Filtered vector cartography: Analysis of loop characteristics in normal subjects

Filtered vector cardiographie loops in the three X, Y and Z planes have been obtained and analyzed by digitizing the ECG´s from the three orthogonal axes. Each loop was characterized by the length of the maximum vector, the angle of the maximum vector and the direction of the vector loop. The frequency dependence of these parameters were analyzed by using notch filters of various frequencies from 20 Hz to 90 Hz in steps of ten, for filtering the ECG´s before their digitization. The results showing frequency dependence of these parameters seem to suggest the diagnostic potential of such an analysis.