- Open Access
Immunocompromised patients with acute respiratory distress syndrome: secondary analysis of the LUNG SAFE database
- Andrea Cortegiani1Email authorView ORCID ID profile,
- Fabiana Madotto2,
- Cesare Gregoretti1,
- Giacomo Bellani3, 4,
- John G. Laffey5, 6, 7,
- Tai Pham6, 7,
- Frank Van Haren8, 9,
- Antonino Giarratano1,
- Massimo Antonelli10,
- Antonio Pesenti11, 12,
- Giacomo Grasselli11 and
- LUNG SAFE Investigators and the ESICM Trials Group
© The Author(s). 2018
- Received: 26 February 2018
- Accepted: 22 May 2018
- Published: 12 June 2018
The aim of this study was to describe data on epidemiology, ventilatory management, and outcome of acute respiratory distress syndrome (ARDS) in immunocompromised patients.
We performed a post hoc analysis on the cohort of immunocompromised patients enrolled in the Large Observational Study to Understand the Global Impact of Severe Acute Respiratory Failure (LUNG SAFE) study. The LUNG SAFE study was an international, prospective study including hypoxemic patients in 459 ICUs from 50 countries across 5 continents.
Of 2813 patients with ARDS, 584 (20.8%) were immunocompromised, 38.9% of whom had an unspecified cause. Pneumonia, nonpulmonary sepsis, and noncardiogenic shock were their most common risk factors for ARDS. Hospital mortality was higher in immunocompromised than in immunocompetent patients (52.4% vs 36.2%; p < 0.0001), despite similar severity of ARDS. Decisions regarding limiting life-sustaining measures were significantly more frequent in immunocompromised patients (27.1% vs 18.6%; p < 0.0001). Use of noninvasive ventilation (NIV) as first-line treatment was higher in immunocompromised patients (20.9% vs 15.9%; p = 0.0048), and immunodeficiency remained independently associated with the use of NIV after adjustment for confounders. Forty-eight percent of the patients treated with NIV were intubated, and their mortality was not different from that of the patients invasively ventilated ab initio.
Immunosuppression is frequent in patients with ARDS, and infections are the main risk factors for ARDS in these immunocompromised patients. Their management differs from that of immunocompetent patients, particularly the greater use of NIV as first-line ventilation strategy. Compared with immunocompetent subjects, they have higher mortality regardless of ARDS severity as well as a higher frequency of limitation of life-sustaining measures. Nonetheless, nearly half of these patients survive to hospital discharge.
ClinicalTrials.gov, NCT02010073. Registered on 12 December 2013.
- Acute respiratory failure
- Immunocompromised patients
- Mechanical ventilation
- Noninvasive ventilation
In recent decades, significant advances in the management of immunocompromised patients have led to improved survival rates [1–3]. Hence, intensive care unit (ICU) admission and invasive life-sustaining treatments are offered with increasing frequency to these patients [3, 4]. However, several studies show that the prognosis of critically ill patients with active malignancies or immunodeficiency remains poor, especially when the cause of ICU admission is acute respiratory distress syndrome (ARDS) requiring invasive mechanical ventilation (IMV) [5–11]. Data about incidence, causes, management, and outcomes of ARDS in immunocompromised patients are scarce. The best ventilatory strategy in this population is still uncertain, and available literature data on the role of noninvasive ventilation (NIV) are conflicting [12–22]. Recently, researchers in the Large Observational Study to Understand the Global Impact of Severe Acute Respiratory Failure (LUNG SAFE study) investigated the incidence, management, and clinical outcomes in patients with acute hypoxemic respiratory failure (AHRF) requiring ventilatory support, with a specific focus on ARDS . This aim of this post hoc subgroup analysis was to describe the epidemiology, clinical characteristics, ventilatory management (with particular attention to the use of NIV), and outcomes of ARDS in the subset of patients with clinically significant immunodeficiency.
LUNG SAFE: patients, study design, and data collection
LUNG-SAFE was an international, multicenter, prospective observational cohort study conducted in a 459 ICUs worldwide. During 4 consecutive weeks in the winter of 2014 (February–March 2014 in the Northern Hemisphere and June–August 2014 in the Southern Hemisphere), participating ICUs enrolled patients undergoing IMV or NIV. Participating ICUs obtained ethics committee approval and either patient consent or waiver of consent as per local guidelines. National coordinators, site investigators, and endorsing societies are listed in Additional file 1. Exclusion criteria were age < 16 years or lack of informed consent when required. Patients were screened daily for AHRF, defined as follows: (1) ratio of partial pressure of arterial oxygen to fraction of inspired oxygen (PaO2/FiO2) ≤ 300 mmHg while receiving IMV or NIV with positive end-expiratory pressure (PEEP) ≥ 5 cmH2O and (2) new radiological pulmonary parenchymal abnormalities. In patients with AHRF, a more detailed set of data was collected to determine whether they met the Berlin definition criteria for ARDS. Data on comorbidities, etiology of AHRF, and risk factors for ARDS were recorded. Data on arterial blood gases, ventilatory support, use of adjunctive therapies (e.g., prone positioning, extracorporeal membrane oxygenation, neuromuscular blockade), severity of ARDS, and other organ involvement by modified nonpulmonary Sequential Organ Failure Assessment (SOFA) score  were collected on selected days. The following clinical endpoints were assessed: ICU and hospital survival, censored at 90 days after enrollment; duration of mechanical ventilation; changes in ARDS severity; and decision to withhold or withdraw life-sustaining therapies. A full description of the methods of the LUNG SAFE study, including the full study protocol, case report form (CRF), sample size, and quality control, can be found in the original study paper .
Immunocompromised patient cohort and definitions
We defined “immunocompromised” patients as all patients with at least one of the following conditions listed in the LUNG SAFE CRF: (1) immunosuppression (defined as viral immunosuppression, neoplastic disease, immunosuppressive drugs including steroids, chemotherapy, or congenital immunosuppression), (2) active hematologic malignancy (i.e., still requiring treatment), and (3) active neoplasm (i.e., a neoplasm that has not been resected, still requires treatment, or with metastasis). Patients without these conditions were classified as “controls.” For the purposes of this analysis, the study population was restricted to the subset of patients fulfilling ARDS criteria on day 1 or 2 following the onset of AHRF.
In regard to management, patients were subdivided in three ventilation subgroups: (1) IMV, defined as patients invasively ventilated from day 1, independently of the type of support received after the eventual extubation; (2) NIV, defined as patients treated exclusively with NIV from day 1 to study exit (i.e., ICU discharge or death); and (3) NIV failure, defined as patients initially treated with NIV and subsequently intubated during the study period. The term NIV encompassed all forms of NIV modes and interfaces (including continuous positive airway pressure). ARDS severity was assessed from the first to the second day from ARDS onset, according to the Berlin definition criteria: mild (PaO2/FiO2 201–300 mmHg), moderate (PaO2/FiO2 101–200 mmHg), and severe (PaO2/FiO2 ≤ 100 mmHg). Changes in ARDS severity were evaluated in patients staying in the ICU for at least 2 days, and they were classified into four categories: (1) no change, (2) worsening (shift to a more severe category), (3) improvement (shift to a less severe category), and (4) resolution. Duration of invasive ventilation was computed as the number of days that the patient required IMV up to day 28. Survival was evaluated at ICU and hospital discharge or at day 90, whichever event occurred first.
Continuous variables were expressed as mean (SD) or median (IQR), and categorical variables were presented as count and percent. No assumptions were made for missing data, which were rare . To assess differences between groups, we used Student’s t test or the Wilcoxon rank-sum test (according normality distribution of data) for continuous variables and the χ2 or Fisher’s exact test (according sample size) for proportions. We used analysis of variance or the Kruskal-Wallis test (as appropriate) and the χ2 test (or Fisher’s exact test) to assess differences among the NIV, NIV failure, and IMV groups. The Bonferroni correction was applied to determine significance in the setting of multiple comparisons.
To evaluate factors associated with the use of NIV, we applied a multivariable logistic regression model, and the independent predictors (demographic characteristics, comorbidities, ARDS risk factors, and clinical parameters concerning the illness severity of ARDS onset) were identified through a stepwise regression approach. This approach combines forward and backward selection methods (combined with a significance level of 0.05 for both entry and retention) in an iterative procedure to select predictors in the final multivariable model. This approach was also applied to identify factors associated with hospital mortality in immunocompromised patients. In this case, the stepwise approach also evaluated as possible predictors ventilator setting variables measured at ARDS onset.
Survival analysis was performed according to the Kaplan-Meier method. We assumed that patients discharged alive from the hospital before 90 days were alive on day 90. The log-rank test was used to compare survival curves among groups.
All p values were two-sided, and values less than 0.05 were considered significant. Statistical analyses were carried out with R version 3.3.3 (R Project for Statistical Computing; https://www.r-project.org/) and SAS version 9.4 software (SAS Institute, Cary, NC, USA).
