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.
Abstract

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