Abstract
This study analyzed 550 hemodialysis patients, 469 unvaccinated and 81 vaccinated against COVID-19, to assess the impact on infection rates, mortality, and clinical/laboratory parameters. Gender distribution was similar (p = 0.209), but the vaccinated group's median age was significantly lower (p = 0.005). Hospitalization rates showed no significant difference (p = 0.987), while mortality was lower in the vaccinated group (p = 0.041). Only uric acid levels were significantly higher in the vaccinated group (p = 0.009); other parameters, including creatinine and B-type natriuretic peptide, showed no significant differences. Age was an independent predictor of mortality (HR = 1.07, p < 0.001). Peak mortality occurred in December 2022 and January 2023, predominantly among unvaccinated patients. Although vaccination lowered mortality, it did not significantly affect long-term survival rates (p = 0.308). Logistic regression identified age and dialysis duration as significant mortality factors. Monthly death counts indicated higher mortality among unvaccinated patients during peak pandemic months, suggesting that vaccination provides some protection, though no significant long-term survival benefit was found.