Baseline patient characteristics
Patients characteristics in immunocompetent (Control) and immunocompromised (Study) groups
(n = 2229)
(n = 584)
Sex, age, and BMI
Women, n (%)
Age, yr, mean ± SD
61.6 ± 17.1
60.3 ± 15.5
BMI (kg/m2), mean ± SD
28.1 ± 9.2
25.5 ± 5.8
Comorbidities, n (%)
Hearth failure (NYHA classes III-IV)
Chronic renal failure
Chronic liver failure (Child-Pugh class C)
ARDS risk factors, n (%)
Aspiration of gastric contents
Other risk factors
Cause of immunosuppression, n (%)
Known (hematologic and/or active neoplasm)
Illness severity at ARDS onset
Nonpulmonary SOFA scorea, mean ± SD
First day of ARDS
6.2 ± 4.1
6.5 ± 4.0
Second day of ARDS
6.3 ± 4.3
6.7 ± 4.3
PaO2/FiO2 ratio, mmHg, mean ± SD
161.3 ± 67.1
157.2 ± 67.9
Mild ARDSb, n (%)
Moderate ARDSb, n (%)
Severe ARDSb, n (%)
Type of ventilatory support, ventilator setting, and adjunctive measure/therapies
Figure 1 summarizes the type of ventilatory support in enrolled patients. On day 1 of ARDS, IMV was the most frequent type of ventilatory approach in both groups; however, NIV use as first-line treatment was significantly more frequent in immunocompromised than in immunocompetent patients (20.9% vs 15.9%; p = 0.0044). The proportion of patients remaining on NIV from day 1 to study exit (NIV subgroup) was similar, whereas the incidence of NIV failure was significantly higher in immunocompromised patients (10.1% vs 6.4%; p = 0.0021).
A multivariable logistic regression model revealed that, adjusting on confounders, immunodeficiency was independently associated with the use of NIV (OR, 1.567; 95% CI, 1.217–2.017; p = 0.0005). Other factors associated with NIV are shown in Additional file 3.
Additional file 4 compares the ventilator settings on the first day of ARDS between immunocompromised and control patients: FiO2 and respiratory rate and PEEP were statistically significantly higher in immunocompromised patients, but the difference for PEEP was not clinically relevant. There was no difference in tidal volume, peak and plateau pressures, and the proportion of patients with spontaneous ventilation. No significant differences were observed in adjunctive therapies, except for a significantly higher use of continuous neuromuscular blocking agents in the immunocompromised group (22.6% vs 18.5%; p = 0.0266) (Additional file 5). Additional file 6 describes ventilator settings in immunocompromised and immunocompetent (control) patients, stratified by the type of ventilator support (IMV, NIV, NIV failure).
Clinical endpoints in immunocompetent (Control) and immunocompromised (Study) patients
(n = 2229)
(n = 584)
IMV during ICU stay, n (%)
NIV success during ICU stay, n (%)
NIV failure during ICU stay, n (%)
Duration of mechanical ventilation, d, median (Q1–Q3)
Progression/regression of ARDSa, n (%)
Limitation of life-sustaining measures, n (%)
Decision to withhold life-sustaining measures
Decision to withdraw life-sustaining measures
Decision to withhold or withdraw life-sustaining measures
ICU mortalityb, n (%)
Hospital mortalityc, n (%)
Patients with limitations of life-sustaining measuresd
Clinical endpoints in immunocompromised (Study) patients according to ventilation subgroup
(n = 462)
(n = 63)
(n = 59)
Duration of mechanical ventilation, d, median (Q1–Q3)
Progression/regression of ARDSa, n (%)
Limitation of life-sustaining measures, n (%)
Decision to withhold life-sustaining measures
Decision to withdraw life-sustaining measures
Decision to withhold or withdraw life-sustaining measures
Before IMV or NIV start
ICU mortalityd, n (%)
Hospital mortalitye, n (%)
Patients with limitations of life-sustaining measuresf
Additional file 11 describes patient characteristics and clinical endpoints in immunocompetent (control) patients according to type of ventilator support. Because the lack of a precise definition of the cause of immunosuppression in a relevant proportion of patients may affect the strength of our findings, we compared baseline patient characteristics and clinical outcomes in patients with a “known” cause of immunosuppression (i.e., those with active hematologic malignancy or active neoplasm) and in patients with an unspecified (“unknown”) cause of immunosuppression (i.e., those indicated in the CRF with the generic term immunosuppression). The results of this analysis are reported in Additional file 12. Briefly, patients with an unspecified cause of immunosuppression were significantly younger (55.7 ± 15.6 vs 63.1 ± 14.8 years; p < 0.0001) and had lower hospital mortality (41.6% vs 59.3%; p < 0.0001) and fewer limitations of life-sustaining measures (27.3% vs 37.3%; p = 0.013).
The main findings of this analysis can be summarized as follows: immunosuppression is frequent in ARDS patients; causes of ARDS in immunocompromised patients are mainly related to infection; immunocompromised patients are more likely to receive NIV as first-line ventilatory treatment; and the outcome of ARDS is worse and limitation of life-sustaining measures is more frequent in immunocompromised patients. Among the 2813 ARDS patients included in the LUNG SAFE study, one-fifth were immunocompromised, and 62.7% of them had an active malignancy. In line with recent literature [18, 21], a diagnosis of active malignancy is considered as a cause of immunosuppression, owing to the negative effects on immune function of anticancer treatments and of the malignancy itself. All other causes of immune deficiency were identified by the generic variable “immunosuppression.” To the best of our knowledge, this was the first prospective, multicenter study conducted on a large cohort of immunocompromised patients with a diagnosis of ARDS according to Berlin definition criteria , whereas previous studies relied on the definition of the American-European Consensus Conference on ARDS . As expected, ARDS in immunocompromised patients was associated mainly with an infectious cause. Pneumonia, noncardiogenic shock, and pulmonary vasculitis were significantly more frequent in immunocompromised patients, whereas other risk factors for ARDS were more frequently represented in the control group.
Immunocompromised subjects had a significantly higher ICU and hospital mortality, despite similar ARDS severity and nonpulmonary SOFA score. Another subanalysis of the same database confirmed that active neoplasm, hematologic malignancies, and immunosuppression are independently associated with increased mortality . In addition, the higher frequency of limitation of life-sustaining measures (probably as a result of perceived futility) may have contributed to the increased mortality of immunocompromised patients . This is in line with the results of Laffey et al., who found that immunosuppression and cancer were among the factors associated with increased likelihood of limitation of life-sustaining therapies .
Hospital mortality of our patients was lower than that (64%) reported by Azoulay et al. in a large retrospective analysis of 1004 patients with cancer and ARDS admitted to the ICU over a period of 21 years . In that study, mortality did drop from 89% in the 1990–1995 period to 52% in the 2006–2011 period, matching the mortality rate of our population.
The actual advantage of ICU admission of immunocompromised patients remains debated [3, 4, 10, 29, 30]. Our results demonstrate that almost 50% of immunocompromised patients with ARDS survive to hospital discharge, and this may support the decision to offer them at least an “ICU trial” . Interestingly, our data show that once immunocompromised patients are intubated and invasively ventilated, they are managed very similarly to the general ARDS population with regard to ventilator settings and use of adjunctive therapies. As an example, the use of advanced “rescue” treatments (such as prone positioning and even extracorporeal membrane oxygenation) was similar between immunocompromised and control patients.
Two important questions on the optimal ventilatory management of AHRF in immunocompromised patients remain unanswered. First, is NIV the optimal first-line ventilatory support? Two randomized controlled trials conducted almost 20 years ago showed that NIV, compared with standard oxygen therapy, significantly reduces the rate of intubation and mortality [16, 17], but these findings have not been confirmed in more recent studies. A recent randomized trial on 374 immunocompromised patients with AHRF did not find any benefit of NIV over standard oxygen therapy . Similarly, a post hoc analysis on immunocompromised patients enrolled in a large randomized trial comparing different noninvasive oxygenation strategies showed that first-line NIV was associated with the highest risk of intubation and mortality compared with standard oxygen and high-flow nasal cannula (HFNC) oxygen . In our study, 20.9% of immunocompromised patients received NIV as first-line ventilatory approach compared with 15.9% of controls, and the multivariable analysis revealed that immunodeficiency was independently associated with the use of NIV. This frequency of use of NIV equals exactly that reported by Gristina in a large population of patients with hematologic malignancies admitted to ICU in the years 2002–2006 . In Azoulay’s study, the global rate of NIV application was 38.6%, but it decreased over the years, dropping to 26% in the period 2006–2011 . In our study, patients treated exclusively with NIV had significantly lower mortality than patients requiring invasive ventilation. Of note, the majority of NIV patients who died had a decision of limitation of life-sustaining measures. Importantly, whereas ARDS severity was not different among ventilation subgroups, NIV patients had a markedly lower nonpulmonary SOFA score (Additional file 2: Table S1), indicating that patients with more severe organ failures were more frequently treated with invasive ventilatory support. However, the multivariable regression analysis did not identify the need for invasive ventilation as an independent predictor of death. This represents a major difference with Azoulay’s study, where IMV (especially after failure of NIV) was a strong predictor of poor outcome . Again, this can be explained at least in part by considering that Azoulay’s study included patients from the year 1990, when the techniques of mechanical ventilation were completely different and protective ventilation was certainly not the standard of care.
