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A 69-year-old male visited our clinic in 1973 because of atrial fibrillation noted during an annual check-up for the aged. Blood pressure, heart rate and CTR in chest X-ray films showed 110/80 mmHg, 150/min and 55%, respectively. There were no signs of valvular heart diseases, and a diagnosis of lone atrial fibrillation was convincing. Since then, repeated ECGs recorded twice or more a year had shown atrial fibrillation until 1988, when sinus rhythm with both first degree AV block and low P-wave amplitude appeared. The motion pattern of the anterior mitral leaflet on M mode echocardiography was abnormal with almost complete disappearance of the A-wave, whereas the motion pattern of the tricuspid valve was normal.

Spontaneous Reversion to Sinus Rhythm in a Case of Lone Atrial Fibrillation of Fifteen Years Duration.