Retrospective nested study of demographic characteristics, lethality and discharge rate of COVID-19 inpatients in central south of Bulgaria

ABSTRACT

Introduction: SARS-CoV-2 infection has affected more than 683 million people worldwide with 6.8 million deaths. Unfortunately, Bulgaria is one of the most severely affected European Union (EU) member-states with one of the highest mortality rates. Aim: The study aims to provide a description of the demographic characteristics, discharge rate, and fatality rate of COVID-19-diagnosed patients in one region of Central South Bulgaria in 2021. Materials and methods: A retrospective nested case series study was conducted among patients hospitalized with a confirmed diagnosis of SARS-CoV-2 infection between January 1st and December 31st, 2021. Anonymized patient data on age, sex, admission and discharge dates, treatment, and the outcome was collected from hospital electronic patient records and analyzed using descriptive statistics. Results: Data from 1630 (51% male) patients were identified. The mean age was 63.64 years (+or-15.23). 1342 (82%) of the patients were discharged. The mean age of the diseased was 70.88 years (+or-10.05). 1455 (89%) patients received only symptomatic therapy, 155 (10%) patients were treated with remdesivir (VekluryR), 11 (1%) patients were treated with casirivimab/imdevimab (RonapreveR) and 9 (1%) patients were administered regdanvimab (RegkironaR). Conclusions: The study results demonstrate that Bulgarian patients with COVID-19 were treated according to the best global and national evidencebased guidelines. Lethality and discharge rates are in concordance with global trends and outcomes.