title: Disappearance of bundle branch block with slowing of normal heart rate.
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000188:drug therapy / Q000503:physiopathology; D001285:Atropine / Q000627:therapeutic use; D002037:Bundle-Branch Block / Q000503:physiopathology* / Q000628:therapy; D004562:Electrocardiography; D006339:Heart Rate; D006801:Humans; D008297:Male; D008468:Meclizine / Q000627:therapeutic use; D010138:Pacemaker, Artificial; D011802:Quinidine / Q000627:therapeutic use; D014717:Vertigo / Q000188:drug therapy
chemical_list: D008468:Meclizine; D001285:Atropine; D011802:Quinidine