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Atrial fibrillation describes an irregular and often rapid heart rhythm. Atrial fibrillation is a disorder found in about 2.2 million Americans. Atrial fibrillation is the most common arrhythmia; risk increases with age, with 8% of people over 80 having AF. During atrial fibrillation, the heart’s two small upper chambers (the atria) quiver instead of beating effectively. Atrial fibrillation is often caused by changes in your heart that occur as a result of heart disease or high …