Karahan, Mehmet ZülkifAktan, AdemGüzel, TuncayGünlü, SerhatKılıç, Raif2023-07-252023-07-252023https://doi.org/10.1016/j.jelectrocard.2023.01.008https://pubmed.ncbi.nlm.nih.gov/36753857/https://www.scopus.com/record/display.uri?eid=2-s2.0-85147801286&origin=resultslist&sort=plf-f&src=s&sid=616e213f336af904700a91745c86c5ce&sot=b&sdt=b&s=DOI%2810.1016%2Fj.jelectrocard.2023.01.008%29&sl=39&sessionSearchId=616e213f336af904700a91745c86c5cehttps://hdl.handle.net/20.500.12514/3530Introduction: Ischemia due to microvascular dysfunction may be responsible for the heterogeneity of ventricular repolarization in coronary slow flow. To our knowledge, there is no study in which QT interval, Tp-Te interval, index of cardiac-electrophysiological balance (iCEB), and frontal QRS-T angle were evaluated together in patients with CSF. In this study, we examined for the first time the relationship between all these myocardial repolarization parameters and CSF. Materials and methods: The study group included 178 patients (99 female, mean age: 50.6 ± 8.6 years) with isolated CSF without stenotic lesions and with angiographically proven normal coronary arteries. The control group included 120 patients (71 female, mean age: 49.3 ± 9.4 years) with normal coronary angiography. QRS duration, QT interval, QTc interval, Tp-Te interval, Tp-Te/QT, Tp- Te/QTc, iCEB score, and frontal QRS-T angle were calculated from 12‑lead ECGs. Results: There was no significant difference in demographic parameters between the two groups. Compared with the control group, patients with CSF had significantly longer QTmax duration, QT dispersion, Tp-Te interval, and higher iCEB score, wider frontal QRS-T angle. Conclusion: In our study, we found that many of the ventricular repolarization parameters were adversely affected in patients with CSF. Impaired parameters may be associated with the risk of malignant ventricular arrhythmias.en10.1016/j.jelectrocard.2023.01.008info:eu-repo/semantics/closedAccessCoronary slow flowVentricular repolarizationElectrocardiographyArticle7839432-s2.0-8514780128636753857