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Sivapalan P, Ellekjaer KL, Jessen MK, Meyhoff TS, Cronhjort M, Hjortrup PB, Wetterslev J, Granholm A, Møller MH, Perner A. Lower vs Higher Fluid Volumes in Adult Patients With Sepsis: An Updated Systematic Review With Meta-Analysis and Trial Sequential Analysis. Chest 2023; 164:892-912. [PMID: 37142091 PMCID: PMC10567931 DOI: 10.1016/j.chest.2023.04.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Revised: 03/06/2023] [Accepted: 04/19/2023] [Indexed: 05/06/2023] Open
Abstract
BACKGROUND IV fluids are recommended for adults with sepsis. However, the optimal strategy for IV fluid management in sepsis is unknown, and clinical equipoise exists. RESEARCH QUESTION Do lower vs higher fluid volumes improve patient-important outcomes in adult patients with sepsis? STUDY DESIGN AND METHODS We updated a systematic review with meta-analysis and trial sequential analysis of randomized clinical trials assessing lower vs higher IV fluid volumes in adult patients with sepsis. The coprimary outcomes were all-cause mortality, serious adverse events, and health-related quality of life. We followed the recommendations from the Cochrane Handbook and used the Grading of Recommendations Assessment, Development and Evaluation approach. Primary conclusions were based on trials with low risk of bias if available. RESULTS We included 13 trials (N = 4,006) with four trials (n = 3,385) added to this update. The meta-analysis of all-cause mortality in eight trials with low risk of bias showed a relative risk of 0.99 (97% CI, 0.89-1.10; moderate certainty evidence). Six trials with predefined definitions of serious adverse events showed a relative risk of 0.95 (97% CI, 0.83-1.07; low certainty evidence). Health-related quality of life was not reported. INTERPRETATION Among adult patients with sepsis, lower IV fluid volumes probably result in little to no difference in all-cause mortality compared with higher IV fluid volumes, but the interpretation is limited by imprecision in the estimate, which does not exclude potential benefit or harm. Similarly, the evidence suggests lower IV fluid volumes result in little to no difference in serious adverse events. No trials reported on health-related quality of life. TRIAL REGISTRATION PROSPERO; No.: CRD42022312572; URL: https://www.crd.york.ac.uk/prospero/.
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Affiliation(s)
- Praleene Sivapalan
- Department of Intensive Care, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark; Collaboration for Research in Intensive Care (CRIC), Copenhagen, Denmark.
| | - Karen L Ellekjaer
- Department of Intensive Care, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark; Collaboration for Research in Intensive Care (CRIC), Copenhagen, Denmark
| | - Marie K Jessen
- Research Center for Emergency Medicine, Aarhus University and University Hospital, Aarhus N, Denmark; Department of Anesthesiology and Intensive Care, Aarhus University Hospital, Aarhus, Denmark
| | - Tine S Meyhoff
- Department of Intensive Care, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark; Collaboration for Research in Intensive Care (CRIC), Copenhagen, Denmark
| | - Maria Cronhjort
- Karolinska Institutet, Department of Clinical Science and Education, Södersjukhuset, Section of Anaesthesia and Intensive Care, Stockholm, Sweden
| | - Peter B Hjortrup
- Collaboration for Research in Intensive Care (CRIC), Copenhagen, Denmark; Department of Cardiothoracic Anaesthesia and Intensive Care, The Heart Center, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | | | - Anders Granholm
- Department of Intensive Care, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark; Collaboration for Research in Intensive Care (CRIC), Copenhagen, Denmark
| | - Morten H Møller
- Department of Intensive Care, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark; Collaboration for Research in Intensive Care (CRIC), Copenhagen, Denmark
| | - Anders Perner
- Department of Intensive Care, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark; Collaboration for Research in Intensive Care (CRIC), Copenhagen, Denmark
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Singh G, Shaw A. SMART decisions in fluid management are worth their SALT. J Thorac Cardiovasc Surg 2020; 160:1250-1254. [PMID: 32279957 DOI: 10.1016/j.jtcvs.2019.12.126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Revised: 12/24/2019] [Accepted: 12/31/2019] [Indexed: 12/13/2022]
Affiliation(s)
- Gurmeet Singh
- Division of Cardiac Surgery, Department of Critical Care Medicine, University of Alberta, Edmonton, Alberta, Canada; Division of Cardiac Surgery, Department of Surgery, University of Alberta, Edmonton, Alberta, Canada; Department of Anesthesiology and Pain Medicine, University of Alberta, Edmonton, Alberta, Canada; Mazankowski Alberta Heart Institute, Edmonton, Alberta, Canada
| | - Andrew Shaw
- Department of Anesthesiology and Pain Medicine, University of Alberta, Edmonton, Alberta, Canada; Mazankowski Alberta Heart Institute, Edmonton, Alberta, Canada.
