Tehran University of Medical Sciences The Research in Heart Yield and Translational Medicine (RHYTHM) 3115-7270 13 4 2018 10 15 Relationship between Vitamin D Levels and the Incidence of Post Coronary Artery Bypass Graft Surgery Atrial Fibrillation 159 165 EN Maryam Daie Department of Clinical Pharmacy, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran. Azita Hajhossein Talasaz Department of Clinical Pharmacy, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran. AND Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran. Abbasali Karimi Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran. Kheirollah Gholami Department of Clinical Pharmacy, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran. Abbas Salehiomran Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran. Hamid Ariannejad Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran. Arash Jalali Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran. 2018 01 01 2018 08 26 Background: Postoperative atrial fibrillation (POAF) is probably a consequence of inflammation. Vitamin D is known for its anti-inflammatory properties. The aim of this study was to evaluate the effects of vitamin D levels on the incidence of POAF. Methods: In a prospective cohort study, patients were monitored for the occurrence of POAF during the first 5 days after coronary artery bypass grafting surgery in Tehran Heart Center. Those with concomitant valvular surgeries were excluded. Thereafter, they were divided into 2 groups: with or without POAF. Vitamin D levels were assessed in all the patients. The relationship between the vitamin D level and the incidence of POAF was evaluated and compared between the groups using the Mann–Whitney U test. Results: The study population comprised of 156 patients. The mean age was 62.8±8.6 years, and 105 (67.3%) patients were male. Of the 156 patients, 29 (19%) developed POAF. The median preoperative vitamin D level was 15.3 in the group with POAF and 25.3 in the group without POAF (P=0.07). Conclusion: Our results demonstrated no significant relationship between vitamin D levels and the occurrence of POAF. https://rhythm.tums.ac.ir/index.php/jthc/article/view/831 https://rhythm.tums.ac.ir/index.php/jthc/article/download/831/799