Methods and materials
Study setting and protocols
This prospective cohort study was performed during Iran’s third COVID-19 wave in November 2020 in Rajaie Cardiovascular Medical and Research Center’s (RCMRC) employees who had been previously infected with COVID-19. A total of 63 Individuals with an earlier positive reverse transcriptase-polymerase chain reaction test (RT-PCR) were planned to undergo echocardiography at two different time points. The early echocardiography was performed 6 to 8 weeks after COVID-19 recovery, and the late follow-up echocardiography was done six months after the COVID-19 onset. Participants who had undergone both early and late echocardiographic examinations were enrolled in this study. Written informed consent was obtained before each subject’s study participation. The manuscript is written and formulated in accordance with the STROBE checklist (8).