Cardiac arrhythmia.
D000818:Animals; D001281:Atrial Fibrillation / Q000175:diagnosis / Q000188:drug therapy / Q000662:veterinary*; D004562:Electrocardiography / Q000662:veterinary*; D006734:Horse Diseases / Q000175:diagnosis* / Q000188:drug therapy; D006736:Horses; D008297:Male; D011802:Quinidine / Q000627:therapeutic use
D011802:Quinidine