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Kjaer MBN, Meyhoff TS, Madsen MB, Hjortrup PB, Møller MH, Egerod I, Wetterslev J, Lange T, Cronhjort M, Laake JH, Jakob SM, Nalos M, Pettilä V, van der Horst ICC, Ostermann M, Mouncey P, Cecconi M, Ferrer R, Malbrain MLNG, Ahlstedt C, Hoffmann S, Bestle MH, Gyldensted L, Nebrich L, Russell L, Vang M, Sølling C, Brøchner AC, Rasmussen BS, Perner A. Long-term patient-important outcomes after septic shock: A protocol for 1-year follow-up of the CLASSIC trial. Acta Anaesthesiol Scand 2020; 64:410-416. [PMID: 31828753 DOI: 10.1111/aas.13519] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 11/24/2019] [Indexed: 11/29/2022]
Abstract
BACKGROUND In patients with septic shock, mortality is high, and survivors experience long-term physical, mental and social impairments. The ongoing Conservative vs Liberal Approach to fluid therapy of Septic Shock in Intensive Care (CLASSIC) trial assesses the benefits and harms of a restrictive vs standard-care intravenous (IV) fluid therapy. The hypothesis is that IV fluid restriction improves patient-important long-term outcomes. AIM To assess the predefined patient-important long-term outcomes in patients randomised into the CLASSIC trial. METHODS In this pre-planned follow-up study of the CLASSIC trial, we will assess all-cause mortality, health-related quality of life (HRQoL) and cognitive function 1 year after randomisation in the two intervention groups. The 1-year mortality will be collected from electronic patient records or central national registries in most participating countries. We will contact survivors and assess EuroQol 5-Dimension, -5-Level (EQ-5D-5L) and EuroQol-Visual Analogue Scale and Montreal Cognitive Assessment 5-minute protocol score. We will analyse mortality by logistic regression and use general linear models to assess HRQoL and cognitive function. DISCUSSION With this pre-planned follow-up study of the CLASSIC trial, we will provide patient-important data on long-term survival, HRQoL and cognitive function of restrictive vs standard-care IV fluid therapy in patients with septic shock.
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Affiliation(s)
- Maj-Brit N Kjaer
- Department of Intensive Care, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
- Centre for Research in Intensive Care (CRIC), Copenhagen, Denmark
| | - Tine S Meyhoff
- Department of Intensive Care, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
- Centre for Research in Intensive Care (CRIC), Copenhagen, Denmark
| | - Martin B Madsen
- Department of Intensive Care, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Peter B Hjortrup
- Department of Intensive Care, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Morten Hylander Møller
- Department of Intensive Care, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
- Centre for Research in Intensive Care (CRIC), Copenhagen, Denmark
| | - Ingrid Egerod
- Department of Intensive Care, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
- Centre for Research in Intensive Care (CRIC), Copenhagen, Denmark
| | - Jørn Wetterslev
- Centre for Research in Intensive Care (CRIC), Copenhagen, Denmark
- Copenhagen Trial Unit, Centre for Clinical Intervention Research, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Theis Lange
- Section of Biostatistics, Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Maria Cronhjort
- Section of Anaesthesia and Intensive Care, Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
| | - Jon H Laake
- Division of Emergencies and Critical Care, Department of Anaesthesiology, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | - Stephan M Jakob
- Department of Intensive Care Medicine, University Hospital Bern (Inselspital), University of Bern, Bern, Switzerland
| | - Marek Nalos
- Medical Intensive Care Unit, 1. Interni klinika, Fakultni Nemocnice, Plzen, Czech Republic
| | - Ville Pettilä
- Division of Intensive Care Medicine, Department of Anaesthesiology, Intensive Care and Pain Medicine, Helsinki University Hospital, University of Helsinki, Helsinki, Finland
| | - Iwan C C van der Horst