The impact of NIV failure on patients’ outcomes is the second important issue. We observed a significantly higher incidence of NIV failure in immunocompromised patients than in controls, in keeping with the observation of Thille that a diagnosis of active cancer is independently associated with NIV failure . In our study, in 48% of immunocompromised patients initially treated with NIV, NIV failed, and they had a significantly worse mortality than patients successfully managed with NIV, as previously reported by Bellani et al. . Less expected was the finding that mortality of NIV failure patients was not different from that of the patients managed ab initio with IMV. However, two factors may limit the relevance of this observation: the relatively low number of patients in the NIV failure subgroup and the lack of information on the actual duration (i.e., in hours rather than days) of the NIV period before intubation, which would be important to know in the light of literature data showing that delaying endotracheal intubation after a prolonged NIV trial may negatively impact patient survival [19, 20]. In line with our data, Demoule et al. recently observed a progressive reduction of the impact of NIV failure on mortality in a large population of AHRF patients also including immunocompromised subjects . Taken together, these data probably suggest that better patient selection, earlier recognition of failure, and improvement in ventilation techniques may have contributed to limit the impact of NIV failure on mortality in recent years.
The present study has several limitations. First, it is a post hoc analysis of a prospective multicenter observational trial, and unknown confounders associated with the subgroup analysis may bias the results. Although the data were prospectively collected from a high number of centers from 50 countries, different approaches to clinical decisions from different centers (e.g., decisions on withholding or withdrawing of life-sustaining measures) may have influenced the outcomes. Second, the criteria used to define the immunocompromised cohort were quite heterogeneous. It was impossible to stratify the patients according to the prognosis of baseline disease and to the severity of immune deficiency. Indeed, causes of immunosuppression, other than malignancies, were not specified in nearly 40% of the whole cohort of immunocompromised patients. Moreover, in patients with cancer, no information was available on the type of cancer, its staging, and the nature and timing of anticancer treatments. This lack of information, related to the LUNG SAFE original CRF, should be considered a major limitation because the outcome of immunocompromised patients is strictly dependent on the type of underlying diseases and associated therapeutic approach. All these factors may limit the generalizability of our findings. Third, to limit the burden on investigators, data were collected once daily only, and information on the actual hours of duration of ventilatory treatments was not available. This is particularly relevant for patients treated with NIV because the precise duration of NIV before the eventual intubation might be important to understand the impact of NIV failure on outcome . Fourth, no information were provided on the type of interface used for NIV, a factor that can affect the outcome of NIV . Moreover, patients treated with HFNC oxygen therapy were excluded from the LUNG SAFE study because they did not fulfill criteria for ARDS. Fifth, the LUNG SAFE study was conducted in a very large number of ICUs with different experience in the treatment of ARDS. This may be particularly relevant for immunocompromised patients, who may have better outcomes if treated in highly experienced, dedicated units .
Immunocompromised patients represent an important proportion of ARDS patients in the ICU. Compared with immunocompetent subjects, they had higher mortality, regardless of ARDS severity, and a higher frequency of limitation of life-sustaining measures. Nonetheless, nearly half of these patients survive to hospital discharge. They were more likely to receive NIV as the first ventilator strategy, and those who did not require invasive ventilation had a lower mortality. Mortality of immunocompromised patients who failed NIV was not different from that of patients treated ab initio with IMV. These data should be considered in light of the nonspecific criteria used to define the immunocompromised population and the potentially heterogeneous approaches to clinical decision making in the participating centers.
LUNG SAFE investigators and ESICM Trial Group email address: firstname.lastname@example.org
Study coordination: Guy M. Francois (European Society of Intensive Care Medicine, Brussels, Belgium).
Data revision and management: Francesca Rabboni (University of Milan-Bicocca, Monza, Italy), Fabiana Madotto (University of Milan-Bicocca, Monza, Italy), Sara Conti (University of Milan-Bicocca, Monza, Italy).
LUNG SAFE executive and steering committees: John G. Laffey, Giacomo Bellani, Tai Pham, Eddy Fan, Antonio Pesenti, Laurent Brochard, Andres Esteban, Luciano Gattinoni, Frank van Haren, Anders Larsson, Daniel F. McAuley, Marco Ranieri, Gordon Rubenfeld, B. Taylor Thompson, Hermann Wrigge, Arthur S. Slutsky.
Argentina: Fernando Rios
Australia/New Zealand: Frank Van Haren
Belgium: T. Sottiaux, P. Depuydt
Bolivia: Fredy S. Lora
Brazil: Luciano Cesar Azevedo
Canada: Eddy Fan
Chile: Guillermo Bugedo
China: Haibo Qiu
Colombia: Marcos Gonzalez
Costa Rica: Juan Silesky
Czech Republic: Vladimir Cerny
Denmark: Jonas Nielsen
Ecuador: Manuel Jibaja
France: Tài Pham
Germany: Hermann Wrigge
Greece: Dimitrios Matamis
Guatemala: Jorge Luis Ranero
India: Pravin Amin
Iran: S. M. Hashemian
Ireland: Kevin Clarkson
Italy: Giacomo Bellani
Japan: Kiyoyasu Kurahashi
Mexico: Asisclo Villagomez
Morocco: Amine Ali Zeggwagh
The Netherlands: Leo M. Heunks
Norway: Jon Henrik Laake
The Philippines: Jose Emmanuel Palo
Portugal: Antero do Vale Fernandes
Romania: Dorel Sandesc
Saudi Arabia: Yaasen Arabi
Serbia: Vesna Bumbasierevic
Spain: Nicolas Nin, Jose A. Lorente
Sweden: Anders Larsson
Switzerland: Lise Piquilloud
Tunisia: Fekri Abroug
United Kingdom: Daniel F. McAuley, Lia McNamee
Uruguay: Javier Hurtado
United States: Ed Bajwa
Venezuela: Gabriel Démpair
Site investigators by country:
Albania: University Medical Center of Tirana “Mother Theresa” (Tirana): Hektor Sula, Lordian Nunci; University Hospital Shefqet Ndroqi (Tirana): Alma Cani
Argentina: Clinica De Especialidades (Villa Maria): Alan Zazu; Hospital Dr. Julio C. Perrando (Resistencia): Christian Dellera, Carolina S. Insaurralde; Sanatorio Las Lomas (San Isidro, Buenos Aires): Risso V. Alejandro; Sanatorio De La Trinidad San Isidro (San Isidro): Julio Daldin, Mauricio Vinzio; Hospital Español De Mendoza (Godoy Cruz-Mendoza): Ruben O. Fernandez; Hospital Del Centenario (Rosario): Luis P. Cardonnet, Lisandro R. Bettini; San Antonio (Gualeguay [Entre Rios]): Mariano Carboni Bisso, Emilio M. Osman; Cemic (Buenos Aires): Mariano G. Setten, Pablo Lovazzano; Hospital Universitrario Austral (Pilar): Javier Alvarez, Veronica Villar; Hospital Por + Salud (Pami) Dr. Cesar Milstein (Buenos Aires): Norberto C. Pozo, Nicolas Grubissich; Sanatorio Anchorena (Buenos Aires): Gustavo A. Plotnikow, Daniela N. Vasquez; Sanatorio De La Trinidad Mitre (Buenos Aires): Santiago Ilutovich, Norberto Tiribelli; Hospital Luis Lagomaggiore (Mendoza): Ariel Chena, Carlos A Pellegrini; H.I.G.A. San Martín (La Plata): María G. Saenz, Elisa Estenssoro; Hospital Misericordia (Cordoba): Matias Brizuela, Hernan Gianinetto; Sanatorio Juncal (Temperley): Pablo E. Gomez, Valeria I. Cerrato; Hospital D. F. Santojanni (Buenos Aires): Marco G. Bezzi, Silvina A. Borello; Hospital Alejandro Posadas (Buenos Aires): Flavia A. Loiacono, Adriana M. Fernandez
