although a number of studies have identified that the presence of hypothermia in patients who have sepsis or infection have worse outcomes [5, 7, 15, 16], it is not clear whether hypothermia increases the risk for subsequent development of nosocomial infection in critically ill medical patients. The objective of this study was to describe the occurrence of hypothermia in adult medical patients admitted to ICU and assess the risk for subsequent development of ICU-acquired pneumonia and bloodstream infection. METHODS This study used an inception cohort design. All data were obtained using the OUTCOMEREA database [17]. First admissions among adults ($18 years) between April 2000 and November 2010 with medical classification based on Simplified Acute Physiology Score (SAPS II) criteria were included. Only patients with ICU length of stay $2 days were included. Patients who were treated with therapeutic hypothermia were excluded. Patients were monitored for the development of hypothermia and infection until ICU discharge. According to French law, this study did not require individual patient consent, because it involved research on a previously developed and approved database. OUTCOMEREA OUTCOMEREA is an ongoing prospective observational collaborative study group that includes detailed clinical and outcome data on patients admitted to participating French ICUs [17]. The lowest temperature is routinely recorded at presentation (the time between admission and 7:00 AM) and then daily thereafter. Data included in the OUTCOMEREA database have been collected by senior physicians or by trained monitors in the participating ICUs. In some cases, participants in the OUTCOMEREA group have enrolled consecutive patients admitted to ICU, and in others sampling has been performed in which all consecutive admissions at a specific time during the year or to certain ICU beds are included. For each patient, the data were entered into an electronic case-report form using VIGIREA and RHEA data-capture software (OUTCOMEREA, Paris, France), and all case-report forms were then entered into the OUTCOMEREA data warehouse. The data-capture software automatically conducts multiple checks for internal consistency of most of the variables upon entry into the database. Queries generated by these checks were resolved with the source ICU before incorporation of the new data into the database. At each participating ICU, data quality was controlled by having a senior physician from another participating ICU check a 2% random sample of the study data. A 1-day coding course is organized annually with the study investigators and contrast research organization monitors. Study Protocol Once all study patients were identified, presentation and daily low temperatures were recorded, and the admission age, gender, and SAPS II and sepsis-related organ failure assessment scores were extracted [18, 19]. Knaus scale definitions were used to record preexisting chronic organ failures including respiratory, cardiac, hepatic, renal, and immune system compromise [20]. The requirement for assisted ventilation, renal replacement therapy, and use of corticosteroids was recorded. The presence of severe sepsis and septic shock was established using standard criteria [21]. Patients were classified according to a priori–defined criteria for the presence of hypothermia as defined as any low temperature measured ,36°C. Once patients fulfilled criteria for hypothermia, they were considered to be at subsequent risk per that group unless criteria for a more severe category were fulfilled. There was no requirement for a particular duration of hypothermia. Mild hypothermia was classified as a body temperature of 35.0°C–35.9°C, and moderate and severe hypothermia were classified as low temperatures of 32.0°C–34.9°C and ,32°C, respectively [4]. Admission temperatures were recorded until the end of day 1 admission to ICU. The presence of infection was documented according to the standard definitions of the Centers for Disease Control and Prevention [22]. Patients were