title: Intermittent intra-atrial block: its diagnosis, incidence and implications.
mesh_terms: D000328:Adult; D000368:Aged; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000175:diagnosis / Q000453:epidemiology / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis