The relationship between QT dispersion, fragmented QRS, and collateral circulation in patients with chronic total coronary artery occlusion

Aims: Corrected QT dispersion (QTcD), prolonged QT dispersion (QTD), and fragmented QRS (fQRS) are known as indicators of high risk for cardiac arrhythmias. Within this context, our research was conducted to assess the role of coronary collateral circulation (CCC) on QTD and fQRS in participants with chronic total coronary artery occlusion. Methods: This study examined 131 participants with CCC in total. The participants were divided into two groups based on the Rentrop classification: group 1 (Rentrop 0 and 1) and group 2 (rentrop 2 and 3). Demographic data, laboratory results, and electrocardiogram findings were analyzed retrospectively. Results: Significantly, variability was observed between the poor and good collateral groups in terms of QTcD (91.3±21.6 vs 57.2±26.2, p