Direct current countershock: long term follow-up.
D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000628:therapy*; D001282:Atrial Flutter / Q000628:therapy*; D004554:Electric Countershock; D006801:Humans; D008875:Middle Aged; D013610:Tachycardia / Q000628:therapy*