The Apple Watch can now tell if you have an irregular heart rhythm. A new software update was released Thursday for the Apple Watch Series 4. It includes a feature that can monitor heart rhythms, and identify a common form of irregular heart rhythm. Apple Watch users can take a reading of their heart's electrical signal by holding a finger on the crown of the watch. Anyone over age 22 can use the new feature. Federal regulators cleared Apple for its electrocardiogram app in September after it conducted a study.
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