Electrocardiography (ECG or EKG from Greek: kardia, meaning heart) is a transthoracic (across the thorax or chest) interpretation of the electrical activity of the heart over a period of time, as detected by electrodes attached to the surface of the skin and recorded by a device external to the body. The recording produced by this noninvasive procedure is termed an electrocardiogram (also ECG or EKG).
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Apple Watch 4's ECG heart monitor feature is live, here's how to use it
The Apple Watch Series 4's ECG feature can detect issues with how the user's heart is functioning. It is now live for users ...