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Apple Watch Afib data discrepancy?

Heart Rhythm Conditions | Last Active: Mar 2 3:18pm | Replies (13)

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Interesting discussion. I wear an Apple Watch and a Fitbit. Both devices track my AFib, but my research indicates the Apple Watch has a better algorithm. Last night and this morning (28 Feb-1 Mar) my Fitbit recorded some significant AFib events, but for the first time in nearly 3 years, my Apple Watch recorded no events. Apple Watch was fully charged at bedtime. I have AFib History enabled on the Apple Watch and have been getting regular updates.

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Replies to "Interesting discussion. I wear an Apple Watch and a Fitbit. Both devices track my AFib, but..."

@stryker66 I hope I don't come across as callous or dismissive....not my intent. We don't know each other, I don't know your history, and I'm no health expert...not by any means. Just taking what you have 'said' at face value, and mixing it with what I have learned (mostly for and about myself), humans tend to be biased toward information that appears to support or to confirm what they WISH TO believe....what they HOPE is true. This is widely known as 'confirmation bias'. I think, without knowing much about the two devices, that there is some danger here for you in assuming the 'better news' is correct. It may very well be that you are correct, and that the Apple watch is better, but remember that the FDA or whomever has approved BOTH devices for sale and with active apps that measure health passably accurately, enough that they are meant to inform. But different devices sit on the wrist differently due to differences in engineering and in form factor. Maybe one of their bands feels better for you when it's a bit tighter, and when it therefore gets better information, than the other. But which is it....which one....and how can you tell?

Not trying to rain on your parade. I would hope, for your sake, that the Apple IS the better of the two. But you can't be sure without some other measure that confirms it. Maybe, if you're up to the experiment and the relatively modest outlay of cash, a Kardia mobile or some other worn device would allow you to do that....confirm.