The relationship between the HRV preop with postoperative atrial fibrillation preop AF Low HRV OR 95% (CI) p Yes No 7 days postop (n=117; n,%) Yes 8 (50, 00) 8 (50, 00) 3, 0 4 1, 03 - 8, 94 <0, 05 No 25 (24, 80) 76 (75, 20) 3 months postop (n=116; n,%) Yes 9 (56, 20) 7 (43, 80) 4, 3 0 1, 44 - 12, 82 <0, 05 No 23 (23, 00) 77 (77, 00) 6 months postop (n=116; n,%) Yes 9 (45, 00) 11 (55, 00) 2, 6 0 0, 96 - 7, 04 >0, 05 No 23 (24) 73 (76) Table 3.41.