title: Reversion of chronic atrial fibrillation.
mesh_terms: D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000209:etiology / Q000628:therapy*; D004554:Electric Countershock; D005500:Follow-Up Studies; D006333:Heart Failure / Q000150:complications; D006801:Humans; D008875:Middle Aged; D011342:Procainamide / Q000627:therapeutic use; D011802:Quinidine / Q000009:adverse effects / Q000627:therapeutic use; D014693:Ventricular Fibrillation / Q000209:etiology
chemical_list: D011802:Quinidine; D011342:Procainamide