INTRODUCTION: Persistent post-COVID syndrome, also referred to as long COVID, is a pathologic entity that involves persistent physical, medical, and cognitive sequelae following COVID-19. Decreased fitness has repeatedly been reported in numerous studies dealing with post-COVID syndrome, however, it is still not fully clear which groups of patients may be more susceptible for persisting symptoms. AIM: The aim of our study was to evaluate the number of post-COVID patients with cardiac symptoms, where these patients were evaluated by CPET and the results compared with a control group of patients. METHODS: Follow-up of patients in post-COVID outpatient clinic from 1 March 2020 to 31 May 2022. Inclusion criteria were positive PCR test for SARS-CoV-2 and age 18-100. The initial examination was performed 4-12 weeks after the disease onset. All patients with possible cardiac symptoms had completed cardiopulmonary exercise testing. The control group was randomly selected from a database of clients in 2019, with the preventive reason for evaluation. RESULTS: From 1 March 2020 to 31 May 2022, 2732 patients (45.7% males) were evaluated with a mean age of 54.6 ± 14.7. CPET was indicated only in 97 patients (3.5%). Seventy-four patients (26 male) achieved the exercise maximum and a comparison were made with a control group (same age (p = 0.801), BMI (p = 0.721), and sex ratio). No significant dependence between the parameter VO2 max mL/kg/min and post-COVID disability was demonstrated (p = 0.412). Spearman's correlation analysis did not show a significant relationship between the parameter VO2 max mL/kg/min and the severity of COVID-19 (p = 0.285). CONCLUSIONS: Cardiac symptoms occurred in only a small percentage of patients in our study. There is a need for further studies that would objectively evaluate the effect of COVID-19 disease on the patient's health.

Center for Digital Health University Hospital Olomouc Palacky University Olomouc 779 00 Olomouc Czech Republic

Department of Respiratory Medicine Faculty of Medicine and Dentistry University Hospital Brno Masaryk University Brno 601 77 Brno Czech Republic

Department of Respiratory Medicine Faculty of Medicine and Dentistry University Hospital Olomouc Palacky University Olomouc 779 00 Olomouc Czech Republic

Department of Sport Medicine and Cardiovascular Rehabilitation University Hospital Olomouc Palacky University Olomouc 779 00 Olomouc Czech Republic

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