Atrial Fibrillation - COVID Photo (IMAGE) Intermountain Healthcare Caption A new study from researchers at Intermountain Healthcare in Salt Lake City finds that patients with atrial fibrillation, the most common type of heart arrhythmia in adults, are at significantly higher risk to experience serious complications from COVID-19 illness. Credit Intermountain Healthcare Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.