Cluster sizes are estimated according to the annual number of emergency department visits for all patients and for patients aged 75 years or older. There was no screening log in the emergency departments. The number of patients screened for inclusion in each hospital was estimated with the annual number of emergency department visits of patients aged 75 years or older, of which an estimated 8% (data from the ICE-CUB 1 study) were related to critical conditions, of which an estimated 33% (data from the ICE-CUB 1 study) fulfilled the inclusion criteria. Data are not available for the number of hospitals screened for eligibility or the number of or reasons for exclusion prior to randomization.
aInformation on number of patients not eligible or included is not available.
bParticipant recruitment ended when the target sample size was achieved.
Median duration of follow-up in alive patients was of 6 months (interquartile range, 6.0-6.1 months) in both the systematic strategy and the standard practice groups. Panel A shows Kaplan-Meier curves of the unadjusted probability of survival between the systematic strategy group and the standard practice group from emergency department visit to 6 months. Patients from the systematic strategy group had a lower 6-month survival rate vs patients in the standard practice group (Kaplan-Meier estimates, 55.7% [95% CI, 53.2%-58.2%] vs 61.8% [95% CI, 59.4%-64.3%]; P < .001; hazard ratio, 1.24; 95% CI, 1.02-1.51). Panel B shows Kaplan-Meier curves of the inverse probability-weighted adjusted probability of survival from emergency department visit to 6 months. The P value from the inverse probability-weighted Cox regression model is shown in the graph. After adjustments for baseline characteristics, survival rates at 6 months were not significantly different between groups (hazard ratio, 1.10; 95% CI, 0.93-1.31).
eAppendix. Supplemental Methods
eTable 1. List of the Critical Conditions for Inclusion
eTable 2. Detailed List of Initial Clinical Diagnoses of Included Patients
eTable 3. Characteristics of the Triage Process
eTable 4. Number and Characteristics of Protocol Violations
eTable 5. Number of Decisions for ICU Admission to the ICU and Number of Patients Actually Admitted
eTable 6. Characteristics of Patients Admitted to the Intensive Care Unit
eTable 7. Baseline Index of Independence in ADL
eTable 8. Index of Independence in ADL Scale at 6 Months
eTable 9. Additional Data at 6-Month Follow-up
Statistical Analysis Plan
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Guidet B, Leblanc G, Simon T, et al. Effect of Systematic Intensive Care Unit Triage on Long-term Mortality Among Critically Ill Elderly Patients in France: A Randomized Clinical Trial. JAMA. 2017;318(15):1450–1459. doi:10.1001/jama.2017.13889
Does a program to increase intensive care unit (ICU) admission rates among critically ill elderly patients have a beneficial effect on long-term outcomes?
In this cluster-randomized clinical trial of 3036 critically ill patients aged 75 years or older, a recommendation for systematic ICU admission led to a significantly higher ICU admission rate but had no significant effect on mortality at 6 months vs standard practice (adjusted relative risk, 1.05).
A program to promote systematic ICU admission among critically ill elderly patients increased ICU use but did not reduce 6-month mortality.
The high mortality rate in critically ill elderly patients has led to questioning of the beneficial effect of intensive care unit (ICU) admission and to a variable ICU use among this population.
To determine whether a recommendation for systematic ICU admission in critically ill elderly patients reduces 6-month mortality compared with usual practice.
Design, Setting, and Participants
Multicenter, cluster-randomized clinical trial of 3037 critically ill patients aged 75 years or older, free of cancer, with preserved functional status (Index of Independence in Activities of Daily Living ≥4) and nutritional status (absence of cachexia) who arrived at the emergency department of one of 24 hospitals in France between January 2012 and April 2015 and were followed up until November 2015.
Centers were randomly assigned either to use a program to promote systematic ICU admission of patients (n=1519 participants) or to follow standard practice (n=1518 participants).
Main Outcomes and Measures
The primary outcome was death at 6 months. Secondary outcomes included ICU admission rate, in-hospital death, functional status, and quality of life (12-Item Short Form Health Survey, ranging from 0 to 100, with higher score representing better self-reported health) at 6 months.