- Department of Intensive Care, Maastricht University Medical Center+, University Maastricht, Maastrict, The Netherlands
| | - Marlies Ostermann
- Department of Intensive Care, Guy's and St Thomas' Hospital, London, UK
| | - Paul Mouncey
- Clinical Trial Unit, Intensive Care National Audit & Research Centre (ICNARC), London, UK
| | - Maurizio Cecconi
- Department of Intensive Care Medicine, Humanitas Research Hospital, Milan, Italy
| | - Ricard Ferrer
- Department of Intensive Care, Hospital Vall d'Hebron, Barcelona, Spain
| | - Manu L N G Malbrain
- Department of Intensive Care Medicine, University Hospital Brussels (UZB), Jette, Belgium
- Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Christian Ahlstedt
- Department of Perioperative Medicine and Intensive Care, Karolinska University Hospital Huddinge, Stockholm, Sweden
| | - Søren Hoffmann
- Department of Anaesthesia and Intensive Care, Copenhagen University Hospital, Bispebjerg, Copenhagen, Denmark
| | - Morten H Bestle
- Department of Anaesthesia and Intensive Care, Nordsjaellands Hospital, University Hospital of Copenhagen, Hillerød, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | | | - Lars Nebrich
- Department of Anaesthesia and Intensive Care, Zealand University Hospital, Køge, Denmark
| | - Lene Russell
- Department of Anaesthesia and Intensive Care, Zealand University Hospital, Roskilde, Denmark
- Copenhagen Academy for Medical Education and Simulation, Rigshospitalet, Copenhagen, Denmark
| | - Marianne Vang
- Department of Anaesthesia and Intensive Care, Randers Hospital, Randers, Denmark
| | - Christoffer Sølling
- Department of Anaesthesia and Intensive Care, Viborg Hospital, Viborg, Denmark
| | - Anne C Brøchner
- Department of Anaesthesia and Intensive Care, Lillebaelt Hospital, Kolding, Denmark
| | - Bodil S Rasmussen
- Centre for Research in Intensive Care (CRIC), Copenhagen, Denmark
- Department of Anaesthesia and Intensive Care, Aalborg University Hospital, Aalborg, Denmark
| | - Anders Perner
- Department of Intensive Care, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
- Centre for Research in Intensive Care (CRIC), Copenhagen, Denmark
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Meyhoff TS, Møller MH, Hjortrup PB, Cronhjort M, Perner A, Wetterslev J. Lower vs Higher Fluid Volumes During Initial Management of Sepsis: A Systematic Review With Meta-Analysis and Trial Sequential Analysis. Chest 2020; 157:1478-1496. [PMID: 31982391 DOI: 10.1016/j.chest.2019.11.050] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 11/05/2019] [Accepted: 11/25/2019] [Indexed: 12/12/2022] Open
Abstract
OBJECTIVE IV fluids are recommended during the initial management of sepsis, but the quality of evidence is low, and clinical equipoise exists. We aimed to assess patient-important benefits and harms of lower vs higher fluid volumes in adult patients with sepsis. METHODS We conducted a systematic review with meta-analysis and trial sequential analysis (TSA) of randomized clinical trials of IV fluid volume separation in adult patients with sepsis. We adhered to our published protocol; the Cochrane handbook; the Preferred Reporting Items for Systematic Reviews and Meta-Analyses; and the Grading of Recommendations Assessment, Development and Evaluation statements. The primary outcomes were all-cause mortality, serious adverse events (SAEs), and quality of life. RESULTS We included nine trials (n = 637); all were published after 2015 and had an overall high risk of bias. We found no statistically significant difference between lower vs higher fluid volumes in all-cause mortality (relative risk [RR], 0.87; 95% CI, 0.69-1.10; I2 = 0%; TSA-adjusted CI, 0.34-2.22) or SAEs (RR, 0.91; 95% CI, 0.78-1.05; I2 = 0%; TSA-adjusted CI, 0.68-1.21). No trials reported on quality of life. We did not find differences in the secondary or exploratory outcomes. The quality of evidence was very low across all outcomes. CONCLUSIONS In this systematic review, we found very low quantity and quality of evidence supporting the decision on the volumes of IV fluid therapy in adults with sepsis. TRIAL REGISTRY ClinicalTrials.gov; No.: NCT03668236; URL: www.clinicaltrials.gov.
