title: Atrioventricular conduction defects in patients presenting with syncope and normal PR interval.
mesh_terms: D000368:Aged; D002037:Bundle-Branch Block / Q000175:diagnosis / Q000503:physiopathology; D006328:Cardiac Catheterization; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013575:Syncope / Q000209:etiology*; D014474:Unconsciousness / Q000209:etiology