I’m really skeptical of the articles on the accuracy of the ECG function of the new Apple Watch. Most don’t quote anything from Apple and don’t seem to understand the Apple Watch Heart study.

Apple has 2 clearances from the FDA:
One for using the pulse tracking (not ECG) on any Series 1 watch or newer to detect AFib:

The other is for the ECG feature:

The Apple Heart Study is for the pulse detection, plus when AF is suspected a continuous ecg monitor is given to the patient for 8 days, this is NOT the Series 4, it’s a continuous monitoring device separate from the Watch:

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