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Affiliation(s)
- Tine Sylvest Meyhoff
- Department of Intensive Care, Copenhagen, Denmark; Collaboration for Research in Intensive Care, Copenhagen, Denmark.
| | - Morten Hylander Møller
- Department of Intensive Care, Copenhagen, Denmark; Collaboration for Research in Intensive Care, Copenhagen, Denmark
| | - Peter Buhl Hjortrup
- Department of Intensive Care, Copenhagen, Denmark; Collaboration for Research in Intensive Care, Copenhagen, Denmark
| | - Maria Cronhjort
- Karolinska Institutet, Department of Clinical Science and Education, Södersjukhuset, Section of Anaesthesia and Intensive Care, Sweden
| | - Anders Perner
- Department of Intensive Care, Copenhagen, Denmark; Collaboration for Research in Intensive Care, Copenhagen, Denmark
| | - Jørn Wetterslev
- Copenhagen Trial Unit, Centre for Clinical Intervention Research, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark; Collaboration for Research in Intensive Care, Copenhagen, Denmark
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5
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Meyhoff TS, Hjortrup PB, Møller MH, Wetterslev J, Lange T, Kjær MN, Jonsson AB, Hjortsø CJS, Cronhjort M, Laake JH, Jakob SM, Nalos M, Pettilä V, Horst I, Ostermann M, Mouncey P, Rowan K, Cecconi M, Ferrer R, Malbrain MLNG, Ahlstedt C, Hoffmann S, Bestle MH, Nebrich L, Russell L, Vang M, Rasmussen ML, Sølling C, Rasmussen BS, Brøchner AC, Perner A. Conservative vs liberal fluid therapy in septic shock (CLASSIC) trial-Protocol and statistical analysis plan. Acta Anaesthesiol Scand 2019; 63:1262-1271. [PMID: 31276193 DOI: 10.1111/aas.13434] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 06/01/2019] [Indexed: 01/03/2023]
Abstract
INTRODUCTION Intravenous (IV) fluid is a key intervention in the management of septic shock. The benefits and harms of lower versus higher fluid volumes are unknown and thus clinical equipoise exists. We describe the protocol and detailed statistical analysis plan for the conservative versus liberal approach to fluid therapy of septic shock in the Intensive Care (CLASSIC) trial. The aim of the CLASSIC trial is to assess benefits and harms of IV fluid restriction versus standard care in adult intensive care unit (ICU) patients with septic shock. METHODS CLASSIC trial is an investigator-initiated, international, randomised, stratified, and analyst-blinded trial. We will allocate 1554 adult patients with septic shock, who are planned to be or are admitted to an ICU, to IV fluid restriction versus standard care. The primary outcome is mortality at day 90. Secondary outcomes are serious adverse events (SAEs), serious adverse reactions (SARs), days alive at day 90 without life support, days alive and out of the hospital at day 90 and mortality, health-related quality of life (HRQoL), and cognitive function at 1 year. We will conduct the statistical analyses according to a pre-defined statistical analysis plan, including three interim analyses. For the primary analysis, we will use logistic regression adjusted for the stratification variables comparing the two interventions in the intention-to-treat (ITT) population. DISCUSSION The CLASSIC trial results will provide important evidence to guide clinicians' choice regarding the IV fluid therapy in adults with septic shock.
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Affiliation(s)
- Tine Sylvest Meyhoff
- Department of Intensive Care Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
- Centre for Research in Intensive Care (CRIC) Copenhagen Denmark
| | - Peter Buhl Hjortrup
- Department of Intensive Care Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
| | - Morten Hylander Møller
- Department of Intensive Care Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
- Centre for Research in Intensive Care (CRIC) Copenhagen Denmark
| | - Jørn Wetterslev
- Centre for Research in Intensive Care (CRIC) Copenhagen Denmark
- Copenhagen Trial Unit, Centre for Clinical Intervention Research Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
| | - Theis Lange
- Department of Public Health, Section of Biostatistics University of Copenhagen Copenhagen Denmark
| | - Maj‐Brit Nørregaard Kjær
- Department of Intensive Care Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
- Centre for Research in Intensive Care (CRIC) Copenhagen Denmark
| | - Andreas Bender Jonsson
- Department of Intensive Care Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
| | | | - Maria Cronhjort
- Department of Clinical Science and Education, Section of Anaesthesia and Intensive Care Karolinska Institutet, Södersjukhuset Stockholm Sweden