One patient withdrew consent, leaving 3036 patients included in the trial (median age, 85 [interquartile range, 81-89] years; 1361 [45%] men). Patients in the systematic strategy group had an increased risk of death at 6 months (45% vs 39%; relative risk [RR], 1.16; 95% CI, 1.07-1.26) despite an increased ICU admission rate (61% vs 34%; RR, 1.80; 95% CI, 1.66-1.95). After adjustments for baseline characteristics, patients in the systematic strategy group were more likely to be admitted to an ICU (RR, 1.68; 95% CI, 1.54-1.82) and had a higher risk of in-hospital death (RR, 1.18; 95% CI, 1.03-1.33) but had no significant increase in risk of death at 6 months (RR, 1.05; 95% CI, 0.96-1.14). Functional status and physical quality of life at 6 months were not significantly different between groups.
Conclusions and Relevance
Among critically ill elderly patients in France, a program to promote systematic ICU admission increased ICU use but did not reduce 6-month mortality. Additional research is needed to understand the decision to admit elderly patients to the ICU.
clinicaltrials.gov Identifier: NCT01508819
Quiz Ref IDThe aging of the population leads to an increased demand for intensive care among elderly patients.1 These patients now account for 10% to 20% of all intensive care unit (ICU) admissions, and this trend continues to increase.2 In a context of expenditures control in health care, appropriate intensive care resource utilization is an important issue.2 Yet many physicians have doubts as to whether elderly patients benefit from ICU admission.3 Previous studies have focused on the benefit of intensive care for adult patients.1,4 However, elderly patients have an age-related diminution of physiological reserve, a higher prevalence of chronic diseases, and more common frailty.5 These age-related physiological and pathological changes make elderly patients more vulnerable to stress due to acute illnesses, putting them at high risk of death when critically ill, making the benefit of ICU admission uncertain in this population.6,7
To date, there has been no randomized clinical trial of ICU triage in elderly patients. Observational studies have reported conflicting results: some studies suggested benefits from ICU admission8,9 while others did not.6,10 These uncertainties, coupled with the absence of triage guidelines adapted to elderly patients,3 lead to wide heterogeneity in clinical practices regarding ICU admission among elderly patients.6
The Intensive Care for Elderly–CUB-Réa 2 (ICE-CUB 2) trial was a cluster-randomized clinical trial to determine whether a recommendation for systematic ICU admission in critically ill elderly patients reduces 6-month mortality compared with usual practice.
The trial was approved by the Comité de Protection des Personnes d’Ile-de-France 9. Participants or their surrogate decision makers were informed orally about the trial, and their nonopposition to trial participation was recorded in patient’ files. In accordance with French law, written informed consent was not required because both interventions are part of standard care. Patients who were eligible but incapable of receiving information and for whom a surrogate decision maker was not available might be included by deferred information. These participants were informed about study participation as soon as they were able to understand information. Information was collected during a 6-month follow-up period. Participants were informed that the authorization to use patient data could be withdrawn at any time. Details on steering committee members and conduct of the study are available in the eAppendix in Supplement 1.
The study protocol is available in Supplement 2. In brief, in this cluster-randomized clinical trial conducted in 24 hospitals in France from January 2012 through November 2015, academic and nonacademic hospitals with at least 1 emergency department and 1 ICU were randomly assigned either to the intervention or the control group.
The allocation schedule was independently established by a statistician at the clinical research unit using a computer-generated randomization list. Randomization was stratified by the median annual number of emergency department visits in participating centers (n=44 616), presence or absence of a geriatric ward, and geographical area (Paris area vs other regions in France). Each site allocation was kept secret by the clinical research unit until the training of the study personnel was completed and was revealed to the hospital primary investigators at the beginning of the inclusion period. Due to the study design, no allocation concealment was possible.
