Background: Slow coronary flow (SCF) is an angiographic finding characterized with delayed opacification of epicardial coronary arteries without obstructive coronary artery disease, coronary artery ectasia, or myocardial dysfunction. SCF is associated with repeat coronary angiography due to recurrent angina, malignant arrhythmias and even sudden cardiac death. Index of cardiac electrophysiological balance (iCEB) (QT/QRS) has been described as a novel predictor of malignant ventricular arrhythmias. The aim of this study is to evaluate the İCEB values in patients with SCF.\nMaterial and Methods: Forty SCF patients and 40 controls were enrolled to the study. Coronary flow rates of all participants were documented by TIMI frame count. First; QRS, QT, Tp-e values were measured manually and QTc interval was calculated by using Bazett\'s formula. Then, Tp-e/QT, QT/QRS and cQT/QRS ratios were calculated.\nResults: There was no significant statistical difference between the two groups in terms of basic demographic characters. QTc and Tp-e intervals, QT/QRS and Tp-e/QT ratios were significantly higher in SCF patients (P<0.05).\nConclusions: This study revealed that iCEB and transmural dispersion of repolarization indices were significantly increased in SCF patients. \nKeywords: Slow coronary flow, Cardiac electrophysiological balance (iCEB), Tp-e interval, Tp-e/QT ratio

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