Natural history of pacemaker patients.
D000328:Adult; D000367:Age Factors; D000368:Aged; D004566:Electrodes; D006327:Heart Block / Q000401:mortality / Q000628:therapy*; D006333:Heart Failure / Q000209:etiology; D006801:Humans; D008875:Middle Aged; D010138:Pacemaker, Artificial; D005082:Physical Exertion; D013997:Time Factors