Quiz Ref IDIn hospitals assigned to the systematic strategy group (intervention), a program to promote systematic ICU admission was implemented. In this program, emergency department and ICU physicians were asked to systematically recommend an ICU admission for all included patients during the triage process. Other interventions to promote ICU admission included the following: a member of the steering committee visited each center and presented the trial protocol; when including a participant in the trial, the emergency department physician was required to systematically call the attending ICU physician; the ICU physician was required to systematically evaluate the patient at the bedside; and the emergency department and ICU physicians were required to jointly decide whether to admit the patient to the ICU with consideration of participant or surrogate decision-maker opinions about ICU admission. If no ICU bed was available in the hospital, the patient had to be transferred to an ICU located in another hospital. Monthly meetings were organized with the emergency department and ICU staff. Booklets and posters presenting the recommendations for ICU admission were used.
In hospitals assigned to the standard practice (control) group, there was no specific recommendation regarding the ICU triage process. In both groups, the final decision for admission was made by the physicians at the bedside.
All patients aged 75 years or older who arrived in the emergency department were assessed for eligibility. Patients were included if they had one of the preestablished critical conditions listed in eTable 1 in Supplement 1, had preserved functional status as defined by an Index of Independence in Activities of Daily Living score of 4 or higher or not evaluable,11 had preserved nutritional status (defined as absence of cachexia, subjectively assessed by physicians at the bedside), and were free of active cancer. Exclusion criteria were an emergency department stay of more than 24 hours, a secondary referral to the emergency department, and refusal to participate. Patients in whom cancer was diagnosed after inclusion remained in the statistical analysis. Further information on inclusion and exclusion criteria and follow-up are available in the eAppendix in Supplement 1.
The primary outcome was overall mortality at 6 months. Secondary outcomes were ICU admission rate, in-hospital mortality, functional status at 6 months as assessed by the Index of Independence in Activities of Daily Living,11 and quality of life at 6 months as assessed by the 12-Item Short-Form Health Survey.12 The Index of Independence in Activities of Daily Living11 is based on an evaluation of the functional independence or dependence of patients in bathing, dressing, toileting, transferring, continence, and feeding and ranges from 0 (totally dependent) to 6 (independent). The 12-Item Short-Form Health Survey12,13 is a measure of health-related quality of life and includes a physical and mental component; the score ranges from 0 to 100, with higher scores representing better self-reported health. Other secondary outcomes were the characteristics of the triage process: opinions about ICU admission and involvement of physicians and participants in the decision process and the number of ICUs with all beds filled. Caregiver burden14 at 6 months was assessed in 2 centers and is not reported in this article. For patients discharged alive, information on outcomes were obtained through telephone calls, either directly from patients, from patients’ relatives or general practitioners, or from appropriate legal institutions. Data on patients who were lost to follow-up before 6 months were censored at the last follow-up assessment.
The statistical analysis plan is available in Supplement 3. Assumptions based on sample size calculation were based on the ICE-CUB 1 study.6 Considering an estimated 32% 6-month mortality rate in the control group and an estimated intracluster correlation coefficient of 0.01, a sample size of 2802 was required to have 74% power to detect a 6% difference in mortality rates in a 2-sided test at a .05 level of significance. Twenty-four hospitals agreed to participate instead of 20 initially planned; to take into account cluster randomization with inflation dependent on intraclass correlation coefficient, the number of patients to be included was increased to 3000. The absolute reduction of 6% in mortality was established as a compromise resulting in a feasible sample size and a clinically relevant reduction in mortality.15 Recruitment was ultimately ended when the targeted sample size was achieved in each cluster.
