Will Left Bundle Branch Block affect AFib detection?

I need a watch that can monitor my heart for AFib (I have never had AFib, as far as I know).

But my heart also has Left Bundle Branch Block condition, so my EKG/ECG always come back abnormal.

Does anyone know if the Apple watch would be able to sense if I had an AFib episode?

Posted on Mar 28, 2021 6:19 PM

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2 replies

Mar 29, 2021 2:42 PM in response to IdreamOfJeanne2

Hi there IdreamOfJeanne2,


Thanks for asking about the ECG feature.


Check here for availability in your region: ECG.

ECG requires the following software:

  • The iPhone must have iOS 12.1.1 or later installed.
  • The Apple Watch must have watchOS 5.1.2 or later installed.


For additional help with the ECG feature on your Apple Watch, take a look at these articles:


Heart health notifications on your Apple Watch - Apple Support


Taking an ECG with the ECG app on Apple Watch Series 4, Series 5, or Series 6 - Apple Support


If you have any other questions please reach out to our team at https://apple.co/HeartFeatures. If you believe that you are experiencing a medical emergency, please dial your local emergency services.


Take care.

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Will Left Bundle Branch Block affect AFib detection?

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