Ventricular repolarization dispersion during ischemia course measured by temporal and spatial electrocardiographic parameters

In this work we studied the evolution of increased ventricular repolarization dispersion (VRD) in the ECG during ischemia induced by Percutaneous Transluminal Coronary Angioplasty (PTCA). T-wave duration is measured by an automatic delineator and proposed as a index to quantify increased VRD. Moreover, spatial complexity of repolarization is measured by Singular Value Decomposition (SVD) related indexes. Results showed a statistically significant widening of T-wave peak-to-end during PTCA procedure in RCA and LAD occluded patients. Besides, a statistically significant dynamic change of the dipolar components 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.