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SUMMARY OBJECTIVE: Inflammation plays a key role in the pathogenesis of postoperative atrial fibrillation after coronary artery bypass graft surgery. In this study, we aimed to investigate the changes in mean platelet volume and platelet values during the spring and autumn seasons in patients who underwent isolated coronary artery bypass graft surgery and the possible effect of these occurrences on postoperative atrial fibrillation. METHODS: Consecutive patients who underwent elective isolated coronary bypass surgery at our clinic in the spring and autumn months, between August 2020 and July 2022, were retrospectively included in this study. Variables were evaluated according to the spring and autumn seasons. Patients who did not develop in-hospital postoperative atrial fibrillation were identified as Group 1, and those who did constituted Group 2. RESULTS: A total of 622 patients were included in the study. The patients were divided into two groups: those who were operated on in the spring (n=277, median age=62 years, male gender ratio=77.3%) and those who were operated on in the autumn (n=345, median age=61 years, male gender ratio=81.4%). There was no statistically significant difference between the patients operated on in both seasons in terms of age, gender, hypertension rates, and the frequency of chronic obstructive pulmonary disease. In multivariate analysis, being over 70 years old (OR: 1.934, 95% confidence interval (CI) 1.489–2.995, p<0.001), having a left ventricular ejection fraction below 30% (OR: 1.550, 95%CI 1.190–2.236, p=0.012), and having chronic obstructive pulmonary disease (OR: 1.663, 95%CI 1.339–2.191, p<0.001) were found to be independent predictors in predicting the development of postoperative atrial fibrillation. CONCLUSION: In this study, we first demonstrated that mean platelet volume and platelet mass index values were higher in patients in the autumn months. Additionally, for the first time in the literature, we showed that there is a significant relationship between platelet mass index value and the development of postoperative atrial fibrillation in patients who underwent isolated coronary artery bypass graft. OBJECTIVE study METHODS months 202 2022 inhospital hospital 1 2 RESULTS 62 groups n=277, n277 n 277 (n=277 age62 age age=6 ratio=77.3% ratio773 ratio 77 3 n=345, n345 345 (n=345 age61 61 ratio=81.4%. ratio814 ratio=81.4% . 81 4 ratio=81.4%) rates analysis 7 OR (OR 1934 934 1.934 95 CI (CI 14892995 489 995 1.489–2.995 p<0.001, p0001 p p<0.001 , 0 001 30 1550 550 1.550 95CI 11902236 190 236 1.190–2.236 p=0.012, p0012 p=0.012 012 p=0.012) 1663 663 1.663 13392191 339 191 1.339–2.191 CONCLUSION Additionally literature 20 6 n=277 n27 27 (n=27 age6 age= ratio=77.3 ratio77 n=345 n34 34 (n=34 ratio81 ratio=81.4 8 193 93 1.93 9 1489299 48 99 1.489–2.99 p000 p<0.00 00 155 55 1.55 1190223 19 23 1.190–2.23 p001 p=0.01 01 166 66 1.66 1339219 33 1.339–2.19 n=27 n2 (n=2 ratio=77. ratio7 n=34 n3 (n=3 ratio8 ratio=81. 1.9 148929 1.489–2.9 p00 p<0.0 15 5 1.5 119022 1.190–2.2 p=0.0 16 1.6 133921 1.339–2.1 n=2 (n= ratio=77 n=3 ratio=81 1. 14892 1.489–2. p0 p<0. 11902 1.190–2. p=0. 13392 1.339–2. n= (n ratio=7 ratio=8 1489 1.489–2 p<0 1190 1.190–2 p=0 1339 1.339–2 ratio= 148 1.489– p< 119 1.190– p= 133 1.339– 14 1.489 11 1.190 13 1.339 1.48 1.19 1.33 1.4 1.1 1.3