Baseline characteristics of patients were analyzed as frequencies and percentages for categorical variables and as medians and interquartile ranges (IQRs) for continuous variables. Bivariable associations were evaluated using the t test for continuous variables and the χ2 or Fisher exact test for categorical variables as appropriate. Variables for all adjusted analyses were age, illness severity, initial clinical diagnosis, seniority of the emergency physician, time of ICU admission, baseline functional status, living place, and type of home support. Generalized estimating equation methods using robust sandwich estimators to estimate the variance-covariance matrix of the regression coefficient estimates were used to account for clustering. Binary outcomes (ICU admission rate, in-hospital death, death within 6 months, change in Index of Independence in Activities of Daily Living11) were analyzed using logistic regression models. Absolute risk differences and relative risks (RRs) were derived from logistic regression models and 95% confidence intervals for these measures were obtained using nonparametric bootstrap methods with 1000 samples.16 The crude overall survival at 6 months was estimated by the Kaplan-Meier method and compared using a log-rank test. The 6-month survival adjusted for baseline characteristics was estimated using a Cox model. Adjusted survival curves were produced using an inverse probability-weighted Kaplan-Meier estimation. Significance was tested using a Cox regression model weighted by the same weights (inverse probability-weighted Cox). Health-related quality of life at 6 months was analyzed using linear regression models. We used multiple imputation for participants with missing data, using predictive mean matching for continuous variables, logistic regression for binary data, and polytomous regression for (unordered) categorical data. Ten imputations were drawn.
The analyses were performed on an intention-to-treat basis according to the prespecified analysis plan, without planned interim analysis. A post hoc exploratory analysis was performed to compare the characteristics of patients admitted to the ICU in each group. All analyses were performed at a 2-sided α=.05; a P<.05 was considered statistically significant. All analyses were performed by A.B. with R software, version 3.2.2 (R Foundation for Statistical Computing).
Between January 2012 and April 2015, a total of 3037 patients were enrolled in the trial, with 1519 patients in 11 hospitals randomized to the systematic strategy group and 1518 patients in 13 hospitals randomized to the standard practice group (Figure 1). The recruiting rate was higher in the systematic strategy group compared with the standard practice group. To achieve the total number of participants needed, the recruiting period was extended in the hospitals randomized to the standard practice group. The mean inclusion period was 22.5 months in the systematic strategy group and 28.5 months in the standard practice group. One patient subsequently withdrew consent, leaving a total of 3036 patients. There were 12 medical and 12 mixed (medical and surgical) ICUs.
The baseline characteristics of the patients are presented in Table 1. The median age at inclusion was 85 years (IQR, 81-89 years); 45% (1361/3036) were men. The most frequent initial clinical diagnoses for hospital admission were septic shock (413/3036 [13.6%]), acute respiratory failure requiring noninvasive ventilation (347/3036 [11.4%]), severe pneumonia (250/3036 [8.2%]), and cardiac insufficiency requiring noninvasive ventilation (218/3036 [7.2%]) (a complete list is available in eTable 2 in Supplement 1). Patients in the systematic strategy group had a higher severity of illness at admission, as reflected by a higher Simplified Acute Physiology Score III score.18
In the systematic strategy group, physicians inquired more often about patients’ or surrogate decision makers’ opinions about ICU admission (750/1518 [49%] vs 359/1518 [24%]; difference in proportions, 25%; 95% CI, 22%-29%; P < .001), intensive care physicians were more often involved in the triage process (1474/1518 [97%] vs 938/1518 [62%]; difference in proportions, 35%; 95% CI, 33%-38%; P < .001) and were more favorable to an ICU admission (1111/1474 [75%] vs 623/938 [66%]; difference in proportions, 9%; 95% CI, 5%-13%; P < .001), and patients were more favorable to an ICU admission (414/470 [88%] vs 145/220 [66%]; difference in proportions, 22%; 95% CI, 15%-29%; P < .001) than in the standard practice group. More information about the triage process is available in Table 2 and eTable 3 in Supplement 1. Information on protocol violations is available in eTable 4 in Supplement 1.
At 6 months, there were a total of 1273 deaths, 685 deaths in the systematic strategy group and 588 deaths in the standard practice group (Table 3). Patients in the systematic strategy group had an increased risk of death at 6 months (685/1518 [45%] vs 588/1518 [39%]; difference in proportions, 6% [95% CI, 3%-10%]; P < .001; RR, 1.16 [95% CI, 1.07-1.26]), but the difference did not remain significant after adjustments for baseline characteristics (RR, 1.05; 95% CI, 0.96-1.14). Crude and adjusted survival curves according to group assignment are presented in Figure 2.
