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Abstract Introduction: Rhythm problems are the most observed complications following coronary artery bypass grafting (CABG), the most common being postoperative atrial fibrillation (PoAF), with an incidence reaching 50% of the patients. In this study, we aimed to investigate the predictive importance of prognostic nutritional index (PNI) and visceral adiposity index (VAI) in predicting PoAF, which occurs after CABG accompanied by cardiopulmonary bypass. Methods: Patients who underwent isolated CABG with cardiopulmonary bypass between June 15 and October 15, 2019, were prospectively included in the study. Patients who did not develop in-hospital PoAF were identified as Group 1, and those who did constituted Group 2. Results: PoAF developed in 55 (27.6%) patients (Group 2). The mean age of the 144 patients included in Group 1 and 55 patients in Group 2 were 56.9±8.7 and 64.3±10.2 years, respectively (P<0.001). In multivariate analysis Model 1, age (odds ratio [OR]: 1.084, confidence interval [CI]: 1.010-1.176, P=0.009), chronic obstructive pulmonary disease (OR: 0.798, CI: 0.664-0.928, P=0.048), and PNI (OR: 1.052, CI: 1.015-1.379, P=0.011) were determined as independent predictors for PoAF. In Model 2, age (OR: 1.078, CI: 1.008-1.194, P=0.012), lymphocyte counts (OR: 0.412, CI: 0.374-0.778, P=0.032), and VAI (OR: 1.516, CI: 1.314-2.154, P<0.001) were determined as independent predictors for PoAF. Conclusion: In this study, we determined that low PNI, a simply calculable and cheap parameter, along with high VAI were risk factors for PoAF. Introduction CABG, , (CABG) (PoAF) 50 study (PNI (VAI Methods 2019 inhospital hospital Results 5 27.6% 276 27 6 (27.6% . 2) 14 56987 56 9 8 7 56.9±8. 643102 64 3 10 64.3±10. years P<0.001. P0001 P P<0.001 0 001 (P<0.001) odds OR [OR] 1084 084 1.084 CI [CI] 1.0101.176, 10101176 1.010 1.176, 010 176 1.010-1.176 P=0.009, P0009 P=0.009 009 P=0.009) (OR 0798 798 0.798 0.6640.928, 06640928 0.664 0.928, 664 928 0.664-0.928 P=0.048, P0048 P=0.048 048 P=0.048) 1052 052 1.052 1.0151.379, 10151379 1.015 1.379, 015 379 1.015-1.379 P=0.011 P0011 011 1078 078 1.078 1.0081.194, 10081194 1.008 1.194, 008 194 1.008-1.194 P=0.012, P0012 P=0.012 012 P=0.012) 0412 412 0.412 0.3740.778, 03740778 0.374 0.778, 374 778 0.374-0.778 P=0.032, P0032 P=0.032 032 P=0.032) 1516 516 1.516 1.3142.154, 13142154 1.314 2.154, 314 154 1.314-2.154 Conclusion parameter (CABG (PoAF 201 27.6 (27.6 5698 56.9±8 64310 64.3±10 P000 P<0.00 00 (P<0.001 [OR 108 08 1.08 [CI 0101 1.0101.176 1010117 1010 1.01 1176 1.176 01 17 1.010-1.17 P=0.00 079 79 0.79 6640 0.6640.928 0664092 0664 0.66 0928 0.928 66 92 0.664-0.92 P004 P=0.04 04 105 05 1.05 0151 1.0151.379 1015137 1015 1379 1.379 37 1.015-1.37 P=0.01 P001 107 07 1.07 0081 1.0081.194 1008119 1008 1.00 1194 1.194 19 1.008-1.19 041 41 0.41 3740 0.3740.778 0374077 0374 0.37 0778 0.778 77 0.374-0.77 P003 P=0.03 03 151 51 1.51 3142 1.3142.154 1314215 1314 1.31 2154 2.154 31 1.314-2.15 20 27. (27. 569 56.9± 6431 64.3±1 P00 P<0.0 (P<0.00 1.0 1.0101.17 101011 101 117 1.17 1.010-1.1 P=0.0 0.7 0.6640.92 066409 066 0.6 092 0.92 0.664-0.9 1.0151.37 101513 137 1.37 1.015-1.3 1.0081.19 100811 100 119 1.19 1.008-1.1 4 0.4 0.3740.77 037407 037 0.3 077 0.77 0.374-0.7 1.5 1.3142.15 131421 131 1.3 215 2.15 1.314-2.1 (27 56.9 643 64.3± P0 P<0. (P<0.0 1. 1.0101.1 10101 11 1.1 1.010-1. P=0. 0. 0.6640.9 06640 06 09 0.9 0.664-0. 1.0151.3 10151 13 1.015-1. 1.0081.1 10081 1.008-1. 0.3740.7 03740 0.374-0. 1.3142.1 13142 21 2.1 1.314-2. (2 56. 64.3 P<0 (P<0. 1.0101. 1.010-1 P=0 0.6640. 0.664-0 1.0151. 1.015-1 1.0081. 1.008-1 0.3740. 0.374-0 1.3142. 1.314-2 ( 64. P< (P<0 1.0101 1.010- P= 0.6640 0.664- 1.0151 1.015- 1.0081 1.008- 0.3740 0.374- 1.3142 1.314- (P< (P