title: Atrial activity in atrial fibrillation after intravenous verapamil.
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000188:drug therapy* / Q000503:physiopathology; D005260:Female; D006325:Heart Atria / Q000503:physiopathology*; D006339:Heart Rate; D006801:Humans; D007275:Injections, Intravenous; D008297:Male; D008875:Middle Aged; D014700:Verapamil / Q000008:administration & dosage / Q000627:therapeutic use*
chemical_list: D014700:Verapamil