Australia: St. Vincent’s Hospital, Sydney (Darlinghurst): Serena Knowles, Claire Reynolds; St. George Public Hospital (Kogarah): Deborah M. Inskip, Jennene J. Miller; Westmead Hospital (Westmead): Jing Kong, Christina Whitehead; Flinders Medical Centre (Bedford Park, South Australia): Shailesh Bihari; John Hunter Hospital (Newcastle): Aylin Seven, Amanda Krstevski; Canberra Hospital (Garran): Helen J. Rodgers, Rebecca T. Millar; Calvary Mater Newcastle (Waratah): Toni E. Mckenna, Irene M. Bailey; Cabrini Hospital (Melbourne): Gabrielle C. Hanlon; Liverpool Hospital (Liverpool): Anders Aneman, Joan M. Lynch; Coffs Harbour Health Campus (Coffs Harbour): Raman Azad, John Neal; Sir Charles Gairdner Hospital (Nedlands): Paul W. Woods, Brigit L. Roberts; Concord Hospital (Concord): Mark R. Kol, Helen S. Wong
Austria: General Hospital of Vienna/Medical University of Vienna (Vienna): Katharina C. Riss, Thomas Staudinger
Belgium: Cliniques universitaires St-Luc, Université Catholique de Louvain (UCL) (Brussels): Xavier Wittebole, Caroline Berghe; CHU Dinant-Godinne (Yvoir): Pierre A. Bulpa, Alain M. Dive; AZ Sint-Augustinus Veurne (Veurne): Rik Verstraete, Herve Lebbinck; Ghent University Hospital (Ghent): Pieter Depuydt, Joris Vermassen; University Hospitals Leuven (Leuven): Philippe Meersseman, Helga Ceunen
Brazil: Hospital Renascentista (Pouso Alegre): Jonas I. Rosa, Daniel O. Beraldo; Vitoria Apart Hospital (Serra): Claudio Piras, Adenilton M. Rampinelli; Hospital Das Clinicas (São Paulo): Antonio P. Nassar Jr.; Hospital Geral do Grajaù (São Paulo): Sergio Mataloun, Marcelo Moock; Evangelical Hospital (Cachoeiro De Itapemirim/Espírito Santo): Marlus M. Thompson, Claudio H. Gonçalves; Hospital Moinhos De Vento (Porto Alegre): Ana Carolina P. Antônio, Aline Ascoli; Hospital Alvorada Taguatinga (Taguatinga): Rodrigo S. Biondi, Danielle C. Fontenele; Complexo Hospitalar Mngabeira Tarcisio Burity (Joao Pessoa): Danielle Nobrega, Vanessa M. Sales
Brunei Darussalam: Raja Isteri Pengiran Anak Saleha (Ripas) Hospital (Bandar Seri Begawan): Dr. Suresh Shindhe, Dr. Dayangku Hajah Maizatul Aiman binti Pengiran Haji Ismail
Canada: Medical-Surgical ICU of St. Michael’s Hospital (Toronto): John Laffey, Francois Beloncle; St. Joseph’s Health Centre (Toronto): Kyle G. Davies, Rob Cirone; Sunnybrook Health Sciences Center (Toronto): Venika Manoharan, Mehvish Ismail; Toronto Western Hospital (Toronto): Ewan C. Goligher, Mandeep Jassal; Medical Surgical ICU of the Toronto General Hospital (Toronto): Erin Nishikawa, Areej Javeed; Cardiovascular ICU of St. Michael’s Hospital (Toronto): Gerard Curley, Nuttapol Rittayamai; Cardiovascular ICU of the Toronto General Hospital (Toronto): Matteo Parotto, Niall D. Ferguson; Mount Sinai Hospital (Toronto): Sangeeta Mehta, Jenny Knoll; Trauma-Neuro ICU of St. Michael’s Hospital (Toronto): Antoine Pronovost, Sergio Canestrini
Chile: Hospital Clínico Pontificia Universidad Católica De Chile (Santiago): Alejandro R. Bruhn, Patricio H. Garcia; Hospital Militar De Santiago (Santiago): Felipe A. Aliaga, Pamela A. Farías; Clinica Davila (Santiago): Jacob S. Yumha; Hospital Guillermo Grant Benavente (Concepcion): Claudia A. Ortiz, Javier E. Salas; Clinica Las Lilas (Santiago): Alejandro A. Saez, Luis D. Vega; Hospital Naval Almirante Nef (Viña Del Mar): Eduardo F. Labarca, Felipe T. Martinez; Hospital Luis Tisné Brousse (Penanolen): Nicolás G. Carreño, Pilar Lora
China: The Second Affiliated Hospital of Harbin Medical University (Harbin): Haitao Liu; Nanjing Zhong-Da Hospital, Southeast University (Nanjing): Haibo Qiu, Ling Liu; The First Affiliated Hospital of Anhui Medical University (Hefei): Rui/Tang, Xiaoming Luo; Peking University People’s Hospital (Beijing): Youzhong An, Huiying Zhao; Fourth Affiliated Hospital of Harbin Medical University (Harbin): Yan Gao, Zhe Zhai; Nanjing Jiangbei People’s Hospital Affiliated to Medical School of Southeast University (Nanjing): Zheng L. Ye, Wei Wang; The First Affiliated Hospital of Dalian Medical Unvercity (Dalian): Wenwen Li, Qingdong Li; Subei People’s Hospital of Jiangsu Province (Yanghzou): Ruiqiang Zheng; Jinling Hospital (Nanjing): Wenkui Yu, Juanhong Shen; Urumqi General Hospital (Urumqi): Xinyu Li; Intensive Care Unit, First Affiliated Hospital of Wannan Medical College, Yijishan Hospital (Wuhu): Tao Yu, Weihua Lu; Sichuan Provincial People’s Hospital (Chengdu): Ya Q. Wu, Xiao B. Huang; Hainan Province People’s Hospital (Haikou): Zhenyang He; People’s Hospital of Jiangxi Province (Nanchang): Yuanhua Lu; Qilu Hospital of Shandong University (Jinan): Hui Han, Fan Zhang; Zhejiang Provincial People’s Hospital (Hangzhou): Renhua Sun; The First Affiliated Hospital of Bengbu Medical College (Bengbu, Anhui): Hua X. Wang, Shu H. Qin; Nanjing Municipal Government Hospital (Nanjing): Bao H. Zhu, Jun Zhao; The First Hospital of Lanzhou University (Lanzhou): Jian Liu, Bin Li; The First Affiliated Hospital of Chongqing University of Medical Science (Chongqing): Jing L. Liu, Fa C. Zhou; Xuzhou Central Hospital, Jiangsu Province, China (Xuzhou): Qiong J. Li, Xing Y. Zhang; The First People’s Hospital of Foshan (Foshan): Zhou Li-Xin, Qiang Xin-Hua; The First Affiliated Hospital of Guangxi Medical University (Nanning): Liangyan Jiang; Renji Hospital, Shanghai Jiao Tong University School of Medicine (Shanghai): Yuan N. Gao, Xian Y. Zhao; First Hospital of Shanxi Medical University (Taiyuan): Yuan Y. Li, Xiao L. Li; Shandong Provincial Hospital (Jinan): Chunting Wang, Qingchun Yao; Fujian Provincial Hospital (Fuzhou): Rongguo Yu, Kai Chen; Henan Provincial People’s Hospital (Zhengzhou): Huanzhang Shao, Bingyu Qin; The Second Affiliated Hospital of Kunming Medical University (Kunming City): Qing Q. Huang, Wei H. Zhu; Xiangya Hospital, Central South University (Changsha): Ai Y. Hang, Ma X. Hua; The First Affiliated Hospital of Guangzhou Medical University (Guangzhou): Yimin Li, Yonghao Xu; People’s Hospital of Hebei Province (Shijiazhuang): Yu D. Di, Long L. Ling; Guangdong General Hospital (Guangzhou): Tie H. Qin, Shou H. Wang; Beijing Tongren Hospital (Beijing): Junping Qin; Jiangsu Province Hospital (Nanjing): Yi Han, Suming Zhou
Colombia: Fundación Valle Del Lili (Cali): Monica P. Vargas
Costa Rica: Hospital San Juan De Dios (San José): Juan I. Silesky Jimenez, Manuel A. González Rojas, Jaime E. Solis-Quesada, Christian M. Ramirez-Alfaro
Czech Republic: University Hospital of Ostrava (Ostrava): Jan Máca, Peter Sklienka
Denmark: Aarhus Universitetshospital (Aarhus N): Jakob Gjedsted, Aage Christiansen; Rigshopitalet: Jonas Nielsen
Ecuador: Hospital Militar (Quito): Boris G. Villamagua, Miguel Llano
