title: First degree heart block after DC countershock.
mesh_terms: D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000628:therapy; D001282:Atrial Flutter / Q000628:therapy; D004554:Electric Countershock / Q000009:adverse effects*; D005260:Female; D006323:Heart Arrest / Q000209:etiology; D006327:Heart Block / Q000209:etiology*; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged