ABSTRACT\nAim: The aim of this study is to demonstrate the association of cardiac arrest with the abnormal yawning developed in patients treated with primary percutaneous coronary intervention with ST segment elevation myocardial infarction.\nMethods:This prospective study included 125 consecutive patients diagnosed with ST segment elevation myocardial infarction between July 2014 and February 2016 who were admitted to the catheter laboratory by the same cardiologist and the patients were divided into two groups with and without abnormal yawning.\nResults :Considering the whole cohort, mean age of patients was 60±12years (79% male, 21% female). Abnormal yawning was observed in 20 (16%) patients. The development of cardiac arrest was statistically significantly higher in patients with abnormal yawning than in patients without yawning (16 (80%) vs 9 (9%), p< 0.001) In multible logistic regression model with forward stepwise method, abnormal yawning (OR: 154.86, p<0.001, B: 5.043) remained independently associated with an increased risk of cardiac arrest after adjustment for variables found to be statistically significant in univariate analysis and associate with abnormal yawning. In the ROC curve analysis, it has been shown that abnormal yawning predicting cardiac arrest with 96% specificity and 64% sensitivity\n Conclusion: In this study, we demonstrated abnormal yawning, which arises independent of the environment and emotional conditions during primer percutaneous coronary intervention may be a cardiac arrest predictor in ST segment elevation myocardial infarction patients. \n\nKeywords:ST segment elevation myocardial infarction, abnormal yawning, cardiac arrest

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