France: Clinique du Millenaire (Montpellier): Philippe Burtin, Gautier Buzancais; Centre Hospitalier (Roanne): Pascal Beuret, Nicolas Pelletier; CHU d’Angers (Angers): Satar Mortaza, Alain Mercat; Hôpital Marc Jacquet (Melun): Jonathan Chelly, Sébastien Jochmans; CHU Caen (Caen): Nicolas Terzi, Cédric Daubin; Henri Mondor Hospital (Créteil): Guillaume Carteaux, Nicolas de Prost; Cochin Hospital (Paris): Jean-Daniel Chiche, Fabrice Daviaud; Hôpital Tenon (Paris): Tai Pham, Muriel Fartoukh; CH Mulhouse-Emile Muller (Mulhouse): Guillaume Barberet, Jerome Biehler; Archet 1 University Hospital (Nice): Jean Dellamonica, Denis Doyen; Hopital Sainte Musse (Toulon): Jean-Michel Arnal, Anais Briquet; Hopital Nord - Réanimation des Détresses Respiratoires et Infections Sévères (Marseille): Sami Hraiech, Laurent Papazian; HEGP (Paris): Arnaud Follin; Louis Mourier Hospital (Colombes): Damien Roux, Jonathan Messika; Centre Hospitalier de Dax (Dax): Evangelos Kalaitzis; Réanimation Médicale, GH Pitié- Salpêtrière (Paris): Laurence Dangers, Alain Combes; AP-HP Ambroise Paré (Boulogne- Billancourt): Siu-Ming Au; University Hospital Rouen (Rouen): Gaetan Béduneau, Dorothée Carpentier; CHU Amiens (Amiens-Salouel): Elie H. Zogheib, Herve Dupont; Centre Hospitalier Intercommunal Robert Ballanger (Aulnay Sous Bois): Sylvie Ricome, Francesco L. Santoli; Centre Hospitalier René Dubos (Pontoise): Sebastien L. Besset; CHI Portes de l’Oise (Beaumont Sur Oise): Philippe Michel, Bruno Gelée; Archet 2 University Hospital (Nice): Pierre-Eric Danin, Bernard Goubaux; Centre Hospitalier Pierre Oudot (Bourgoin Jallieu): Philippe J. Crova, Nga T. Phan; CH Dunkerque (Dunkerque): Frantz Berkelmans; Centre Hospitalier de Belfort Montbéliard (Belfort): Julio C. Badie, Romain Tapponnier; Centre Hospitalier Emile Muller (Mulhouse): Josette Gally, Samy Khebbeb; Hôpital de Hautepierre-Hôpitaux Universitaires de Strasbourg (Strasbourg): Jean-Etienne Herbrecht, Francis Schneider; Centre Hospitalier de Dieppe (Dieppe): Pierre-Louis M Declercq, Jean-Philippe Rigaud; Bicetre (Le Kremin-Bicetre): Jacques Duranteau, Anatole Harrois; CHU Gabriel Montpied (Clermont-Ferrand): Russell Chabanne, Julien Marin; CHU Estaing (Clermont-Ferrand): Charlene Bigot, Sandrine Thibault; CHI Eure-Seine Evreux (Evreux): Mohammed Ghazi, Messabi Boukhazna; Centre Hospitalier d Châlons en Champagne (Châlons en Champagne): Salem Ould Zein; CH Beauvais (Beauvais): Jack R. Richecoeur, Daniele M. Combaux; Centre Hospitalier Le Mans (Le Mans): Fabien Grelon, Charlene Le Moal; Hôpital Fleyriat (Bourg en Bresse): Elise P. Sauvadet, Adrien Robine; Hôpital Saint Louis (Paris): Virginie Lemiale, Danielle Reuter; Service de Pneumologie Pitié-Salpétrière (Paris): Martin Dres, Alexandre Demoule; Centre Hospitalier Gonesse (Gonesse): Dany Goldgran-Toledano; Hôpital Croix Rousse (Lyon): Loredana Baboi, Claude Guérin
Germany: St. Nikolaus-Stiftshospital (Andernach): Ralph Lohner; Fachkrankenhaus Coswig GmbH (Coswig): Jens Kraßler, Susanne Schäfer; University Hospital Frankfurt (Frankfurt am Main): Kai D. Zacharowski, Patrick Meybohm; Department of Anaesthesia & Intensive Care Medicine, University Hospital of Leipzig (Leipzig): Andreas W. Reske, Philipp Simon; Asklepios Klinik Langen (Langen): Hans-Bernd F Hopf, Michael Schuetz; Städtisches Krankenhaus Heinsberg (Heinsberg): Thomas Baltus
Greece: Hippokrateion General Hospital of Athens (Athens): Metaxia N. Papanikolaou, Theonymfi G. Papavasilopoulou; University General Hospital of Thessaloniki AHEPA (Thessaloniki): Giannis A. Zacharas, Vasilis Ourailogloy; Hippokration General Hospital of Thessaloniki (Thessaloniki): Eleni K. Mouloudi, Eleni V. Massa; Hospital General of Kavala (Kavala): Eva O. Nagy, Electra E. Stamou; Papageorgiou General Hospital (Thessaloniki): Ellada V. Kiourtzieva, Marina A. Oikonomou
Guatemala: Hospital General De Enfermedades, Instituto Guatemalteco De Seguridad Social (Ciudad De Guatemala): Luis E. Avila; Centro Médico Militar (Guatemala): Cesar A. Cortez, Johanna E. Citalán
India: Deenanath Mangeshkar Hospital and Research Center (Pune): Sameer A. Jog, Safal D. Sable; Care Institute of Medical Sciences (CIMS) Hospital (Ahmedabad): Bhagyesh Shah; Sanjay Gandhi Postgraduate Institute of Medical Sciences (SGPGIMS) (Lucknow): Mohan Gurjar, Arvind K. Baronia; Rajasthan Hospital (Ahmedabad): Mohammedfaruk Memon; National Institute of Mental Health and Neuro Sciences (NIMHANS) (Bangalore): Radhakrishnan Muthuchellappan, Venkatapura J. Ramesh; Anaesthesiology Unit of the Kasturba Medical College & Department of Respiratory Therapy, SHOAS, Manipal University (Manipal): Anitha Shenoy, Ramesh Unnikrishnan; Sanjeevan Hospital (Pune): Subhal B. Dixit, Rachana V. Rhayakar; Apollo Hospitals (Chennai): Nagarajan Ramakrishnan, Vallish K. Bhardwaj; Medicine Unit of the Kasturba Medical College and Department of Respiratory Therapy, SHOAS, Manipal University (Manipal): Heera L. Mahto, Sudha V. Sagar; G. Kuppuswamy Naidu Memorial Hospital (Coimbatore): Vijayanand Palaniswamy, Deeban Ganesan
Iran: NRITLD/Masih Daneshvari (Tehran): Seyed Mohammadreza Hashemian, Hamidreza Jamaati; Milad Hospital (Tehran): Farshad Heidari
Ireland: St. Vincent’s University Hospital (Dublin): Edel A. Meaney, Alistair Nichol; Mercy University Hospital (Cork): Karl M. Knapman, Donall O’Croinin; Cork University Hospital (Cork): Eimhin S. Dunne, Dorothy M. Breen; Galway University Hospital (Galway): Kevin P. Clarkson, Rola F. Jaafar; Beaumont Hospital (Dublin): Rory Dwyer, Fahd Amir; Mater Misericordiae University Hospital (Dublin): Olaitan O. Ajetunmobi, Aogan C. O’Muircheartaigh; Tallaght Hospital (Dublin): Colin S. Black, Nuala Treanor; St. James’s Hospital (Dublin): Daniel V. Collins, Wahid Altaf
Italy: Santa Maria delle Croci Hospital (Ravenna): Gianluca Zani, Maurizio Fusari; Arcispedale Sant’Anna Ferrara (Ferrara): Savino Spadaro, Carlo A. Volta; Ospedale Profili (Fabriano [An]): Romano Graziani, Barbara Brunettini; Umberto I Nocera Inferiore (Nocera Inferiore Salerno): Salvatore Palmese; Azienda Ospedaliera San Paolo – Polo Universitario, Università degli Studi di Milano (Milan): Paolo Formenti, Michele Umbrello; Sant’Anna (San Fermo Della Battaglia [Co]): Andrea Lombardo; Spedali Civili Brescia (Brescia): Elisabetta Pecci, Marco Botteri; Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico (Milan): Monica Savioli, Alessandro Protti; University Campus Bio-Medico of Rome (Rome): Alessia Mattei, Lorenzo Schiavoni; Azienda Ospedaliera “Mellino Mellini” (Chiari [Bs]): Andrea Tinnirello, Manuel Todeschini; Policlinico P. Giaccone, University of Palermo (Palermo): Antonino Giarratano, Andrea Cortegiani; Niguarda Cà Granda Hospital (Milan): Sara Sher, Anna Rossi; A.Gemelli University Hospital (Rome): Massimo M. Antonelli, Luca M. Montini; Ospedale “Sandro Pertini” (Rome): Paolo Casalena, Sergio Scafetti; ISMeTT IRCCS UPMC (Palermo): Giovanna Panarello, Giovanna Occhipinti; Ospedale San Gerardo (Monza): Nicolò Patroniti, Matteo Pozzi; Santa Maria Della Scaletta (Imola): Roberto R. Biscione, Michela M. Poli; Humanitas Research Hospital (Rozzano): Ferdinando Raimondi, Daniela Albiero; Ospedale Desio Azienda Ospedaliera Desio-Vimercate (Desio): Giulia Crapelli, Eduardo Beck; Pinetagrande Private Hospital (Castelvolturno): Vincenzo Pota, Vincenzo Schiavone; IRCCS Azienda Ospedaliera Universitaria San Martino - IST (Genova): Alexandre Molin, Fabio Tarantino; Ospedale San Raffaele (Milano): Giacomo Monti, Elena Frati; Ospedali Riuniti Di Foggia (Foggia): Lucia Mirabella, Gilda Cinnella; Azienda Ospedaliera Luigi Sacco - Polo Universitario (Milano): Tommaso Fossali, Riccardo Colombo; A.O.U. Città della Salute e della Scienza di Torino (Turin): Pierpaolo Terragni Ilaria Pattarino; Università degli Studi di Pavia - Fondazione IRCCS Policlinico San Matteo (Pavia): Francesco Mojoli, Antonio Braschi; Azienda Ospedaliera Ospedale Civile Legnano (Legnano): Erika E. Borotto; Arnas Ospedale Civico Di Cristina Benfratelli (Palermo): Andrea N. Cracchiolo, Daniela M. Palma; Azienda Ospedaliera Della Provincia Di Lecco - Ospedale “A. Manzoni” (Lecco): Francesco Raponi, Giuseppe Foti; A.O. Provincia Di Lecco - Ospedale Alessandro Manzoni (Lecco): Ettore R. Vascotto, Andrea Coppadoro; Cliniche Universitarie Sassari (Sassari): Luca Brazzi, Leda Floris; IRCCS Policlinico San Matteo (Pavia): Giorgio A. Iotti, Aaron Venti
