Irregular heartbeats or abnormal rhythms of the heart where it beats too fast, too slow, or irregularly.
From Greek 'a-' (without) + 'rhythmos' (rhythm). Medical Latin adopted this term in the 19th century to describe cardiac conditions characterized by loss of normal rhythmic beating.
Atrial fibrillation, one of the most common arrhythmias, affects millions of people—the heart's upper chambers quiver chaotically, and one risk is blood pooling and forming clots that could cause strokes.
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