Atrial Fibrillation Definition

noun
Fibrillation in which the normal rhythmical contractions of the cardiac atria are replaced by rapid irregular twitchings of the muscular wall that cause the ventricles to respond irregularly.
American Heritage Medicine

A cardiac arrhythmia (abnormal heart rhythm) that involves the two upper chambers (atria) of the heart.

Wiktionary

Other Word Forms of Atrial Fibrillation

Noun

Singular:
atrial fibrillation
Plural:
atrial-fibrillations

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