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What is atrial fibrillation (AFib)?

Atrial fibrillation (AFib) is defined as an irregular heart rate (usually more rapid than normal) that can lead to increased risk of heart failure, stroke, and numerous other heart-related diseases. The condition is caused by the heart’s atria (the parts of the heart that receive blood from the veins) beating out of sync with the ventricles (the parts of the heart that push blood back out into the body). Symptoms of atrial fibrillation include heart palpitations (feeling that your heart is racing, pounding, or fluttering), weakness, and shortness of breath.

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