Pacemaker mediated endless loop tachycardia.
D000368:Aged; D004868:Equipment Failure; D006327:Heart Block / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D013610:Tachycardia / Q000209:etiology* / Q000517:prevention & control