Intensive care unit admission rate was higher in the systematic strategy group (932/1518 [61%] vs 516/1518 [34%]; difference in proportions, 27% [95% CI, 24%-31%]; P < .001; RR, 1.80 [95% CI, 1.66-1.95]), and the difference remained significant after adjustments for baseline characteristics (RR, 1.68; 95% CI, 1.54-1.82) (Table 3). One patient for which a decision for ICU refusal had been made was finally admitted to the ICU (eTable 5 in Supplement 1).
A post hoc analysis was conducted to compare patients admitted to the ICU in each group (eTable 6 in Supplement 1). Patients admitted to the ICU in the systematic strategy group had a higher Simplified Acute Physiology Score III18 score (difference in medians, 3; 95% CI, 2-5; P < .001), more often underwent mechanical ventilation (374/884 [42%] vs 147/470 [31%]; difference in proportions, 11%; 95% CI, 6%-16%; P < .001), less often underwent noninvasive ventilation (251/884 [28%] vs 170/470 [36%]; difference in proportions, –8%; 95% CI, –13% to –3%; P < .001) and less often underwent fluid resuscitation (177/835 [21%] vs 151/469 [32%]; difference in proportions, –11%; 95% CI, –16% to –6%; P < .001) than patients admitted to the ICU in the standard practice group. The ICU and hospital length of stay were not significantly different between groups (difference in medians, respectively, of 1 [95% CI, –0.5 to 1] days and 1 [95% CI, –1 to 3] days). The overall mortality rate in the ICU was 23% (328/1448) and was not significantly different between groups (220/932 [24%] for systematic strategy vs 108/516 [21%] for standard practice; difference in proportions, 3%; 95% CI, –2% to 7%; P = .27).
The overall in-hospital mortality was 25.6% (777/3036). In-hospital mortality was higher in the systematic strategy group than in the standard practice group (451/1518 [30%] vs 326/1518 [21%]; difference in proportions, 9% [95% CI, 5%-11%]; P < .001; RR, 1.39 [95% CI, 1.23-1.57]), and the difference remained significant after adjustments for baseline characteristics (RR, 1.18; 95% CI, 1.03-1.33) (Table 3). Patients discharged alive from the hospital in the systematic strategy group had an increased length of hospital stay vs patients in the standard practice group (16.8 [SD, 16.2] days in the systematic strategy group and 13.6 [SD, 20.1] days in the standard practice group; difference in means, 3.2 days; 95% CI, 1.7-4.7 days; P < .001).
There was a greater decrease from baseline Index of Independence in Activities of Daily Living at 6 months in the systematic strategy group than in the standard practice group (median of the difference between follow-up and baseline scores, –0.5 [IQR, –2.0 to 0.0] vs –0.5 [IQR, –1.5 to 0.0]; P = .02; difference in means, –0.20; 95% CI, –0.37 to –0.03) (detailed baseline and follow-up data are reported in eTables 7 and 8 in Supplement 1). The probability of a decrease in at least 1 of the Index of Independence in Activities of Daily Living18 domains was not significantly different between groups after adjustments for baseline characteristics (RR, 1.02; 95% CI, 0.99-1.05) (Table 3). Self-reported physical quality of life at 6 months was not significantly different between groups (mean score, 36.7 vs 36.2; difference in means, 0.5 [95% CI, –0.6 to 1.5]). Self-reported mental quality of life at 6 months was higher in the systematic strategy group (mean score, 44.6 vs 43.7; difference in means, 0.9 [95% CI, 0.1-1.6]) (Table 3). Additional data at 6-month follow-up are available in eTable 9 in Supplement 1.
