Objectives: The objective of this study was to describe the effect of successful percutaneous transluminal coronary angioplasty (PTCA) on QT dispersion and to see the changes with restenosis. In addition, we tried to research feasibility of QT and QTc dispersion as a useful noninvasive method to determine restenosis.

Material and Methods: 34 patients who were decided for PTCA after coronary angiography were included in this study. Prior to PTCA, in the first 24 hour after the procedure and at 3 or 6 months interval twelve-lead electrocardiograms (ECG) of every patient at 50 mm/sec were recorded. During follow up period, coronary angiography was applied to 13 patients due to symptoms and stress test results and 9 of these had stenosis and 4 normal coronary arteries.

Results: A significant reduction in QT dispersion (QTd) and corrected QT dispersion (QTcd) in the first 24 hours after PTCA was observed and during the succeeding period mean 4 months (3 to 6) these values didn’t change if there is no restenosis. Developing restenosis caused an important increase in QTd and QTcd values.

Conclusion: Reduction in QTd after PTCA may prevent unwanted events like sudden cardiac death and malignant ventricular arrhythmias. With developing restenosis QT dispersion increases and we think that to follow up after PTCA or to determine restenosis after revascularization QT dispersion may be used as a noninvasive method. ©2007, Firat University, Medical Faculty