iPhone Life - Best Apps, Top Tips, Great Gear

The ECG Apple Watch feature can be used to read your heart's rhythm and detect any irregularities that might indicate atrial fibrillation (AFib) while letting you take note of any additional symptoms you want to record. To use the ECG app, your Apple Watch Series 4 with watchOS 5.1.2 or later needs to be paired with iPhone 5s or later with iOS 12.1.1 or later.