Quiz Ref IDIn this trial, a program to promote systematic ICU admission of critically ill elderly patients led to a higher ICU admission rate and hospital mortality but after adjustment for baseline characteristics had no significant effect on mortality, functional status, or physical health-related quality of life at 6 months. The observed statistically significant difference in median mental health-related quality of life did not reach the minimum clinically important difference.13
These results are consistent with the ICE-CUB 1 study,6,19 a prospective, multicenter observational study of 2646 critically ill patients aged 80 years or older, which suggested no mortality benefit at 6 months after ICU admission (50.6% vs 50.7%). Other observational studies reported controversial results: 2 studies suggested decreased mortality at 1 month8,9 in patients admitted vs not admitted to the ICU, whereas 1 study did not observe mortality benefit at 1 year.10 Limitations of these studies are their retrospective or observational design without randomization, their heterogeneity in age cutoff for inclusion and in adjustments for known prognostic factors, and the absence of consideration of the triage process by the emergency department physicians before the ICU referral.20
The mortality rates were also consistent with available data in the literature. Recent observational data on critically ill elderly patients admitted to the ICU suggested in-hospital mortality rates ranging from 24% to 40%,1,10,21-23 3-month mortality rates from 39% to 41%,1,17,24 6-month mortality rates from 37% to 51%,1,6,25 and 1-year mortality rates from 44% to 68%.1,10,17,21,23 In the current trial, the selection of patients with preserved baseline functional and nutritional status and free of active cancer may explain the observed low rates of in-hospital (26%) and 6-month (42%) mortality compared with observational data. The higher in-hospital mortality rate observed in the systematic strategy group may be explained in part by the fact that a higher ICU admission rate in the intervention group might have precipitated early discussions about or more frequent withdrawals of life-sustaining therapies, possibly leading to a higher mortality rate in the systematic strategy group. However, the ICU and hospital lengths of stay and the number of patients with at least 1 organ in need of support were similar between the 2 groups.
To our knowledge, this is the first randomized clinical trial evaluating the effect of ICU triage on long-term mortality in an elderly population. Randomization by cluster (hospital) allowed evaluation of the effect of ICU triage without difficulties incurred by ethical considerations of randomization for ICU admission at an individual patient level. The intervention program led to different ICU admission rates between groups. Furthermore, senior physicians were more frequently involved in the triage decision-making process, and the decisions were frequently shared between physicians. Quiz Ref IDHowever, despite a recommendation for systematic ICU admission in the intervention group, more than one-third of patients were not admitted to the ICU. This was expected, as physicians had the final decision for ICU admission and could refuse an ICU admission even if the hospital was randomized to the intervention group.
This trial has several strengths. First, the design takes into account the 2 steps of the triage process by both emergency department and intensive care physicians. This avoided potential bias related to variation in triage criteria for ICU admission proposal by emergency department physicians. Second, participants were patients without long-term adverse outcome factors as identified in the ICE-CUB 1 study,6 to avoid inclusion of patients with very high expected mortality. Third, the trial was pragmatic, which contributes to the generalizability of the results. Fourth, in addition to survival analyses, this trial assessed functional status and quality of life, which are important and relevant outcomes in the elderly population. Fifth, there were very few protocol violations, allowing for an intention-to-treat analysis, and few patients were lost to follow-up.
This study also has several limitations. First, the recruitment period in the standard practice cluster was longer that in the systematic strategy cluster, which could have introduced confounding due to secular changes. Second, because of the nature of the intervention, no blinding to group assignment was possible. However, the effect of the nonblinded design on 6-month mortality is considered low. Third, data on withdrawal of life-sustaining therapies were not collected. Fourth, the potential benefits of ICU admission might be confounded by recruitment of patients who were more severely ill in the systematic strategy group. However, results were adjusted for several baseline characteristics, including illness severity. Fifth, the benefits of increased ICU admission could accrue only to patients who would normally have received floor care but instead received ICU care. In this study, the question of whether benefit might accrue to patients on the margin was not addressed. However, because of the design of the study, variation in individual probability of ICU admission is likely to be small. Sixth, a qualitative approach to understand why patients were not admitted to the ICU was not conducted. Seventh, differences in the quality of care provided in the wards may affect the outcome. For example, ward admission as an alternative to the ICU might partially explain the negative results observed in the present study when patients were admitted to wards providing very good care. The cluster design and sample size should reduce this potential bias because hospitals with emergency departments and ICUs were randomized. Moreover, patients already in the hospital (secondary transfer) or admitted from another hospital were excluded to minimize the effect of previous quality of care on prognosis. Nonetheless, the hospitals that had lower ICU admission rates at baseline may in particular have developed higher-quality ward care; thus, a strategy to boost ICU admission rates may not have yielded the same gains in outcome in such centers as in other settings.
