Tehran University of Medical Sciences The Research in Heart Yield and Translational Medicine (RHYTHM) 3115-7270 16 1 2021 01 14 20 25 Hilal Erken Pamukcu Dışkapı Yıldırım Beyazıt Training and Research Hospital, University of Health Sciences, Ankara, Turkey. Veysel Ozan Tanık Dışkapı Yıldırım Beyazıt Training and Research Hospital, University of Health Sciences, Ankara, Turkey. Barış Şimşek Dr. Siyami Ersek Thoracic and Cardiovascular Surgery Training and Research Hospital, İstanbul, Turkey. İbrahim Hakan Güllü Dışkapı Yıldırım Beyazıt Training and Research Hospital, University of Health Sciences, Ankara, Turkey. 2020 08 13 2021 05 05 Background: Atrial fibrillation (AF) is associated with increased morbidity in myocardial infarction (MI), especially thromboembolic risk increases. The PRECISE-DAPT (The PREdicting bleeding Complications In patients undergoing Stent implantation and subsEquent Dual Anti-Platelet Therapy) score was created to predict the bleeding risk of dual antiplatelet therapy. The purpose of this study was to evaluate the association between new-onset AF and the PRECISE-DAPT score in ST-segment-elevation myocardial infarction (STEMI). Methods: This retrospective study enrolled patients who developed STEMI within 12 hours of the onset of symptoms and underwent primary percutaneous coronary intervention. The study population was divided into 2 groups of PRECISE-DAPT scores of 25 or greater and PRECISE-DAPT scores of below 25 and their baseline characteristics, as well as laboratory and echocardiography results, were compared. In-hospital new AF and related events were compared between the 2 PRECISE-DAPT score groups. Results: From February 2015 to December 2017, this study enrolled 2234 patients with STEMI at a mean age of 54.4 years. The new-onset AF incidence rate was higher in the higher PRECISE-DAPT group than in the lower PRECISE-DAPT group (62 [28.7 %] vs 58 [2.9%]; P<0.001). According to the multivariate logistic regression analysis, the factors associated with new-onset AF were the left atrial diameter (OR =1.98, 95% confidence interval= 1.34–2.93; P=0.001) and the PRECISE-DAPT score (OR =1.04, 95% confidence interval= 1.10–1.18; P<0.001). Conclusion: The PRECISE-DAPT score was associated with the development of new-onset AF in our patients with STEMI. Further follow-up of these patients will provide clearer information. https://jthc.tums.ac.ir/index.php/jthc/article/view/1332 https://jthc.tums.ac.ir/index.php/jthc/article/download/1332/948