Eosinophilic Endomyocarditis After COVID-19 Infection in a Heart Transplant Recipient

Eosinophilic myocarditis (EM) is a rare cause of heart failure, with high in-hospital mortality associated with fulminant disease. A 61-year-old female transplant recipient was diagnosed with COVID-19 after presenting with 2 days of constitutional symptoms. She developed acute heart failure from EM. After an initial response to inotropic support and corticosteroids, she had a relapse with de novo peripheral eosinophilia which responded to further eosinophilic myocarditis management and the addition of mepolizumab. Although there have been reports after COVID-19 vaccination, association with active SARS-CoV-2 infection is rare. This paper reports, for the first time, the case of a heart transplant recipient with EM after COVID-19.