title: Electrophysiological studies in patients with rate-related intermittent left bundle-branch block.
mesh_terms: D002037:Bundle-Branch Block / Q000150:complications / Q000503:physiopathology* / Q000628:therapy; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013610:Tachycardia / Q000150:complications*