The Apple Watch’s ECG feature could save many lives. But only if it has something else.

Recently the Apple Watch’s latest feature went live – an electrocardiogram (ECG) app that monitors irregular heart rhythms. The internet is overflowing with reports from people didn’t know they had irregular heartbeats until they took their data to their doctors and received diagnoses of atrial fibrillation (AFib), a common cause of stroke.

As neurologists who treat stroke patients, we welcome technology that enables patients to receive faster diagnoses and better treatment. …

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