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The main thing they're good at picking up is when your heart flips into an irregular rhythm called atrial fibrillation. The pulse becomes irregularly irregular and they're pretty good at picking a change from a previously regular pulse. Have seen plenty of patients who are prompted to see a doctor because of this. The longer AF is present, the harder it is to get your heart back into a normal rhythm, so early detection is beneficial.
Not sure about the usefulness of the rest of the data they collect.
DT
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