Patients' characteristics. Values are numbers of patients (n and % of total) with selected clinical characteristics, except for age and heart rate (mean±SE). ACE, angiotensin converting enzyme; ASD, atrial septal defect; AVR, aortic valve replacement; bpm, beats per min; CABG, coronary artery bypass graft surgery; CCB, calcium channel blocker; f, female; LVSD, left ventricular systolic dysfunction; m, male; MI, myocardial infarction; MVR, mitral valve replacement; post-CS AF, post-cardiac surgery atrial fibrillation; VSD, ventricular septal defect.