Relation between Index of CardiacElectrophysiological Balance and Tp-e/QT ratio and collateral circulation

Aim: Index of cardiac electrophysiological balance (iCEB), calculated as QT interval / QRS duration, has been described as a novel indicator for predicting malignant ventricular arrhythmias. Herein, we aimed to explore the relation of coronary collateral circulation (CCC) degree with iCEB and Tp-e / QT ratio.

Patients and Methods: Forty-four patients diagnosed with chronic total occlusion (CTO) and 55 healthy subjects in comparable age and sex distribution were included. We classified the CTO patients as good (n= 24) and poor (n= 20) collateral groups. Standard 12-lead standard electrocardiogram (ECG) of all patients was recorded and Tp-Te interval, QT interval, QRS duration, Tp-Te/QT ratio and QT/QRS ratio were measured.

Results: Mean Tp-e interval and Tp-e/QT ratio were similar between groups. Also, the groups were comparable regarding iCEB or iCEBc values. In subgroup analysis, there was no relationship between the degree of CCC and ECG parameters including Tp-e/QT ratio, Tp-e and QT/QRS ratio.

Conclusion: There was no significant relationship between the iCEB and Tp-e/QT ratio, and the degree of CCC development in patients having CTO.