Pediatrics and Congenital Heart Disease (CHD)
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This website is in partnership with the Pediatric & Congenital Electrophysiology Society (PACES).
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Atrial fibrillation (AFib) is the most common abnormal heart rhythm. In a normal heart, the four chambers of the heart beat in a steady, rhythmic pattern. With AFib, the atria (upper chambers of the heart) fibrillate (quiver or twitch quickly) and create an irregular rhythm.