title: Demand pacemaker malfunction due to abnormal sensing. Report of two cases.
mesh_terms: D000368:Aged; D002037:Bundle-Branch Block / Q000628:therapy; D004558:Electric Stimulation; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000628:therapy; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000628:therapy; D010138:Pacemaker, Artificial