Assertion: atrial fibrillation | /r/HasProperty | fib
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Source sentences:
text: Atrial fibrillation also referred to as a fib, AFib, A fib, AFIB, AFib and A-fib) is a form of heart disease that causes an irregular and usually rapid heart rhythm that results from abnormal electrical impulses in the upper chambers of the heart (atria) to the AV node.