Quiz Ref IDThe findings of this study may be informative for health care delivery from a hospital perspective. When considering the increasing demand for intensive care among elderly patients, the importance of health care resource allocation and expenditure control, and the possible absence of long-term benefit of intensive care, systematic ICU admission of all critically ill elderly patients might not be warranted. However, this study should not be interpreted as suggesting that no elderly patient should be admitted to the ICU. Because of substantial uncertainty in outcomes among individual patients, there is a need to systematically and thoughtfully assess the potential benefits and harms of ICU admission for every elderly patient presenting with critical illness.
Among critically ill elderly patients in France, a program to promote systematic ICU admission increased ICU use but did not reduce 6-month mortality. Additional research is needed to understand the decision to admit elderly patients to the ICU.
Corresponding Author: Bertrand Guidet, MD, Medical Intensive Care Unit, Saint-Antoine Hospital, 184, rue du Faubourg Saint-Antoine, Paris, 75012, France (email@example.com).
Accepted for Publication: August 29, 2017.
Published Online: September 27, 2017. doi:10.1001/jama.2017.13889
Author Contributions: Dr Boumendil had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Concept and design: Guidet, Simon, Garrouste-Orgeas, Thomas, Pateron, Boumendil.
Acquisition, analysis, or interpretation of data: Guidet, Leblanc, Woimant, Quenot, Ganansia, Maignan, Yordanov, Delerme, Doumenc, Fartoukh, Charestan, Trognon, Galichon, Javaud, Patzak, Azerad, Boumendil.
Drafting of the manuscript: Guidet, Leblanc, Thomas, Boumendil.
Critical revision of the manuscript for important intellectual content: Guidet, Leblanc, Simon, Woimant, Quenot, Ganansia, Maignan, Yordanov, Delerme, Doumenc, Fartoukh, Charestan, Trognon, Galichon, Javaud, Patzak, Garrouste-Orgeas, Thomas, Azerad, Pateron, Boumendil.
Statistical analysis: Guidet, Leblanc, Boumendil.
Obtained funding: Guidet, Simon, Boumendil.
Administrative, technical, or material support: Simon, Quenot, Ganansia, Maignan, Yordanov, Javaud, Thomas, Azerad.
Supervision: Guidet, Simon, Garrouste-Orgeas, Thomas, Pateron, Boumendil.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Guidet reports receipt of lecture fees from Griffols and LFB and grants from LFB. Dr Simon reports receipt of grants from AstraZeneca, Daiichi-Sankyo, Lilly, GlaxoSmithKline, Merck Sharpe and Dohme, Novartis, and Sanofi and board membership, consultancy, or lecture fees from AstraZeneca, Astellas, Merck Sharpe and Dohme, Novartis, and Sanofi. No other disclosures were reported.
Funding/Support: This study was supported by Assistance Publique–Hôpitaux de Paris, Département de la Recherche Clinique et du Développement (project code K100103/IDRCB 2011-A00758-33). The study was funded by the Programme Hospitalier de Recherche Clinique 2010 of the French Ministry of Health and (grant PHRC 2010 AOM 10154 K100103).
Role of the Funder/Sponsor: The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; or decision to submit the manuscript for publication.
