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

Abstract:

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 repo-larization 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.