deemed to have ICU-acquired infections (pneumonia or bloodstream infection) if these first occurred 2 or more days after ICU admission. Statistical Analysis All data were analyzed using Stata 11.2 (Statacorp, College Station, TX). Before analysis, the underlying distribution of all continuous variables was assessed using histograms. Means with standard deviations (SDs) were used to describe normally or near normally distributed continuous variables, and skewed variables were reported as medians with interquartile ranges (IQR). Categorical variables were compared using Fisher’s exact test for 2 3 2 tables, and the v2 test was used for multiple categories. Subdistribution proportional hazards [23] models were developed to assess the independent effects of hypothermia that occurred within the first 2 days of admission to ICU on subsequent risk for ICU-acquired infection Discharge from ICU or death were treated as competing events. The initial models included temperature classification, ventilation status, antimicrobial therapy at admission, SAPS II, age, gender, corticosteroid therapy, hemodialysis, sepsis syndromes, and Knaus scale comorbidities. Stepwise variable elimination was performed to develop the final models. The assumption of proportional subhazards was assessed by testing for interactions with time. For all analyses, P , .05 was considered to be statistically significant. Hypothermia and ICU-Acquired Infections d CID 2012:54 (15 April) d 1065 RESULTS A total of 6237 patients were included. The median age was 63 years (IQR, 49–76), 3738 (60%) admissions were males, and the median admission SAPS II score was 42 (IQR, 30–55). There were 66 168 patient days of observation, 65 182 (99%) of which were completed for temperature data. Within the first day of admission, the mean (6SD) low temperature was 36.6 6 1.1°C, and 648 (10%) patients had at mild hypothermia (35.0°C–35.9°C), 288 (5%) patients had moderate hypothermia (32.0°C–34.9°C), and 45 (1%) patients had severe hypothermia (,32°C). Among patients with hypothermia at admission (within day 1), 630 of 648 (97%), 269 of 288 (93%), and 41 of 45 (91%) patients with mild, moderate, and severe hypothermia had resolution to $36°C while alive and admitted to ICU, with the median number of days to resolution of 2 (IQR, 2–3), 2 (IQR, 2–3), and 3 (IQR, 2–4) days, respectively. Among the 5256 patients who did not have any hypothermia at day 1, subsequent hypothermia developed in 868 (17%), of which 673 (13%), 176 (3%), and 19 (,1%) patients had lowest temperatures of 35.0°C–35.9°C, 32.0°C–34.9°C, and ,32°C, respectively. The time to first temperatures ,36°C, ,35°C, and ,32°C in this cohort were 4 (3–8), 5 (3–11), and 6 (3–10) days, respectively. The cumulative incidence of at least 1 documented hypothermia episode ,36°C was 1849/6237 (30%). The cumulative incidence of mild hypothermia was 1242 (20%), moderate hypothermia was 533 (9%), and 74 (1%) for severe hypothermia. Among the total 66 168 ICU admission days, the incidence density for mild, moderate, and severe hypothermia were 4.9, 1.4, and 0.1 per 100 days, respectively. During the course of ICU admission, 320 (5%) patients developed ICU-acquired bloodstream infection and 724 (12%) patients developed ICU-acquired pneumonia. The median time to development of bloodstream infection or pneumonia was 8 (4–14) and 6 (3–12) days, respectively. The cumulative incidence of pneumonia, bloodstream infection, or either was related to the degree of hypothermia at admission as shown in Table 1. Among the first 897 ICU-acquired infections, 683 were pneumonias and 214 were bloodstream infections. No difference in etiology was observed in relation to the presence or degree of hypothermia. Although there was no difference in age (P 5 .684), higher median SAPS II scores were associated with development of an ICU-acquired infection (48; IQR, 36–61 vs 41; IQR, 29–54; P , .0001). A number of categorical factors were assessed for their association with development of an ICU-acquired infection in univariate analyses and