Permanent transvenous demand pacing of the heart.
D000368:Aged; D004562:Electrocardiography; D004566:Electrodes; D005260:Female; D005500:Follow-Up Studies; D006321:Heart / Q000000981:diagnostic imaging; D006327:Heart Block / Q000628:therapy*; D006333:Heart Failure / Q000209:etiology; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D010138:Pacemaker, Artificial; D011183:Postoperative Complications; D011859:Radiography; D013575:Syncope / Q000628:therapy