| | - Jon Henrik Laake
- Department of Anaesthesiology, Division of Emergencies and Critical Care Rikshospitalet, Oslo University Hospital Oslo Norway
| | - Stephan M. Jakob
- Department of Intensive Care Medicine University Hospital Bern (Inselspital), University of Bern Bern Switzerland
| | - Marek Nalos
- Medical Intensive Care Unit Interni klinika, Fakultni Nemocnice Plzen Czech Republic
| | - Ville Pettilä
- Division of Intensive Care Medicine, Department of Anaesthesiology, Intensive Care and Pain Medicine University of Helsinki and Helsinki University Hospital Helsinki Finland
| | - Iwan Horst
- Department of Intensive Care University Medical Centre Groningen Groningen The Netherlands
| | - Marlies Ostermann
- Department of Intensive Care Guy’s and St Thomas’ Hospital London UK
| | - Paul Mouncey
- Intensive Care National Audit & Research Centre (ICNARC) London UK
| | - Kathy Rowan
- Intensive Care National Audit & Research Centre (ICNARC) London UK
| | - Maurizio Cecconi
- Department of Intensive Care Medicine Humanitas Research Hospital Milan Italy
| | - Ricard Ferrer
- Department of Intensive Care Hospital Vall d'Hebron Barcelona Spain
| | - Manu L. N. G. Malbrain
- Department of Intensive Care Medicine University Hospital Brussels (UZB) Jette Belgium
- Faculty of Medicine and Pharmacy Vrije Universiteit Brussel (VUB) Brussels Belgium
| | - Christian Ahlstedt
- Department of Perioperative Medicine and Intensive Care Karolinska University Hospital Huddinge Stockholm Sweden
| | - Søren Hoffmann
- Department of Anaesthesia and Intensive Care Copenhagen University Hospital, Bispebjerg Copenhagen Denmark
| | - Morten Heiberg Bestle
- Department of Anaesthesia and Intensive Care Nordsjællands Hospital, University Hospital of Copenhagen Hillerød Denmark
- Department of Clinical Medicine University of Copenhagen Copenhagen Denmark
| | - Lars Nebrich
- Department of Anaesthesia and Intensive Care Zealand University Hospital Køge Denmark
| | - Lene Russell
- Department of Anaesthesia and Intensive Care Zealand University Hospital Roskilde Denmark
- Copenhagen Academy for Medical Education and Simulation, Rigshospitalet Copenhagen Denmark
| | - Marianne Vang
- Department of Anaesthesia and Intensive Care Randers Hospital Randers Denmark
| | | | | | - Bodil Steen Rasmussen
- Department of Anaesthesia and Intensive Care Aalborg University Hospital Aalborg Denmark
| | | | - Anders Perner
- Department of Intensive Care Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
- Centre for Research in Intensive Care (CRIC) Copenhagen Denmark
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Perner A, Cecconi M, Cronhjort M, Darmon M, Jakob SM, Pettilä V, van der Horst ICC. Expert statement for the management of hypovolemia in sepsis. Intensive Care Med 2018; 44:791-798. [PMID: 29696295 DOI: 10.1007/s00134-018-5177-x] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 04/11/2018] [Indexed: 12/13/2022]
Abstract
Hypovolemia is frequent in patients with sepsis and may contribute to worse outcome. The management of these patients is impeded by the low quality of the evidence for many of the specific components of the care. In this paper, we discuss recent advances and controversies in this field and give expert statements for the management of hypovolemia in patients with sepsis including triggers and targets for fluid therapy and volumes and types of fluid to be given. Finally, we point to unanswered questions and suggest a roadmap for future research.
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Affiliation(s)
- Anders Perner
- Department of Intensive Care, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
| | - Maurizio Cecconi
- Department Anaesthesia and Intensive Care Units, IRCCS Istituto Clinico Humanitas, Humanitas University, Milan, Italy
| | - Maria Cronhjort
- Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
| | - Michael Darmon
- Medical ICU, Saint-Louis University Hospital, AP-HP, Paris, France
- ECSTRA Team, Biostatistics and Clinical Epidemiology, UMR 1153 (Center of Epidemiology and Biostatistic Sorbonne Paris Cité, CRESS), INSERM, Paris, France
- Paris-7 Medical School, Université Paris-Diderot, Sorbonne-Paris-Cité, Paris, France
| | - Stephan M Jakob
- Department of Intensive Care Medicine, University Hospital Bern (Inselspital), University of Bern, Bern, Switzerland
| | - Ville Pettilä
- Department of Anesthesiology, Intensive Care and Pain Medicine, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Iwan C C van der Horst
- Department of Critical Care, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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