What’s atrial fibrillation, and why’s your watch telling you about it?

Ars Technica
By John TimmerSep 26, 2018, 10:46 am902 pts
Enlarge / See that irregular up-and-down motion right before the big beat? That's atrial fibrillation. (credit: NASA) What's atrial fibrillation, and why has Apple decided that it's worth screening for it? The first question's much easier to answer, so let's get that out of the way. Your heart has four…

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