title: Paroxysmal atrial rate-related heart block.
mesh_terms: D004562:Electrocardiography; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000209:etiology* / Q000503:physiopathology; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged