PubMed1984
The findings of the VCG automatic construction in 55 healthy subjects with different axial and positional variants of ECG were analyzed . The applied method of the automatic corrected VCG construction has shown that QRS loop morphology coincides with the classical forms of VCG described before in healthy persons. The data of the automatic calculations of spatial characteristics demonstrated the orientation stability according to the angle--azimuth, max QRSxyz , S/2 QRSxyz and the integral vector-- AQRSxyz , i. e. independence of the azimuth value on the ECG axial and positional variants. The positional and rotational shifts regularly change the azimuth value in the spatial orientation of the initial (0.01"--0.02') and end (0.06") moment vector of depolarization, and the value of the angles of spatial vector elevation max QRSxyz , S/2 QRSxyz , AQRSxyz . In the normal intraventricular conduction, the orientations of max QRSxy , yz , xz are sufficiently informative in order to reveal the integral vector directions. The coincidence of S/2 QRSxy , yz , xz direction with that of AQRSxy , yz , xz in the two-polar loops indicates that S/2 QRSxy , yz , xz should be calculated to determine AQRSxy , yz , xz orientation. Indeed, in case of intraventricular conduction disorders, the AQRSxy , yz , xz calculation alone gives an idea of a resultant vector projection.