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特許 係属中 Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm characterized by rapid and irregular beating.[1] Often it starts as brief periods of abnormal beating which become longer and possibly constant over time.[2] Most episodes have no symptoms.[3] Occasionally there may be heart palpitations, fainting, shortness of breath, or chest pain.[4] The disease increases the risk of heart failure, dementia, and stroke.
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