A few days ago, we told you that it took a last second letter sent by the FDA to Apple to keep the Apple Watch Series 4 from being a no show at the September 12th "Gather round" event. In the letter, the FDA approved the ECG feature on the timepiece. The electrocardiogram can help detect irregular heart rhythms, making it an important personal health tool along with the heart rate monitor on the watch.

There have been some concerns about the ECG on the Apple Watch, because it uses only one lead compared to the 12 leads used on a standard ...


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