Japan: Yokohama City University Hospital (Yokohama): Osamu Yamaguchi, Shunsuke Takagi; Toyooka Hospital (Toyooka City, Hyogo Prefecture): Hiroki N. Maeyama; Chiba University Hospital (Chiba City): Eizo Watanabe, Yoshihiro Yamaji; Okayma University Hospital (Okayama): Kazuyoshi Shimizu, Kyoko Shiozaki; Japanese Foundation for Cancer Research, Cancer Institute Hospital, Department of Emergency Medicine and Critical Care (Tokyo): Satoru Futami; Ibaraki Prefectural Central Hospital (Kasama): Sekine Ryosuke; Tohoku University Hospital (Sendai-Shi): Koji Saito, Yoshinobu Kameyama; Tokyo Medical University Hachioji Medical Center (Hachioji, Tokyo): Keiko Ueno; Tokushima University Hospital (Tokushima): Masayo Izawa, Nao Okuda; Maebashi Red Cross Hospital (Gunma Maebashi): Hiroyuki Suzuki, Tomofumi Harasawa; Urasoe General Hospital (Urasoe): Michitaka Nasu, Tadaaki Takada; Ohta General Hospital Foundation Ohta Nishinouchi Hospital (Fukushima): Fumihito Ito; Jichi Medical University Hospital (Shimotsuke): Shin Nunomiya, Kansuke Koyama; Mito Kyodo General Hospital, Tsukuba University Hospital Mito Medical Center (Mito): Toshikazu Abe; Sendai City Hospital (Sendai): Kohkichi Andoh, Kohei Kusumoto; Ja Hiroshima General Hospital (Hatsukaichi City, Hiroshima): Akira Hirata, Akihiro Takaba; Yokohama Rosai Hospital (Yokohama): Hiroyasu Kimura; Nagasaki University Hospital (Nagasaki): Shuhei Matsumoto, Ushio Higashijima; Niigata University Medical & Dental Hospital (Niigata): Hiroyuki Honda, Nobumasa Aoki; Mie University Hospital (Tsu, Mie): Hiroshi Imai; Yamaguchi University Hospital (Ube, Yamaguchi): Yasuaki Ogino, Ichiko Mizuguchi; Saiseikai Kumamoto Hospital (Kumamoto City): Kazuya Ichikado; Shinshu University School of Medecine (Matsumoto City): Kenichi Nitta, Katsunori Mochizuki; Kuki General Hospital (Kuki): Tomoaki Hashida; Kyoto Medical Center (Kyoto): Hiroyuki Tanaka; Fujita Health University (Toyoake): Tomoyuki Nakamura, Daisuke Niimi; Rakwakai Marutamachi Hospital (Kyoto): Takeshi Ueda; Osaka University Hospital (Suita City, Osaka Prefecture): Yozo Kashiwa, Akinori Uchiyama
Latvia: Paul Stradins Clinical University Hospital (Riga): Olegs Sabelnikovs, Peteris Oss
Lebanon: Kortbawi Hospital (Jounieh): Youssef Haddad
Malaysia: Hospital Kapit (Kapit): Kong Y. Liew
Mexico: Instituto Nacional De Cancerología, México (Mexico City): Silvio A. Ñamendys-Silva, Yves D. Jarquin-Badiola; Hospital De Especialidades “Antonio Fraga Mouret” Centro Medico Nacional La Raza IMSS (Mexico City): Luis A. Sanchez-Hurtado, Saira S. Gomez-Flores; Hospital Regional 1° De Octubre (Mexico City): Maria C. Marin, Asisclo J. Villagomez; Hospital General Dr. Manuel Gea Gonzalez (Mexico City): Jordana S. Lemus, Jonathan M. Fierro; Hospital General De Zona No. 1 Instituto Mexicano Del Seguro Social Tepic Nayarit (Tepic): Mavy Ramirez Cervantes, Francisco Javier Flores Mejia; Centro Medico Dalinde (Mexico D.F.): Dulce Dector, Dulce M. Dector; OPD Hospital Civil De Guadalajara Hospital Juan I. Menchaca (Guadalajara): Daniel R. Gonzalez, Claudia R. Estrella; Hospital Regional De Ciudad Madero Pemex (Ciudad Madero): Jorge R. Sanchez- Medina, Alvaro Ramirez-Gutierrez; Centro Médico ABC (Mexico D.F.): Fernando G. George, Janet S. Aguirre; Hospital Juarez De Mexico (Mexico City): Juan A. Buensuseso, Manuel Poblano
Morocco: Mohammed V University, University Teaching Ibn Sina Hospital (Rabat): Tarek Dendane, Amine Ali Zeggwagh; Hopital Militaire D’Instruction Mohammed V (Rabat): Hicham Balkhi; Errazi (Marrakech): Mina Elkhayari, Nacer Samkaoui; University Teaching Hospital Ibn Rushd (Casablanca): Hanane Ezzouine, Abdellatif Benslama; Hôpital des Spécialités de Rabat (HSR) (Rabat): Mourad Amor, Wajdi Maazouzi
The Netherlands: Tjongerschans (Heerenveen): Nedim Cimic, Oliver Beck; CWZ (Nijmegen): Monique M. Bruns, Jeroen A. Schouten; Rijnstate Hospital (Arnhem): Myra - Rinia, Monique Raaijmakers; Radboud UMC (Nijmegen): Leo M. Heunks, Hellen M. Van Wezel; Maastricht University Medical Centre (Maastricht): Serge J. Heines, Ulrich Strauch; Catharinaziekenhuis (Eindhoven): Marc P. Buise; Academic Medical Center (Amsterdam): Fabienne D. Simonis, Marcus J. Schultz
New Zealand: Tauranga Hospital (Tauranga): Jennifer C. Goodson, Troy S. Browne; Wellington Hospital (Wellington): Leanlove Navarra, Anna Hunt; Dunedin Hospital (Dunedin): Robyn A. Hutchison, Mathew B. Bailey; Auckland City Hospital (Auckland): Lynette Newby, Colin Mcarthur; Whangarei Base Hospital (Whangarei): Michael Kalkoff, Alex Mcleod; North Shore Hospital (Auckland): Jonathan Casement, Danielle J. Hacking
Norway: Ålesund Hospital (Ålesund): Finn H. Andersen, Merete S. Dolva; Oslo University Hospital Rikshospitalet Medical Centre (Oslo): Jon H. Laake, Andreas Barratt-Due; Stavanger University Hospital (Stavanger): Kim Andre L. Noremark, Eldar Søreide; Haukeland University Hospital (Bergen): Brit Å. Sjøbø, Anne B. Guttormsen
Peru: Hospital Nacional Edgardo Rebagliati Martins (Lima): Hector H. Leon Yoshido; Clínica Ricardo Palma (Lima): Ronald Zumaran Aguilar, Fredy A. Montes Oscanoa
The Philippines: The Medical City (Pasig): Alain U. Alisasis, Joanne B. Robles; Chong Hua Hospital (Cebu): Rossini Abbie B. Pasanting-Lim, Beatriz C. Tan
Poland: Warsaw University Hospital (Warsaw): Pawel Andruszkiewicz, Karina Jakubowska
Portugal: Centro Hospitalar da Cova da Beira (Covilhã): Cristina M. Coxo; Hospital Santa Maria, Centro Hospitalar Lisboa Norte (Lisboa): António M. Alvarez, Bruno S. Oliveira; Centro Hospitalar Trás-os-Montes e Alto Douro - Hospital de S. Pedro - Vila Real (Vila Real): Gustavo M. Montanha, Nelson C. Barros; Hospital Beatriz Ângelo (Loures): Carlos S. Pereira, António M. Messias; Hospital de Santa Maria (Lisboa): Jorge M. Monteiro; Centro Hospitalar Médio Tejo - Hospital De Abrantes (Abrantes): Ana M. Araujo, Nuno T. Catorze; Instituto Português de Oncologia de Lisboa (Lisboa): Susan M. Marum, Maria J. Bouw; Hospital Garcia De Orta (Almada): Rui M. Gomes, Vania A. Brito; Centro Hospitalar do Algarve (Faro): Silvia Castro, Joana M. Estilita; HPP Hospital De Cascais (Alcabideche): Filipa M. Barros; Hospital Prof. Doutor Fernando Fonseca Epe (Amadora): Isabel M. Serra, Aurelia.
