Assertion: atrial fibrillation | /r/CapableOf | describe twitching
Facets:
Source sentences:
text: Atrial fibrillation describes very rapid contractions, or ‘twitching’, of the heart muscle, confined to the
text: Atrial fibrillation describes very rapid contractions, or ‘twitching’, of the heart muscle, confined to the atria, or the top chambers of the heart.