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Background: In animal studies, atrial fibrillation has been shown to shorten the atrial refractory period and impair its rate adaptation. However, little is known about the effects of chronic atrial fibrillation on atrial electrophysiology and its recovery course in humans. Methods and results: Nineteen patients, mean age 64+/-14 years, with chronic atrial fibrillation of more than six months duration...
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