PT - JOURNAL ARTICLE AU - Gaine, Sean AU - Devitt, Patrick AU - Coughlan, John Joseph AU - Pearson, Ian TI - COVID-19-associated myocarditis presenting as new-onset heart failure and atrial fibrillation AID - 10.1136/bcr-2021-244027 DP - 2021 Jul 01 TA - BMJ Case Reports PG - e244027 VI - 14 IP - 7 4099 - http://casereports.bmj.com/content/14/7/e244027.short 4100 - http://casereports.bmj.com/content/14/7/e244027.full SO - BMJ Case Reports2021 Jul 01; 14 AB - A 58-year-old man presented to the emergency department with recent-onset palpitations and progressive exertional dyspnoea. ECG demonstrated new-onset atrial fibrillation. Transthoracic echocardiogram showed global impairment in left ventricular systolic function with left ventricular ejection fraction of 20%. Cardiac MRI (CMRI) demonstrated generalised severe myocarditis. A SARS-CoV-2 PCR was positive for SARS-CoV-2 RNA. As such, we diagnosed our patient with COVID-19-associated myocarditis based on CMRI appearances and positive SARS-CoV-2 swab. This case highlights that COVID-19-associated myocarditis can present as new atrial fibrillation and heart failure without the classic COVID-19-associated symptoms.