An approach to the construction of ideal lead ECG and VCG.

Abstract

(1) The main purpose of this report is to introduce the principle of the newly-devised construction method for the ideal vectorcardiographic and electrocardiographic QRS patterns by means of the photographicoplanimetric technique.(2) Ideally registered scalar and Lissajou's patterns of QRS complex by the application of the present technique were compared with the patterns clinically registered from the human subject through the various vectorcardiographic lead systems, for the purpose in estimating the validity and the superiority of the lead system in the sense of capability to register the undistorted pattern of the electromotive forces of the heart without any appearance of undue electrical distortion of the manifest vector.(3) Alternation in the sequence of ventricular depolarization at the proper region of myocardium could produce the characteristic QRS wave or QRS loop compatible to the right bundle branch block, the left bundle branch block or myocardial infarctions.(4) The QRS waves of 3 standard bipolar limb leads (I, II and III) and the precordial QRS waves (V1-V6) were constructed by multiplying the heart vector components (X, Y and Z data derived from the measurement by the photographico-planimetric technique) with the lead vector coefficients for bipolar leads and the precordial leads, and these waves thus obtained were very similar in configuration with those of actual conventional lead electrocardiograms clinically recorded.(5) This approach introduced in the present paper seems to give good clue for the understanding of the quantitative change of the routine ECG and VCG.