(1) Background: There are limited data regarding the efficacy of convalescent plasma (CP) in critically ill patients admitted to the intensive care unit (ICU) due to coronavirus disease 2019 (COVID-19). We aimed to determine whether CP is associated with better clinical outcome among these patients. (2) Methods: A retrospective single-center study including adult patients with laboratory-confirmed SARS-CoV-2 infection admitted to the ICU for acute respiratory failure. The primary outcome was time to clinical improvement, within 28 days, defined as patient discharged alive or reduction of 2 points on a 6-point disease severity scale. (3) Results: Overall, 110 COVID-19 patients were admitted. Thirty-two patients (29%) received CP; among them, 62.5% received at least one CP with high neutralizing antibody titers (≥1:160). Clinical improvement occurred within 28 days in 14 patients (43.7%) of the CP group vs. 48 patients (61.5%) in the non-CP group (hazard ratio (HR): 0.75 (95% CI: 0.41–1.37), p = 0.35). After adjusting for potential confounding factors, CP was not independently associated with time to clinical improvement (HR: 0.53 (95% CI: 0.23–1.22), p = 0.14). Additionally, the average treatment effects of CP, calculated using the inverse probability weights (IPW), was not associated with the primary outcome (−0.14 days (95% CI: −3.19–2.91 days), p = 0.93). Hospital mortality did not differ between CP and non-CP groups (31.2% vs. 19.2%, p = 0.17, respectively). Comparing CP with high neutralizing antibody titers to the other group yielded the same findings. (4) Conclusions: In this study of life-threatening COVID-19 patients, CP was not associated with time to clinical improvement within 28 days, or hospital mortality.
【저자키워드】 convalescent plasma, neutralizing antibody, SARS-CoV-2, mechanical ventilation, intensive care unit, Critically ill, Life-threatening COVID-19, 【초록키워드】 COVID-19, coronavirus disease, Efficacy, Respiratory failure, Mortality, intensive care, disease severity, hospital, ICU, Clinical outcome, Probability, Hospital mortality, clinical, Patient, Clinical improvement, group, patients, COVID-19 patients, Neutralizing antibody titer, COVID-19 patient, reduction, Critically ill patient, Primary outcome, hazard ratio, average, life-threatening, CP group, laboratory-confirmed SARS-CoV-2 infection, single-center study, confounding factors, defined, not differ, occurred, calculated, determine, discharged, IPW, treatment effect, 【제목키워드】 COVID-19,