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Gavrielatou E, Xourgia E, Xixi NA, Mantelou AG, Ischaki E, Kanavou A, Zervakis D, Routsi C, Kotanidou A, Siempos II. Effect of Vitamin C on Clinical Outcomes of Critically Ill Patients With COVID-19: An Observational Study and Subsequent Meta-Analysis. Front Med (Lausanne) 2022; 9:814587. [PMID: 35223911 PMCID: PMC8873176 DOI: 10.3389/fmed.2022.814587] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 01/19/2022] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Whether vitamin C provides any benefit when administered in critically ill patients, including those with coronavirus disease (COVID-19), is controversial. We endeavored to estimate the effect of administration of vitamin C on clinical outcomes of critically ill patients with COVID-19 by performing an observational study and subsequent meta-analysis. METHODS Firstly, we conducted an observational study of critically ill patients with laboratory-confirmed COVID-19 who consecutively underwent invasive mechanical ventilation in an academic intensive care unit (ICU) during the second pandemic wave. We compared all-cause mortality of patients receiving vitamin C ("vitamin C" group) or not ("control" group) on top of standard-of-care. Subsequently, we systematically searched PubMed and CENTRAL for relevant studies, which reported on all-cause mortality (primary outcome) and/or morbidity of critically ill patients with COVID-19 receiving vitamin C or not treatment. Pooled risk ratio (RR) and 95% confidence intervals (CI) were calculated using a random effects model. The meta-analysis was registered with PROSPERO. RESULTS In the observational study, baseline characteristics were comparable between the two groups. Mortality was 20.0% (2/10) in the vitamin C group vs. 47.6% (49/103; p = 0.11) in the control group. Subsequently, the meta-analysis included 11 studies (6 observational; five randomized controlled trials) enrolling 1,807 critically ill patients with COVID-19. Mortality of patients receiving vitamin C on top of standard-of-care was not lower than patients receiving standard-of-care alone (25.8 vs. 34.7%; RR 0.85, 95% CI 0.57-1.26; p = 0.42). CONCLUSIONS After combining results of our observational cohort with those of relevant studies into a meta-analysis of data from 1,807 patients, we found that administration vitamin C as opposed to standard-of-care alone might not be associated with lower of mortality among critically ill patients with COVID-19. Additional evidence is anticipated from relevant large randomized controlled trials which are currently underway. SYSTEMATIC REVIEW REGISTRATION https://www.crd.york.ac.uk/prospero/, identifier: CRD42021276655.
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Affiliation(s)
- Evdokia Gavrielatou
- First Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Eleni Xourgia
- First Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Nikoleta A. Xixi
- First Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Athina G. Mantelou
- First Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Eleni Ischaki
- First Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Aggeliki Kanavou
- First Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Dimitris Zervakis
- First Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Christina Routsi
- First Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Anastasia Kotanidou
- First Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Ilias I. Siempos
- First Department of Critical Care Medicine and Pulmonary Services, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, New York-Presbyterian Hospital, Weill Cornell Medical Center, Weill Cornell Medicine, New York, NY, United States
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Xing X, Xu M, Yang L, Zhang W, Niu X, Gao D. The efficacy of intravenous vitamin C in critically ill patients: A meta-analysis of randomized controlled trials. Clin Nutr 2021; 40:2630-2639. [PMID: 33933729 DOI: 10.1016/j.clnu.2021.03.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 02/18/2021] [Accepted: 03/08/2021] [Indexed: 12/29/2022]
Abstract
BACKGROUND & AIMS A large number of clinical studies have shown that intravenous vitamin C supplementation is beneficial for critically ill patients, but current research conclusions are controversial. This meta-analysis included high-quality randomized controlled trials (RCTs) to evaluate the efficacy of intravenous vitamin C in critically ill patients. METHODS We searched PubMed, EMBASE and the Cochrane Library from inception to August 15, 2020 to identify published reports of RCTs evaluating the role of intravenous vitamin C in critically ill patients. Risk ratios values (RRs) and 95% confidence intervals (CIs) were calculated by random-effects meta-analysis. Trial sequential analysis (TSA), meta-regression, subgroup analyses and sensitivity analyses were also performed. RESULTS Our meta-analysis included 18 RCTs involving 2001 patients (1005 with vitamin C treatment and 996 control treatment). Intravenous vitamin C administration reduced the intensive care unit (ICU) length of stay (LOS) (MD = -0.36, 95% CI: -0.60 to -0.11, P = 0.004) and hospital LOS (MD = -1.50, 95% CI: -2.64 to -0.35, P = 0.01) but had no significant effect on the longest follow-up mortality, hospital or ICU mortality and change in Sequential Organ Failure Assessment (SOFA) score. TSAs for mortality, ICU and hospital LOS were inconclusive. CONCLUSIONS Intravenous vitamin C administration may shorten ICU LOS and hospital LOS. It had no effect on mortality and organ failure. All TSAs were inconclusive, and the value of vitamin C for critically ill patients needs to be demonstrated in more high-quality RCTs.
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Affiliation(s)
- Xin Xing
- Department of Cardiology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Min Xu
- Department of Cardiology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Lijun Yang
- Department of Cardiology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Wenqian Zhang
- Department of Cardiology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Xiaolin Niu
- Department of Cardiology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China; Department of Cardiology, Meishan Brach of the Third Affiliated Hospital, Yanan University School of Medical, Meishan, Sichuan, PR China.
| | - Dengfeng Gao
- Department of Cardiology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China.
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