Longitudinal modifications of T-loop morphology

Serial analysis is performed to evaluate longitudinal modifications of electrocardiographic parameters concerning morphology variations of repolarization phase, using the vectorcardiogram (VCG). The orthogonal Frank leads were synthesized from the standard 12 lead ECG. For this purpose, five parameters were obtained from the VCG with two different methods of considering the zero point. The population based ECG-ILSA database (Italian Longitudinal Study on Aging) was used. All the patients present both in t₁ and t2=t1+5 years were considered, and those classified as healthy (147), with cardiac diseases (77), with hypertension (219), with angina pectoris (44) and with MI (51) were included in this study. The observed results show a stability T-loop morphology measurements in a temporal interval of 5 years. In addition, the Angina Pectoris group, characterized by a high "clinical instability" showed the most significant longitudinal modifications.