Atrial fibrillation by 24-hour ECG Holter Time Arrhythmias preop (1) (n=119) 7 days postop (2) (n=117) 3 months postop (3) (n=116) 6 months postop (4) (n=116) Atrial fibrillation (n,%) Yes 0 (0) 16 (13, 70) 16 (13, 80) 20 (17, 20) No 119 (100) 101 (86, 30) 100 (86, 20) 96 (82, 80) p p (2 - 3) > 0, 05 p (2 - 4) > 0, 05 Table 3.14.