title: Elective countershock in atrial fibrillation with an intracardiac electrode--a preliminary report.
mesh_terms: D000818:Animals; D001281:Atrial Fibrillation / Q000628:therapy*; D004285:Dogs; D004554:Electric Countershock / Q000295:instrumentation*; D004566:Electrodes; D006801:Humans; D008722:Methods