Assertion: atrial fibrillation's heart rhythm | /r/CapableOf | start in heart's upper chambers
Facets:
Source sentences:
text: Atrial fibrillation ablation is a procedure used to treat an irregular heart rhythm (arrhythmia) that starts in the heart's upper chambers (atria).
text: Atrial fibrillation ablation is a procedure used to treat an irregular heart rhythm (arrhythmia) that starts in the heart's upper chambers (atria).