Group Information: ICE-CUB 2 Study Network: Bertrand Guidet, MD, Dominique Pateron, MD, Erwan Debuc, MD, Youri Yordanov, MD (top 10 recruiter), Ariane Boumendil, PhD, Caroline Thomas, MD; Didier Dreyfuss, MD, Jean-Damien Ricard, MD, PhD, Patrick Brun, MD, Christophe Leroy, MD, Yves Cohen, MD, Frédéric Adnet, MD, PhD, Maguy Woimant, MD (top 10 recruiter), Jean-Paul Mira, MD, PhD, Benoît Doumenc, MD (top 10 recruiter), Khalil Tku, MD; Thomas Similowski, MD, PhD, Bruno Riou, MD, PhD, Pierre Hausfater, MD, PhD, Samuel Delerme, MD (top 10 recruiter), Jean-Pierre Quenot, MD, PhD (top 10 recruiter), Didier Honnart, MD, Jean-François Timsit, MD, PhD, Pierrick Guérin, MD, Françoise Carpentier, MD, Maxime Maignan, MD (top 10 recruiter), Foued Makhlou, MD, Jean-François Poussel, MD, Yohann Picard, MD, François Braun, MD, Pauline Trognon, MD (top 10 recruiter), François Fourrier, MD, Patrick Goldstein, MD, Marie Girot, MD, Pierre Gosselin, MD, Francesco Santoli, MD, Pierre Charestan, MD (top 10 recruiter), Claire Poly, MD, Hervé Mentec, MD, Catherine Le Gall, MD, Karima Sahraoui, MD; Christophe Baillard, MD, Nicolas Javaud, MD (top 10 recruiter), Benoît Misset, MD, Maité Garrouste-Orgeas MD, Olivier Ganansia, MD (top 10 recruiter), François-Xavier Rooryck, MD, Jean Luc Aim, MD, Abudlrazak El Rifai, MD, Jean Reignier, MD, PhD, Laurent Martin-Lefevre, MD, Philippe Fradin, MD, Claire Mauriat, MD, Emelyne Cwicklinski, MD, Michel Slama, MD, PhD, Hervé Dupont, MD, PhD, Christine Ammirati, MD, Justine Gallou, MD, Muriel Fartoukh, MD, PhD, Michel Djibre, MD, Patrik Ray, MD, PhD (top 10 recruiter), Edwin Rouff, MD, Bertrand Souweine, MD, PhD, Ali Ait Hssain, MD, Jeannot Schmidt, MD, Daniel Pic, MD, Farès Moustafa, MD, Alain Mercat, MD, PhD, Nicolas Lerolle, MD, PhD, Pierre-Marie Roy, MD; Frédéric Baud, MD, PhD, Patrick Plaisance, MD, Sophie Montagnon, MD, Bertrand Galichon, MD (top 10 recruiter), Michel Wolff, MD, Bruno Mourvillier, MD, PhD, Enrique Casalino, MD, Christophe Choquet, MD, Julien Bernard, MD, Gaëlle Juillien, MD, Jean-Yves Fagon, MD, Emmanuel Guerot, MD, Philippe Juvin, MD, Anabela Patzak, MD (top 10 recruiter), Bruno Verdière, MD, Vincent Ioos, MD, Marie-Clément Kouka, MD, Audrey Berthoumieu, MD, Christian Richard, MD, PhD, Raphael Maurice, MD, Sophie Sarnel, MD, Stéphane Diez, MD, Antoine Vieillard Baron, MD, PhD, Sébastien Beaune, MD, Julie Grenet, MD; Unité de Recherche Clinique Paris Île-de-France Ouest: Sylvie Azerad, PharmD; Department of Anesthesiolgy and Critical Care–Laval University: Guillaume Leblanc, MD; Sorbonne Universités–Pierre et Marie Curie: Tabassome Simon, MD, PhD.
Additional Contributions: We thank Philippe Aegerter, MD, PhD, Unité de Recherche Clinique Ouest–APHP, for creation of the database, all of the physicians and nurses from the study sites for their valuable cooperation with the study, and the staff from the Unité de Recherche Clinique and Clinical Research Unit–Paris Est: Laura Wakselman, MSc, Sarah Salhi, MSc (project coordination), Amal Abderrahim, MSc, Vanessa Lemaître, Amina Rasnaama, Gobiga Visagamoorthy, Arnaud Fruchart, MSc, Cécile Straub, PhD, Élodie Bouvier, PhD, Emeline Julita, PhD, Florian D’arco, MSc, Meena Devadasan, MSc, Rabia Moktari, MSc, Samira Aklil, MSc, Sarah Allouche, MSc, Wissem Boucenna, MSc (clinical research assistants–clinical research unit), and Hélène Fromentin, MSc, Judith Leblanc, PhD, and Maria Martin (study nurses–clinical research center). No compensation was provided for these contributions.
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