Romania: Fundeni Clinical Institute (Bucharest): Dana R. Tomescu, Alexandra Marcu; Emergency Clinical County Hospital Timisoara (Timisoara): Ovidiu H. Bedreag, Marius Papurica; Elias University Emergency Hospital (Bucharest): Dan E. Corneci, Silvius Ioan Negoita
Russian Federation: University Hospital (Kemerovo): Evgeny Grigoriev; Krasnoyarsk Regional Hospital, Krasnoyarsk State Medical University (Krasnoyarsk): Alexey I. Gritsan, Andrey A. Gazenkampf
Saudi Arabia: GICU of PSMMC (Riyadh): Ghaleb Almekhlafi, Mohamad M. Albarrak; SICU of PSMMC (Riyadh): Ghanem M. Mustafa; King Faisal Hospital and Research Center (Riyadh): Khalid A. Maghrabi, Nawal Salahuddin; King Fahad Hospital (Baha): Tharwat M. Aisa; King Abdulaziz Medical City (Riyadh): Ahmed S. Al Jabbary, Edgardo Tabhan; King Abdulaziz Medical City (Riyadh): Yaseen M. Arabi; King Abdulaziz Medical City (Riyadh): Yaseen M. Arabi, Olivia A. Trinidad; King Abdulaziz Medical City (Riyadh): Hasan M. Al Dorzi, Edgardo E. Tabhan
South Africa: Charlotte Maxeke Johannesburg Academic Hospital (Johannesburg): Stefan Bolon, Oliver Smith
Spain: Hospital Sant Pau (Barcelona): Jordi Mancebo, Hernan Aguirre-Bermeo; Hospital Universitari Bellvitge (L’Hospitalet de Llobregat (Barcelona)): Juan C. Lopez-Delgado, Francisco Esteve; Hospital Son Llatzer (Palma de Mallorca): Gemma Rialp, Catalina Forteza; Sabadell Hospital, CIBER Enfermedades Respiratorias (Sabadell): Candelaria de Haro, Antonio Artigas; Hospital Universitario Central de Asturias (Oviedo): Guillermo M. Albaiceta, Sara de Cima- Iglesias; Complejo Hospitalario Universitario de A Coruña (A Coruña): Leticia Seoane-Quiroga, Alexandra Ceniceros-Barros; Hospital Universitario Miguel Servet (Zaragoza): Antonio L. Ruiz- Aguilar, Luis M. Claraco-Vega; Morales Meseguer University Hospital (Murcia): Juan Alfonso Soler, Maria del Carmen Lorente; Hospital Universitario del Henares (Coslada): Cecilia Hermosa, Federico Gordo; Complejo Asistencial de Palencia. Hospital Rio Carrión (Palencia): Miryam Prieto-González, Juan B. López-Messa; Fundación Jiménez Díaz (Madrid): Manuel P. Perez, Cesar P. Perez; Hospital Clínico Universitario Lozano Blesa (Zaragoza): Raquel Montoiro Allue; Hospital Verge de la Cinta (Tortosa): Ferran Roche-Campo, Marco Ibañez-Santacruz; Hospital Universitario 12 de Octubre (Madrid): Susana Temprano; Hospital Universitario Príncipe de Asturias (Alcalá de Henares, Madrid): Maria C. Pintado, Raul de Pablo; Hospital Universitari Germans Trias i Pujol (Badalona): Pilar Ricart Aroa Gómez; Hospital Universitario Arnau de Vilanova de Lleida (Lleida): Silvia Rodriguez Ruiz, Silvia Iglesias Moles; Consorci Sanitari de Terrassa - Hospital de Terrassa (Barcelona): Maria Teresa Jurado, Alfons Arizmendi; Hospital Universitari Mútua Terrassa (Terrassa): Enrique A. Piacentini; Hospital Universitario de Móstoles (Mostoles): Nieves Franco, Teresa Honrubia; Complejo Asistencial de Salamanca (Salamanca): Meisy Perez Cheng, Elena Perez Losada; Hospital General Universitario de Ciudad Real (Ciudad Real): Javier Blanco, Luis J. Yuste; Torrecardenas (Almeria): Cecilia Carbayo-Gorriz, Francisca G. Cazorla-Barranquero; Hospital Universitario Donostia (San Sebastian): Javier G. Alonso, Rosa S. Alda; Hospital Universitario de Torrejón (Madrid): Ángela Algaba, Gonzalo Navarro; Hospital Universitario de La Princesa (Madrid): Enrique Cereijo, Esther Diaz-Rodriguez; Hospital Universitario Lucus Augusti (Lugo): Diego Pastor Marcos, Laura Alvarez Montero; Hospital Universitario Santa Lucia (Cartagena): Luis Herrera Para, Roberto Jimenez Sanchez; Hospital Universitario Severo Ochoa, Leganes (Madrid): Miguel Angel Blasco Navalpotro, Ricardo Diaz Abad; University Hospital of Nuestra Señora de Candelaria (Santa Cruz de Tenerife): Raquel Montiel González, Dácil Parrilla Toribio; Hospital Universitario Marques de Valdecilla (Santander): Alejandro G. Castro, Maria Jose D. Artiga; Hospital Infanta Cristina (Parla, Madrid): Oscar Penuelas; Hospital General de Catalunya (Sant Cugat Del Valles): Tomas P. Roser, Moreno F. Olga; San Pedro de Alcántara (Cáceres): Elena Gallego Curto, Rocío Manzano Sánchez; Sant Joan de Reus (Reus): Vallverdu P. Imma, Garcia M. Elisabet; Hospital Joan XXIII (Tarragona): Laura Claverias, Monica Magret; Hospital Universitario de Getafe (Madrid): Ana M. Pellicer, Lucia L. Rodriguez; Hospital Universitario Río Hortega (Valladolid): Jesús Sánchez-Ballesteros, Ángela González-Salamanca; Hospital Arquitecto Marcide (Ferrol, A Coruña): Antonio G. Jimenez, Francisco P. Huerta; Hospital General Universitario Gregorio Marañón (Madrid): Juan Carlos J. Sotillo Diaz, Esther Bermejo Lopez; Hospital General de Segovia (Segovia): David D. Llinares Moya, Alec A. Tallet Alfonso; Hospital General Universitario Reina Sofia (Murcia): Palazon Sanchez Eugenio Luis, Palazon Sanchez Cesar; Complejo Hospitalario Universitario de Albacete (Albacete): Sánchez I. Rafael, Corcoles G. Virgilio; Hospital Infanta Elena (Valdemoro): Noelia N. Recio
Sweden: Sahlgrenska University Hospital (Gothenburg): Richard O. Adamsson, Christian C. Rylander; Karolinska University Hospital (Stockholm): Bernhard Holzgraefe, Lars M. Broman; Akademiska Sjukhuset Uppsala (Uppsala): Joanna Wessbergh, Linnea Persson; Vrinnevisjukhuset (Norrköping): Fredrik Schiöler, Hans Kedelv; Linkoping University Hospital (Linköping): Anna Oscarsson Tibblin, Henrik Appelberg; Skellefteå Lasarett (Skellefteå): Lars Hedlund, Johan Helleberg; Karolinska University Hospital Solna (Stockholm): Karin E. Eriksson, Rita Glietsch; Umeå University Hospital (Umeå): Niklas Larsson, Ingela Nygren; Danderyd Hospital (Stockholm): Silvia L. Nunes, Anna-Karin Morin; Lund University Hospital (Lund): Thomas Kander, Anne Adolfsson
Switzerland: CHUV (Centre hospitalier universitaire vaudois) (Lausanne): Lise Piquilloud; Hôpital neuchâtelois - La Chaux-de-Fonds (La Chaux-de-Fonds): Hervé O. Zender, Corinne Leemann-Refondini
Tunisia: Hopital Taher Sfar Mahdia (Mahdia): Souheil Elatrous; University Hospital Farhat Hached Sousse (Sousse): Slaheddine Bouchoucha, Imed Chouchene; CHU F. Bourguiba (Monastir): Islem Ouanes; Mongi Slim University Hospital, La Marsa (La Marsa): Asma Ben Souissi, Salma Kamoun
Turkey: Cerrahpasa Medical Faculty Emergency Intensive Care Unit (Istanbul): Oktay Demirkiran; Cerrahpasa Medical Faculty Sadi Sun Intensive Care Unit (Istanbul): Mustafa Aker, Emre Erbabacan; Uludag University Medical Faculty (Bursa): Ilkay Ceylan, Nermin Kelebek Girgin; Ankara University Faculty of Medicine, Reanimation, Level 3 ICU (Ankara): Menekse Ozcelik, Necmettin Ünal; Ankara University Faculty of Medicine, Level 2 ICU-Postoperative ICU (Ankara): Basak Ceyda Meco; Istanbul Kartal Eğitim ve Araştırma Hastanesi (Istanbul): Onat O. Akyol, Suleyman S. Derman
