Why Doctors Are Concerned About Apple Watch ECG

The Apple Watch Series 4 has learned a new trick: it can now perform an ECG, or electrocardiogram. It's a test that can detect heart problems and could save lives. But it could also have unintended side effects: self-diagnosis, false positives and other headaches for doctors and hospitals around the world. We tried out the new ECG feature, tested it on a hospital-grade device, and spoke with a doctor about how consumer gadgets could change heart health.

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