are shown in Table 2. The overall median length of ICU stay was 5 (IQR, 3–11) days. The overall ICU and in-hospital case-fatality rates were 1120 of 6237 (18%) and 1434 (23%), respectively. Three multivariable subdistribution proportional hazards models (overall and 1 for patients presenting with severe sepsis/septic shock and the other without) were developed with ICU discharge or death treated as a competing risk to assess the effect of hypothermia occurring within the first 2 days of ICU admission on subsequent risk for acquisition of an ICU-acquired infection (pneumonia and/or bloodstream infection). After controlling for confounding variables, severe hypothermia was associated with a significant increased risk for later development of ICUacquired infection in the overall cohort and among patients who did not present with severe sepsis or septic shock, as shown in Tables 3 and 4, respectively. Hypothermia was not found to be associated with an increased risk for ICU-acquired infection among patients with severe sepsis or septic shock, as shown in Table 5. DISCUSSION In this study, we demonstrate that hypothermia is a common abnormal physical sign observed among critically ill medical patients both at time of admission and subsequently during their stay. We also show that hypothermia, especially when severe, is Table 1. Risk for Development of Intensive Care Unit (ICU)–Acquired Bloodstream Infection and/or Pneumonia According to the Presence of Hypothermia at Admission to ICU No Hypothermia (n 5 5256) Mild (n 5 648) Moderate (n 5 288) Severe (n 5 45) P Value Bloodstream infection 245 (4.7%) 49 (7.6%) 20 (6.9%) 6 (13.3%) ,.001a Pneumonia 615 (11.7%) 71 (11.0%) 27 (9.4%) 11 (24.4%) .030b Either 741 (14.1%) 103 (15.9%) 39 (13.5%) 14 (31.1%) .008c a Rates were not different among mild, moderate, and severe hypothermic patients (P 5 .322), but hypothermic patients were significantly different compared with patients with no hypothermia (P 5 .0002). b Rates were not different among patients with no hypothermia, mild hypothermia, or moderate hypothermia (P 5 .434), but severe hypothermia was significantly different compared with other conditions (P 5 .0157). c Rates were not different among patients with no hypothermia, mild hypothermia, or moderate hypothermia (P 5 .438), but severe hypothermia was significantly different compared other conditions (P 5 .0041). 1066 d CID 2012:54 (15 April) d Laupland et al Table 2. Assessment of Factors Associated With Development of an Intensive Care Unit (ICU)–Acquired Infection (Pneumonia and/or Bloodstream Infection) Among Medical ICU Patients (Univariate Analysis) ICU-Acquired Infection With Factor Factor ICU-Acquired Infection Without Factor Relative Risk (95% Confidence Interval) Hypothermia class P Value ,.001 None 474/4388 (11%) Admission mild 103/648 (16%) Admission moderate 39/288 (14%) Admission severe 14/45 (31%) Male gender Not ventilated 590/3738 (16%) 255/2917 (9%) Noninvasive 307/2499 (12%) 1.28 (1.13–1.46) ,.0001 ,.001 99/780 (13%) Invasive 543/2540 (21%) Day 1 renal replacement 39/321 (12%) 858/5058 (15%) .84 (.62–1.13) .288 Day 1 central vein catheter 434/2239 (19%) 463/3998 (12%) 1.78 (1.59–2.03) ,.0001 Day 1 antimicrobial therapy 561/3692 (15%) 336/2545 (13%) 1.15 (1.02–1.30) .0277 Corticosteroids 185/1055 (18%) 712/5182 (14%) 1.28 (1.10–1.48) .0017 Severe sepsis/shock Diabetes 457/2326 (20%) 143/1003 (14%) 440/3911 (11% 754/5234 (14%) 1.75 (1.55–1.97) .99 (.84–1.17) ,.0001 .922 Hepatic disease Cardiovascular Respiratory Kidney Immune compromise 58/373 (16%) 839/5864 (14%) 1.09 (.85–1.39) .494 118/856 (14%) 779/5381 (14%) .95 (.80–1.14) .637 189/1104 (17%) 708/5133 (14%) 1.24 (1.07–1.44) .0052 326/375 (13%) 848/5862 (14%) .90 (.69–1.18)) .495 147/1059 (14%) 750/5178 (14%) .96 (.81–1.13) .631 Abbreviation: ICU, intensive care unit. associated with the development of ICU-acquired infection. Although there is ongoing debate on whether ICU-acquired pneumonia significantly increases the attributable risk for death among patients admitted to ICU [24, 