The relationship between the low HRV at 7 days postop and the atrial fibrillation follow up 17 7 days postop AF Low HRV (n=110) OR 95% (CI) p Yes No 3 months postop (n,%) Yes 9 (75, 00) 3 (25, 00) 3, 13 0, 81 - 12, 51 >0, 05 No 48 (48, 98) 50 (51, 02) 6 months postop (n,%) Yes 10 (62, 50) 6 (37, 50) 1, 67 0, 57 - 5, 07 >0, 05 No 47 (49, 50) 47 (50, 50) 3.3.3.2.