Voltage sum of filtered ECG signal--a sensitive parameter of ventricular activation

On the basis of the signal averaged ECG (SA ECG) principle the authors analyse the gradually filtered ECG signal (in ranges of 0-120 Hz with increments of 10 Hz). The voltage sums are determined in eight segments of the QRS complex. The described VSF-ECG method (Voltage Sum of Filtered ECG) was applied in a group of healthy probands and in groups of selected patients. The measurements in healthy probands were used to determine the value of standard in healthy subjects. Repeated measurements confirmed a good reproducibility of the VSF-ECG method. The method enables a precise quantification of heart activation progression. VSF-ECG is a method revealing the changes of heart activation progression being not reflected as late potentials. Parameters of the method are indicators of activation splitting upon the infarction area and also an indicator of the electric milieu of the entire heart.