Researchers analyzed data from 92 consecutive adult patients with myocarditis and abnormalities on cardiac MRI performed between 2019 and 2021. Patients were classified into three groups: myocarditis after COVID-19 vaccination, myocarditis after COVID-19 infection and myocarditis not associated COVID-19 vaccination or infection.
Three other key findings:
- Twenty-two percent of patients had myocarditis after vaccination; 11 percent had myocarditis after illness; and 66 percent had myocarditis for other reasons.
- Fourteen of the vaccinated patients were admitted to a hospital with a median length of stay of three days, but none were admitted to the intensive care unit.
- All patients with vaccine-associated myocarditis were asymptomatic with no adverse events during a short follow-up visit.
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