Apple Watch ECG and AFib Detection

The Apple Watch's FDA-cleared ECG app detected atrial fibrillation in millions of unaware users, preventing strokes that cause 20-35% of cases if left untreated. By 2025, studies attributed over 25,000 stroke preventions in the US directly to these detections, with users seeking anticoagulation therapy 50% faster than the typical diagnosis timeline. This preventive impact is 3x more cost-effective per intervention than #5 AI mental health chatbots' CBT delivery, achieving $4,500 savings per stroke avoided compared to $1,200 per depression episode managed. With 98% specificity in AFib identification, the Apple Watch remains the most widely adopted wearable for proactive cardiac care.