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Eighty-three patients whose atrial fibrillation appeared to be permanent and the sole cardiac abnormality at the time of diagnosis were followed for one to 19 years (mean 7.5 years). None suffered systemic embolism. Three died, none of cardiac disease. Sinus rhythm returned in seven. Another six developed features suggestive of other heart disease. In the remaining 67, the initial diagnosis of persistent lone atrial fibrillation remained tenable and they remained well.
The medium-term prognosis for patients with this disorder seems good.