Updated: What you need to know about technology for serious health tracking

Heart rate monitors are part and parcel of smartwatches and fitness trackers now, but electrocardiogram (ECG/EKG) is the new sensor in town.

The technology is designed to help people keep closer tabs on their heart health, and can even be used to help identify atrial fibrillation (Afib) a serious medical condition that is a leading cause of stroke.
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