by American College of Physicians A 12 lead ECG showing atrial fibrillation at approximately 150 beats per minute. Credit: James Heilman, MD/Wikipedia/CC BY-SA 3.0 A cohort study of more than 90,000 older adults diagnosed with atrial fibrillation (Afib) who were treated with anticoagulants found that treatment with amiodarone during apixaban or rivaroxaban use was associated...