The Apple Watch Series 4 learned a new trick: it can now perform an EKG, or electrocardiogram. It’s a test that can detect heart problems, and it could save lives. But it could also have some unintended side effects: self-diagnosis, false positives, and other headaches for doctors and hospitals everywhere. We took the new EKG feature for a spin, tested it against a hospital-grade machine, and spoke to a doctor about how consumer gadgets could change heart health.

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