Gul, FethiKasapoglu, Umut SabriSabaz, Mehmet SuleymanAy, PinarOktay, Burcin DorukCaliskan, GulbaharDemir, Nalan2024-12-242024-12-2420232146-31232146-3131https://doi.org/10.4274/balkanmedj.galenos.2023.2023-6-90https://search.trdizin.gov.tr/tr/yayin/detay/1254258https://hdl.handle.net/20.500.12604/7837Background: Vaccines against coronavirus disease-19 (COVID-19) have been effective in preventing symptomatic diseases, hospitalizations, and intensive care unit (ICU) admissions. However, data regarding the effectiveness of COVID-19 vaccines in reducing mortality among critically ill patients with COVID-19 remains unclear.Aims: To determine the vaccination status and investigate the impact of the COVID-19 vaccine on the 28-day mortality in critically ill patients with COVID-19.Study Design: Multicenter prospective observational clinical study.Methods: This study was conducted in 60 hospitals with ICUs managing critically ill patients with COVID-19. Patients aged >= 18 years with confirmed COVID-19 who were admitted to the ICU were included. The present study had two phases. The first phase was designed as a one-day point prevalence study, and demographic and clinical findings were evaluated. In the second phase, the 28-day mortality was evaluated.Results: As of August 11, 2021, 921 patients were enrolled in the study. The mean age of the patients was 65.42 +/- 16.74 years, and 48.6% (n = 448) were female. Among the critically ill patients with COVID-19, 52.6% (n = 484) were unvaccinated, 7.7% (n = 71) were incompletely vaccinated, and 39.8% (n = 366) were fully vaccinated. A subgroup analysis of 817 patients who were unvaccinated (n = 484) or who had received two doses of the CoronaVac vaccine (n = 333) was performed. The 28-day mortality rate was 56.8% (n = 275) and 57.4% (n = 191) in the unvaccinated and two-dose CoronaVac groups, respectively. The 28-day mortality was associated with age, hypertension, the number of comorbidities, type of respiratory support, and APACHE II and sequential organ failure assessment scores (p < 0.05). The odds ratio for the 28-day mortality among those who had received two doses of CoronaVac was 0.591 (95% confidence interval: 0.413-0.848) (p = 0.004).Conclusion: Vaccination with at least two doses of CoronaVac within six months significantly decreased mortality in vaccinated patients than in unvaccinated patients.eninfo:eu-repo/semantics/openAccessArticle406435444Q2WOS:0010949803000091254258Q12-s2.0-851750399643786742810.4274/balkanmedj.galenos.2023.2023-6-90