25], this appears to be the case for ICU-acquired bloodstream infection [26, 27]. Our observation of an increased risk for infection may, at least in part, explain the increased risk for mortality observed among medical patients admitted to ICU with hypothermia. It is biologically plausible that hypothermia increases the risk for development of subsequent infection. Hypothermia Table 3. Multivariable Modeling of Risk for Development of Intensive Care Unit (ICU)–Acquired Infection Associated With Hypothermia Among Patients Admitted to ICU (Overall Cohort) Table 4. Multivariable Modeling of Risk for Development of Intensive Care Unit (ICU)–Acquired Infection Associated With Hypothermia Among Patients Admitted to ICU Without Severe Sepsis or Septic Shock Temperature Classification Temperature Classification No hypothermia SHR [95% CI] 1 Adj SHR [95% CI] Pa ,.0001 1 Pb .004 No hypothermia SHR [95% CI] 1 Adj SHR [95% CI] Pa ,.0001 1 Mild hypothermia 1.28 [1.04–1.58] .95 [.86–1.51] Mild hypothermia 1.05 [.76–1.46] .74 [.56–1.03] Moderate hypothermia 1.13 [.82–1.56] .78 [.56–1.09] Moderate hypothermia 1.02 [.62–1.69] .65 [.39–1.09] Severe hypothermia 3.54 [2.08–6.03] 2.42 [1.41–4.15] Severe hypothermia 4.52 [2.4–8.52] 2.76 [1.44–5.28] Pb .0009 Abbreviations: Adj, adjusted; CI, confidence interval; SHR, subdistribution hazard ratio. Abbreviations: Adj, adjusted; CI, confidence interval; SHR, subdistribution hazard ratio. a a b Subdistribution hazard model. Subdistribution hazard model adjusted for male sex and respiratory chronic disease, at admission variables (symptoms, Simplified Acute Physiology Score II), on 1st day of admission (and sepsis-related organ failure assessment score, mechanical ventilation, central vein catheter, corticosteroids use, antibiotic use), and stratified by center. Subdistribution hazard model. b Subdistribution hazard model adjusted for male sex and respiratory chronic disease, at admission variables (symptoms, Simplified Acute Physiology Score II), on 1st day of admission (sepsis-related organ failure assessment score, mechanical ventilation, central vein catheter, corticosteroids use, antibiotic use), and stratified by center. Hypothermia and ICU-Acquired Infections d CID 2012:54 (15 April) d 1067 Table 5. Multivariable Modeling of Risk for Development of Intensive Care Unit (ICU)–Acquired Infection Associated With Hypothermia Among Patients Admitted to ICU With Severe Sepsis or Septic Shock Temperature Classification SHR [95% CI] Adj SHR [95% CI] Pa No hypothermia 1 Mild hypothermia 1.40 [1.07–1.85] .06 1.14 [.86–1.51] 1 Moderate hypothermia 1.15 [.75–1.77] .90 [.58–1.39] Severe hypothermia 1.90 [.71–5.13] 1.64 [.60–4.45] Pb .5 Abbreviations: Adj, adjusted; CI, confidence interval; SHR, subdistribution hazard ratio. a Subdistribution hazard model. b Subdistribution hazard model adjusted for male sex and respiratory chronic disease, at admission variables (symptoms, Simplified Acute Physiology Score II), on 1st day of admission (sepsis-related organ failure assessment score, mechanical ventilation, central vein catheter, corticosteroids use, antibiotic use), and stratified by center. has been demonstrated to suppress the release of proinflammatory cytokine levels, lower the expression of heat shock protein 60, and reduce leukocyte count such that there is a relative cellular and humoral immune suppression, which in turn may lead to risk of infection [10–12]. Furthermore, hypothermia may also lead to an increased risk of infection related to a number of other mechanisms including, but not limited to, cold-induced vasoconstriction and relative peripheral ischemia, decreases in level of consciousness, changes in gastric motility, metabolic derangement, and increased rates of bacterial colonization [13, 28, 29]. Although the body of literature is small, the results of previous studies have demonstrated an excess risk for development of infection in neurology, trauma, and other surgical patients associated with hypothermia [29, 30]. Perhaps the most compelling evidence is the