Comparison of different methods for the derivation of the vectorcardiogram from the ECG and morphology descriptors

Several methods have been proposed for both the derivation of the vectorcardiogram from the 12-lead ECG and the quantification of the morphology of vectorcardiograms. The aim of this study was to compare commonly used QRS/T morphological descriptors obtained with different transforms. Vectorcardiograms were reconstructed for 180 patients by applying Singular Value Decomposition and Dowerpsilas inverse transform. Planes of best fit, morphology dispersion ratio, complexity ratio, wave residuum and normalized loop area were calculated among other parameters. Parameters computed after different derivation methods were poorly correlated. Also, low correlation values were found among any of the morphological parameters under evaluation.