Occurrence of Myopericarditis Following COVID-19 Vaccination Among Adults in the Eastern Region, Saudi Arabia: A Multicenter Study.

Background: Evidence supporting the possible causal association of myopericarditis with the coronavirus disease (COVID-19) vaccine has mainly come from case reports. Epidemiological evidence indicating an increased relative risk for myopericarditis after COVID-19 vaccination is lacking. Therefore, this study aimed to identify and assess all confirmed COVID-19 vaccine- related cases of myopericarditis presenting to major cardiac centers in the Eastern Region of Saudi Arabia, before and after the introduction of the COVID-19 vaccine.