AIM: To study the role of 3 days of potassium magnessium aspartate after off-pump coronary artery bypass graft( OPCABG) surgery in preventing postoperative atrial fibrillation( AF). METHODS:One hundred sixty patients undergoing isolated,initial CABG surgery and having sinus rhythm before surgery were alternatively randomized into the study or the control group( n = 80). The patients in the study group received 4 g potassium magnesium aspartate in 250 ml of 5% glucose solution infused intravenously for 3 day...