title: Verapamil versus placebo in atrial fibrillation and atrial flutter.
mesh_terms: D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000188:drug therapy*; D001282:Atrial Flutter / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D006801:Humans; D008297:Male; D008875:Middle Aged; D010919:Placebos / Q000627:therapeutic use*; D014700:Verapamil / Q000627:therapeutic use*
chemical_list: D010919:Placebos; D014700:Verapamil