Assertion: atrial fibrillation | /r/HasProperty | confirmed by electrocardiogram
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Source sentences:
text: These numbers, from the Mayo Clinic, only reflect those with atrial fibrillation confirmed by an electrocardiogram, and don't include many more with symptoms but who cannot be confirmed.
text: The diagnosis is then confirmed with an electrocardiogram (EKG), which takes readings of the electrical activity of the heart.