Apple Watch ECG App Arrives Today

Owners of the Apple Watch Series 4 will get a watchOS update to 5.1.2 today, featuring the new ECG app. This app allows the wearer to take an electrocardiogram which can predict possible heart issues.
Owners of older Apple Watches will get a simpler irregular rhythm notification using a series of checks over a 65-minute period of time. But only the latest Apple Watch has the electrodes to do an ECG.