Rod Passman, MD highlights a new study on wearables for stroke prevention in patients with atrial fibrillation: the Rhythm Evaluation for AntiCoagulaTion (REACT-AF) trial. Northwestern University and Johns Hopkins University were recently awarded a $37 million grant by the National Heart, Lung, and Blood Institute to conduct this seven-year trial. The study will use Apple Watches and a specially developed app available on iPhones to create personalized care for each patient.