Ventricular Repolarization Dispersion During Ischemia Course Measured by Temporal and Spatial Electrocardiographic Parameters

In this work we studied the evolution of increased ven-tricular repolarization dispersion (VRD) in the ECG dur-ing ischemia induced by Percutaneous Transluminal Coro-nary Angioplasty (PTCA). T-wave duration is measured by an automatic delineator and proposed as a index to quan-tify increased VRD. Moreover, spatial complexity of repo-larization is measured by Singular Value Decomposition (SVD) related indexes. Results showed a statistically sig-nificant widening of T-wave peak-to-end during PTCA pro-cedure in RCA and LAD occluded patients. Besides, a sta-tistically significant dynamic change of the dipolar compo-nents was observed during PTCA in RCA, LAD and LCx occluded patients. On the other hand, the relative energy of non-dipolar components did not change during the time course of increased VRD evolution. 1