United Kingdom: Papworth Hospital (Cambridge): Barry Kennedy, Ken Parhar; Royal Glamorgan Hospital (Llantrisant): Latha Srinivasa; Royal Victoria Hospital-Belfast (Belfast): Lia McNamee, Danny McAuley; Jack Steinberg Critical Care Unit, King’s College London (London): Phil Hopkins, Clare Mellis; Frank Stansil Critical Care Unit, King’s College Hospital (London): Vivek Kakar; Liver ICU of King’s College London (London): Dan Hadfield; Christine Brown Critical Care Unit, King’s College London (London): Andre Vercueil; West Suffolk Hospital (Bury St. Edmunds): Kaushik Bhowmick, Sally K. Humphreys; Craigavon Area Hospital (Portadown): Andrew Ferguson, Raymond Mckee; Barts Health NHS Trust, Whipps Cross Hospital (Leytonstone): Ashok S. Raj, Danielle A. Fawkes; Kettering General Hospital, Foundation NHS Trust (Northamptonshire): Philip Watt, Linda Twohey; Barnet General Hospital (Barnet): Rajeev R. JhaMatthew Thomas, Alex Morton, Varsha Kadaba; Rotherham General Hospital (Rotherham): Mark J. Smith, Anil P. Hormis; City Hospital (Birmingham): Santhana G. Kannan, Miriam Namih; Poole Hospital NHS Foundation Trust (Poole): Henrik Reschreiter, Julie Camsooksai; Weston General Hospital (Weston-Super-Mare): Alek Kumar, Szabolcs Rugonfalvi; Antrim Area Hospital (Antrim): Christopher Nutt, Orla Oneill; Aintree University Hospital (Liverpool): Colette Seasman, Ged Dempsey; Northern General Hospital (Sheffield): Christopher J. Scott, Helen E. Ellis; John Radcliffe Hospital (Oxford): Stuart Mckechnie, Paula J. Hutton; St. George’s Hospital (London): Nora N. Di Tomasso, Michela N. Vitale; Hillingdon Hospital (Uxbridge): Ruth Griffin, Michael N. Dean; The Royal Bournemouth & Christchurch NHS Foundation Trust (Bournemouth, Dorset): Julius H. Cranshaw, Emma L. Willett; Severe Respiratory Failure Service, Guy’s and St. Thomas’ NHS Foundation Trust (London): Nicholas Ioannou; Whittington Hospital (London): Sarah Gillis; Wexham Park Hospital (Slough): Peter Csabi; Western General Hospital (Edinburgh): Rosaleen Macfadyen, Heidi Dawson; Royal Preston Hospital (Preston): Pieter D. Preez, Alexandra J. Williams; Brighton and Sussex University Hospitals NHS Trust (Brighton): Owen Boyd, Laura Ortiz-Ruiz de Gordoa; East and North Herts NHS Trust (Stevenage): Jon Bramall, Sophie Symmonds; Barnsley Hospital (Barnsley): Simon K. Chau, Tim Wenham; Prince Charles Hospital (Merthyr Tydfil): Tamas Szakmany, Piroska Toth-Tarsoly; University Hospital of South Manchester NHS Foundation Trust (Manchester): Katie H. Mccalman, Peter Alexander; Harrogate District Hospital (Harrogate): Lorraine Stephenson, Thomas Collyer; East and North Herts NHS Trust (Welwyn Garden City): Rhiannon Chapman, Raphael Cooper; Western Infirmary (Glasgow): Russell M. Allan, Malcolm Sim; Dumfries and Galloway Royal Infirmary (Dumfries): David W. Wrathall, Donald A. Irvine; Charing Cross Hospital (London): Kim S. Zantua, John C. Adams; Worcestershire Royal Hospital (Worcester): Andrew J. Burtenshaw, Gareth P. Sellors; Royal Liverpool University Hospital (Liverpool): Ingeborg D. Welters, Karen E. Williams; Royal Alexandra Hospital (Glasgow): Robert J. Hessell, Matthew G. Oldroyd; Morriston Hospital (Swansea): Ceri E. Battle, Suresh Pillai; Frimley Park Hospita (Frimley): Istvan - Kajtor, Mageswaran - Sivashanmugavel; Altnagelvin Hospital (Derry): Sinead C. Okane, Adrian Donnelly; Buckinghamshire Healthcare NHS Trust (High Wycombe, Buckinghamshire): Aniko D. Frigyik, Jon P. Careless; Milton Keynes Hospital (Milton Keynes): Martin M. May, Richard Stewart; Ulster Hospital (Belfast): T. John Trinder, Samantha J. Hagan; University Hospital of Wales (Cardiff): Matt P. Wise, Jade M. Cole; Freeman Hospital (Newcastle Upon Tyne): Caroline C. MacFie, Anna T. Dowling
Uruguay: Hospital Español (Montevideo): Javier Hurtado, Nicolás Nin; Cudam (Montevideo): Javier Hurtado; Sanatorio Mautone (Maldonado): Edgardo Nuñez; Sanatorio Americano (Montevideo): Gustavo Pittini, Ruben Rodriguez; Hospital de Clínicas (Montevideo): María C Imperio, Cristina Santos; Circulo Católico Obreros Uruguay - Sanatorio Juan Pablo II (Montevideo): Ana G. França, Alejandro Ebeid; CASMU (Montevideo): Alberto Deicas, Carolina Serra
United States: St. Louis University Hospital (St. Louis, MO): Aditya Uppalapati, Ghassan Kamel; Beth Israel Deaconess Medical Center (Boston, MA): Valerie M. Banner-Goodspeed, Jeremy R. Beitler; Memorial Medical Center (Springfield, IL): Satyanarayana Reddy Mukkera, Shreedhar Kulkarni; Massachusetts General Hospital (Boston, MA): Jarone Lee, Tomaz Mesar; University of Cincinnati Medical Center (Cincinnati, OH): John O Shinn Iii, Dina - Gomaa; Massachusetts General Hospital (Boston, MA): Christopher Tainter, Jarone Lee; Massachusetts General Hospital (Boston, MA): Tomaz Mesar, Jarone Lee; R. Adams Cowley Shock Trauma Center, University of Maryland Medical Center (Baltimore, MD): Dale J. Yeatts, Jessica Warren; Intermountain Medical Center (Murray, UT): Michael J. Lanspa, Russel R. Miller, Colin K. Grissom, Samuel M. Brown; Mayo Clinic (Rochester, MN): Philippe R. Bauer; North Shore Medical Center (Salem, MA): Ryan J. Gosselin, Barrett T. Kitch; Albany Medical Center (Albany, NY): Jason E. Cohen, Scott H. Beegle; John H. Stoger Hospital of Cook County (Chicago, IL): Renaud M. Gueret, Aiman Tulaimat; Albany Medical Center (Albany, NY); Shazia Choudry; University of Alabama at Birmingham (UAB) (Birmingham, AL): William Stigler, Hitesh Batra; Duke University Hospital (Durham, NC): Nidhi G. Huff; Iowa Methodist Medical Center (Des Moines, IA): Keith D. Lamb, Trevor W. Oetting; Surgical & Neurosciences Intensive Care Unit of the University of Iowa Hospitals and Clinics (Iowa City, IA): Nicholas M. Mohr, Claine Judy; Medical Center of Louisiana at New Orleans (New Orleans, LA): Shigeki Saito, Fayez M. Kheir; Tulane University (New Orleans, LA): Fayez Kheir; Critical Care Unit of the University of Iowa Hospitals and Clinics (Iowa City, IA): Adam B. Schlichting, Angela Delsing; University of California, San Diego Medical Center (San Diego, CA): Daniel R. Crouch, Mary Elmasri; UC San Diego Thornton Hospital (La Jolla, CA): Daniel R. Crouch, Dina Ismail; University Hospital (Cincinnati, OH): Kyle R. Dreyer, Thomas C. Blakeman; University Hospital (Cincinnati, OH): Kyle R. Dreyer, Dina Gomaa; Tower 3B Medical ICU of Brigham and Women’s Hospital (Boston, MA): Rebecca M. Baron, Carolina Quintana Grijalba; Tower 8C Burn/Trauma ICU of Brigham and Women’s Hospital (Boston, MA): Peter C. Hou; Tower 8D Surgical ICU of Brigham and Women’s Hospital (Boston, MA): Raghu Seethala; Tower 9C Neurosurgical ICU of Brigham and Women’s Hospital (Boston, MA): Imo Aisiku; Tower 9D Neurological ICU of Brigham and Women’s Hospital (Boston, MA): Galen Henderson; Tower 11C Thoracic ICU of Brigham and Women’s Hospital (Boston, MA): Gyorgy Frendl; Carl J. and Ruth Shapiro Cardiovascular Center, Brigham and Women’s Hospital (Boston, MA): Sen-Kuang Hou, Robert L. Owens, Ashley Schomer
Serbia: Clinical Center of Serbia (Belgrade): Vesna Bumbasirevic, Bojan Jovanovic; Military Medical Academy (Belgrade): Maja Surbatovic, Milic Veljovic
The authors received no funding for this study. However, the LUNG SAFE study was funded and supported by the European Society of Intensive Care Medicine (ESICM; Brussels, Belgium), St. Michael’s Hospital (Toronto, ON, Canada), and the University of Milano-Bicocca (Monza, Italy).
Availability of data and materials
All data supporting this article are available in the text and additional files.
GC and AC are the guarantors of this article. AC, CG, GB, JGL, TP, FVH, AG, MA, AP, and GG conceived of and designed the study. AC, FM, CG, GB, JGL, TP, FVH, AG, MA, AP, and GG analyzed and interpreted data. AC, FM, CG, and GG drafted the manuscript. All authors critically revised the manuscript for important intellectual content. All authors read and provided final approval of the final version.
Ethics approval and consent to participate
AC, FM, JGL, TP, and FVH declare that they have no competing interests. CG received fees for consultancies or lectures from Orion Pharma, ResMed, Medtronic, Philips, Air Liquide, and EOVE (all unrelated to the present work). GB received fees for lectures from Draeger Medical, GE Healthcare, and Pfizer; research grants from Draeger Medical; and is president and a shareholder of ReviewerCredits S.R.L. (all unrelated to the present work). AG received fees for consultancies or lectures from Orion, Pfizer, and MSD (all unrelated to the present work). MA received research grants from Toray, GE Healthcare, and Orion and participated on the boards and received personal fees from Maquet, Pfizer, and MSD (all unrelated to the present work). AP received fees from Maquet, Novalung, Xenios, Baxter, and Boerhinger Ingelheim (all unrelated to the present work). GG received fees for lectures from Thermo Fisher Scientific and Pfizer and travel accommodation support from Maquet and Biotest (all unrelated to the present work).
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