clinical trial evidence, which demonstrated that active intervention to reduce intraoperative hypothermia reduces infection risk. In this study conducted by Kurz et al [13], 200 patients undergoing colorectal surgery were randomized to routine intraoperative temperature management or to additional warming. The mean (6SD) final intraoperative temperature was 34.7 6 0.6°C in the routine management and 36.6 6 0.5°C in the warming group. The subsequent risk for wound infection was significantly higher in the routine ‘‘hypothermic’’ group compared with the additional warming group (19% vs 6%; P 5 .002). It is notable that the effects of hypothermia and outcome appear to be different in patients with and without severe sepsis/septic shock. One possibility is that because these patients have severe sepsis or septic shock at admission, they may be subsequently treated with antibiotics that reduce the later 1068 d CID 2012:54 (15 April) d Laupland et al risk for development of an ICU-acquired infection. Others have found that the mortality outcome of severe sepsis/septic shock is particularly influenced by the presence of hypothermia [5–7, 15, 16]. It is possible that similar factors (ie, immune suppression) that contribute to adverse mortality outcome in hypothermic acutely septic patients may also increase risk for subsequent infection in these patients. However, this is a speculative hypothesis that requires further investigation. It is also notable that, although not statistically significant, moderate hypothermia was associated with a lower risk for subsequent infection (Tables 3, 4, and 5). We do not know why this may be the case and suggest that additional studies are needed. Whereas this study benefits from a relatively large sample size obtained from a multicenter study, there are some limitations that merit discussion. More importantly, because this was a retrospective database study, we were limited by the existing information available in the study database. We were not able to ascertain the cause of the original hypothermia, and we are not able to report specifically what interventions may or may not have been performed to treat patients with hypothermia. In addition, there are other factors that increase the risk for ICU-acquired infection (such as the use of invasive devices) that we did not incorporate into our analysis. In contrast, there are probably other factors that may decrease the risk for infection such as antimicrobial use and enhanced attention to procedural technique. Finally, it is possible that hypothermia may have been a result of incubating infection. However, we attempted to minimize this discrepancy by excluding patients who were admitted to the ICU for less than 2 days. In addition, in our multivariable models, we only examined the effect of presence of hypothermia during the first 2 days on the development of later infection, which occurred, on average, more than 1 week later. In summary, this study identifies that hypothermia is a common complication of critical illness among medical patients admitted to ICUs, and that severe hypothermia is a significant risk for subsequent ICU-acquired infection. These data support enhanced efforts to reduce the occurrence of hypothermia among critically ill patients. Studies are needed to define the optimal management of patients with temperature dysregulation in the ICU. Notes Financial support. The study was funded by the OUTCOMEREA organization. Potential conflict of interest. All authors: No conflicts. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Conflicts that the editors consider relevant to the content of the manuscript have been disclosed. References 1. den Hartog AW, de Pont AC, Robillard LB, Binnekade JM, Schultz MJ, Horn J. 