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Definition of Atrial fibrillation
1. Noun. Fibrillation of the muscles of the atria of the heart.
Definition of Atrial fibrillation
1. Noun. A cardiac arrhythmia (abnormal heart rhythm) that involves the two upper chambers (atria) of the heart. ¹
¹ Source: wiktionary.com
Medical Definition of Atrial fibrillation
1.