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Continuing research by Stanford and Apple from the 2017 Apple Heart Study, which managed to enrol over 400,000 participants and became one of the largest studies of its kind ever performed, has shown that the Apple Watch is capable of detecting other types of arrhythmic heart beat irregularities in addition to atrial fibrillation (AFib). Apple Watch currently offers potential atrial fibrillation detection and notifications as one of its core health features, introducing it to the device with its Series 4 update which added an electrocardiogram (ECG) sensor.