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Clin Infect Dis 2010; 51(Suppl 1):S120–5. Laupland KB, Lee H, Gregson DB, Manns BJ. Cost of intensive care unit-acquired bloodstream infections. J Hosp Infect 2006; 63:124–32. Garrouste-Orgeas M, Timsit JF, Tafflet M, et al. Excess risk of death from intensive care unit-acquired nosocomial bloodstream infections: a reappraisal. Clin Infect Dis 2006; 42:1118–26. Fries M, Stoppe C, Brucken D, Rossaint R, Kuhlen R. Influence of mild therapeutic hypothermia on the inflammatory response after successful resuscitation from cardiac arrest. J Crit Care 2009; 24:453–7. Polderman KH. Mechanisms of action, physiological effects, and complications of hypothermia. Crit Care Med 2009; 37(7 Suppl):S186–202. Peterson K, Carson S, Carney N. Hypothermia treatment for traumatic brain injury: a systematic review and meta-analysis. J Neurotrauma 2008; 25:62–71. Appendix Members of the OUTCOMEREA Study Group Scientific Committee. Jean-Franc xois Timsit (Hôpital Albert Michallon and INSERM U823, Grenoble, France), Elie Azoulay (Medical ICU, Hôpital Saint Louis, Paris, France), Yves Cohen (ICU, Hôpital Avicenne, Bobigny, France), Maı̈té Garrouste-Orgeas (ICU Hôpital Saint-Joseph, Paris, France), Lilia Soufir (ICU, Hôpital Saint-Joseph, Paris, France), Jean-Ralph Zahar (Microbiology Department, Hôpital Necker, Paris, France), Christophe Adrie (ICU, Hôpital Delafontaine, Saint Denis, France), Michael Darmon (Medical ICU, University Hospital, St Etienne, France), and Christophe Clec’h (ICU, Hôpital Avicenne, Bobigny, and INSERM U823, Grenoble, France). Biostatistical and Informatics Expertise. Jean-Francois Timsit (Hôpital Albert Michallon and Integrated Research Center U823, Grenoble, France), Corinne Alberti (Medical Computer Sciences and Biostatistics Department, Robert Debré, Paris, France), Adrien Franc xais (Integrated Research Center U823, Grenoble, France), Aurélien Vesin (Integrated Research Center U823, Grenoble, France), Stephane Ruckly (INSERM U823, Grenoble, France), Christophe Clec’h (ICU, Hôpital Avicenne, Bobigny, and INSERM U823, Grenoble, France), Frederik Lecorre (Supelec, France), Didier Nakache (Conservatoire National des Arts et Métiers, Paris, France), and Aurélien Vannieuwenhuyze (Tourcoing, France). Investigators of the OUTCOMEREA Database. Christophe Adrie (ICU, Hôpital Delafontaine, Saint Denis, France and Physiology, Hôpital Cochin, Paris, France), Bernard Allaouchiche (ICU, Edouard Herriot Hospital, Lyon, France), Caroline Bornstain (ICU, Hôpital de Montfermeil, France), Hypothermia and ICU-Acquired Infections d CID 2012:54 (15 April) d 1069 Alexandre Boyer (ICU, Hôpital Pellegrin, Bordeaux, France), Christine Cheval (SICU, Hôpital Saint-Joseph, Paris, France), Jean-Pierre Colin (ICU, Hôpital de Dourdan, Dourdan, France), Michael Darmon (ICU, CHU Saint Etienne, France), Anne-Sylvie Dumenil (Hôpital Antoine Béclère, Clamart, France), Adrien Descorps-Declere (Hôpital Antoine Béclère, Clamart, France), Jean-Philippe Fosse (ICU, Hôpital Avicenne, Bobigny, France), Samir Jamali (ICU, Hôpital de Dourdan, Dourdan, France), Hatem Khallel (ICU, Cayenne General Hospital), Christian Laplace (ICU, Hôpital Kremlin-Bicêtre, Bicêtre, France), Alexandre Lauttrette (ICU, CHU G Montpied, Clermont-Ferrand, France), Thierry Lazard (ICU, Hôpital de la Croix Saint-Simon, Paris, France), Eric Le Miere (ICU, Hôpital Louis Mourier, Colombes, France), Laurent Montesino (ICU, Hôpital Bichat, Paris, France), Bruno 1070 d CID 2012:54 (15 April) d Laupland et al Mourvillier (ICU, Hôpital Bichat, France), Benoı̂t Misset (ICU, Hôpital Saint-Joseph, Paris, France), Delphine Moreau (ICU, Hôpital Saint-Louis, Paris, France), Etienne Pigné (ICU, Hôpital Louis Mourier, Colombes, France), Bertrand Souweine (ICU, CHU G Montpied, Clermont-Ferrand, France), Carole Schwebel (CHU A Michallon, Grenoble, France), Gilles Troché (Hôpital Antoine, Béclère, Clamart, France), Marie Thuong (ICU, Hôpital Delafontaine, Saint Denis, France), Guillaume Thierry (ICU, Hôpital Saint-Louis, Paris, France), Dany Toledano (CH Gonnesse, France), and Eric Vantalon (SICU, Hôpital Saint-Joseph, Paris, France). Study monitors. Caroline Tournegros, Loic Ferrand, Nadira Kaddour, Boris Berthe, Samir Bekkhouche, Sylvain Anselme, and Kaouttar Mellouk.
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