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Convalescent Plasma for Patients With Severe Coronavirus Disease 2019 (COVID-19): A Matched Cohort Study
Ralph Rogers1, Fadi Shehadeh1, Evangelia K Mylona1
1Division of Infectious Diseases, Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.
Insights
Convalescent plasma (CP) did not significantly reduce mortality or improve hospital discharge rates in severe COVID-19 patients. However, elderly patients receiving CP showed a trend toward better outcomes, warranting further investigation in targeted studies.
Area of Science:
- Infectious Diseases
- Hematology
- Critical Care Medicine
Background:
- The effectiveness of convalescent plasma (CP) as a treatment for coronavirus disease 2019 (COVID-19) remains uncertain.
- Severe COVID-19 cases present a significant challenge, necessitating evaluation of potential therapeutic interventions.
Purpose of the Study:
- To evaluate the impact of convalescent plasma (CP) treatment on in-hospital mortality and hospital discharge rates in patients with severe COVID-19.
- To identify potential subgroups that may benefit from CP therapy.
Main Methods:
- A matched cohort analysis comparing hospitalized severe COVID-19 patients who received CP with a control group.
- Univariate and multivariate Cox proportional-hazards models were used to assess mortality risk.
- Stratified log-rank analysis examined the time to hospital discharge.
Main Results:
- No significant difference in in-hospital mortality was observed between the CP group (12.5%) and the control group (15.8%).
- The overall rate of hospital discharge did not differ significantly between groups (RR 1.28, 95% CI .91-1.81).
- A significantly increased rate of hospital discharge was noted in patients aged 65 or older who received CP (RR 1.86, 95% CI 1.03-3.36).
- A higher frequency of transfusion reactions was observed in the CP group (2.8% per unit transfused).
Conclusions:
- Convalescent plasma treatment did not demonstrate a significant benefit in reducing mortality or improving discharge rates for severe COVID-19 patients.
- A potential positive effect of CP was observed in elderly patients (≥65 years), suggesting this subgroup may benefit.
- Further adequately powered randomized controlled trials are recommended to investigate CP efficacy specifically in the elderly COVID-19 population.
Background:
The efficacy of convalescent plasma (CP) for the treatment of coronavirus disease 2019 (COVID-19) remains unclear.
Methods:
In a matched cohort analysis of hospitalized patients with severe COVID-19, the impact of CP treatment on in-hospital mortality was evaluated using univariate and multivariate Cox proportional-hazards models, and the impact of CP treatment on time to hospital discharge was assessed using a stratified log-rank analysis.
Results:
In total, 64 patients who received CP a median of 7 days after symptom onset were compared to a matched control group of 177 patients. The incidence of in-hospital mortality was 12.5% and 15.8% in the CP and control groups, respectively (P = .52). There was no significant difference in the risk of in-hospital mortality between the 2 groups (adjusted hazard ratio [aHR] 0.93, 95% confidence interval [CI] .39-2.20). The overall rate of hospital discharge was not significantly different between the 2 groups (rate ratio [RR] 1.28, 95% CI .91-1.81), although there was a significantly increased rate of hospital discharge among patients 65-years-old or greater who received CP (RR 1.86, 95% CI 1.03-3.36). There was a greater than expected frequency of transfusion reactions in the CP group (2.8% reaction rate observed per unit transfused).
Conclusions:
We did not demonstrate a significant difference in risk of mortality or rate of hospital discharge between the CP and control groups. There was a signal for improved outcomes among the elderly, and further adequately powered randomized studies should target this subgroup when assessing the efficacy of CP treatment.
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