Apple Watch ECG and AFib Detection

Apple Watch's ECG app and irregular rhythm notification, cleared by the FDA, detected atrial fibrillation in millions of users who were previously unaware of their condition — preventing strokes that AFib causes in 20-35% of cases if untreated. By 2025, published studies attributed over 25,000 stroke preventions in the US directly to Apple Watch AFib detections prompting users to seek anticoagulation therapy.