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Taylor EH, Marson EJ, Elhadi M, Macleod KDM, Yu YC, Davids R, Boden R, Overmeyer RC, Ramakrishnan R, Thomson DA, Coetzee J, Biccard BM. Factors associated with mortality in patients with COVID-19 admitted to intensive care: a systematic review and meta-analysis. Anaesthesia 2021; 76:1224-1232. [PMID: 34189735 PMCID: PMC8444810 DOI: 10.1111/anae.15532] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/29/2021] [Indexed: 01/08/2023]
Abstract
Identification of high-risk patients admitted to intensive care with COVID-19 may inform management strategies. The objective of this meta-analysis was to determine factors associated with mortality among adults with COVID-19 admitted to intensive care by searching databases for studies published between 1 January 2020 and 6 December 2020. Observational studies of COVID-19 adults admitted to critical care were included. Studies of mixed cohorts and intensive care cohorts restricted to a specific patient sub-group were excluded. Dichotomous variables were reported with pooled OR and 95%CI, and continuous variables with pooled standardised mean difference (SMD) and 95%CI. Fifty-eight studies (44,305 patients) were included in the review. Increasing age (SMD 0.65, 95%CI 0.53-0.77); smoking (OR 1.40, 95%CI 1.03-1.90); hypertension (OR 1.54, 95%CI 1.29-1.85); diabetes (OR 1.41, 95%CI 1.22-1.63); cardiovascular disease (OR 1.91, 95%CI 1.52-2.38); respiratory disease (OR 1.75, 95%CI 1.33-2.31); renal disease (OR 2.39, 95%CI 1.68-3.40); and malignancy (OR 1.81, 95%CI 1.30-2.52) were associated with mortality. A higher sequential organ failure assessment score (SMD 0.86, 95%CI 0.63-1.10) and acute physiology and chronic health evaluation-2 score (SMD 0.89, 95%CI 0.65-1.13); a lower PaO2 :FI O2 (SMD -0.44, 95%CI -0.62 to -0.26) and the need for mechanical ventilation at admission (OR 2.53, 95%CI 1.90-3.37) were associated with mortality. Higher white cell counts (SMD 0.37, 95%CI 0.22-0.51); neutrophils (SMD 0.42, 95%CI 0.19-0.64); D-dimers (SMD 0.56, 95%CI 0.43-0.69); ferritin (SMD 0.32, 95%CI 0.19-0.45); lower platelet (SMD -0.22, 95%CI -0.35 to -0.10); and lymphocyte counts (SMD -0.37, 95%CI -0.54 to -0.19) were all associated with mortality. In conclusion, increasing age, pre-existing comorbidities, severity of illness based on validated scoring systems, and the host response to the disease were associated with mortality; while male sex and increasing BMI were not. These factors have prognostic relevance for patients admitted to intensive care with COVID-19.
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Affiliation(s)
- E H Taylor
- Global Surgery Division, University of Cape Town, Cape Town, South Africa
| | - E J Marson
- College of Medical and Dental Sciences, Birmingham, UK
| | - M Elhadi
- Faculty of Medicine, University of Tripoli, Tripoli, Libya
| | | | - Y C Yu
- Department of Anaesthesiology and Critical Care, Stellenbosch University and Tygerberg Hospital, Cape Town, South Africa
| | - R Davids
- Department of Anaesthesiology and Critical Care, Stellenbosch University and Tygerberg Hospital, Cape Town, South Africa
| | - R Boden
- Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - R C Overmeyer
- Department of Anaesthesiology and Critical Care, Stellenbosch University and Tygerberg Hospital, Cape Town, South Africa
| | - R Ramakrishnan
- National Perinatal Epidemiology Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK
| | - D A Thomson
- Division of Critical Care, University of Cape Town, Cape Town, South Africa
| | - J Coetzee
- Department of Anaesthesiology and Critical Care, Stellenbosch University and Tygerberg Hospital, Cape Town, South Africa
| | - B M Biccard
- Department of Anaesthesia and Peri-operative Medicine, Groote Schuur Hospital, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
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