Problems with pacemakers,.
D000368:Aged; D004562:Electrocardiography; D006327:Heart Block / Q000628:therapy; D006339:Heart Rate; D006801:Humans; D010138:Pacemaker, Artificial / Q000145:classification; D011674:Pulse; D013902:Radiography, Thoracic; D012848:Sinoatrial Block / Q000628:therapy; D013610:Tachycardia / Q000628:therapy