Assertion: atrial fibrillation's heart rhythm | /r/Synonym | atrial fibrillation
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Source sentences:
text: The FDA has approved Janssen's Xarelto to prevent stroke in patients with an abnormal heart rhythm called atrial fibrillation -- with a strong "black box" warning.
text: This kind of stroke is usually seen in patients with an abnormal heart rhythm called atrial fibrillation.