Study on Orthogonal VCG, Using Unipolar Lead (II) (Chapter 3)

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1) With a view in mind that the precordial leads are so approximate to the scalar projections of VCG to the lead axes of the former, the two electrode sites on the chest, where the precordial lead most resembles to X or Z lead of Takayasu's system have been explored and have been respectively named V_x and V_z. A new VCG system which employs unipolar V lead on V_x, V_z, and aVF is devised and named V system. V system VCG is compared with Takayasu's, Frank's and Grishman's system VCG, and also discussed that V system VCG is suitable to be used as the orthogonal VCG. 2) This fact means that the local effect to precordial lead is unexpectedly small i. e. the electromotive-force of the heart may be treated as a single fixed dipole and/or that the lead field of the precordial lead through the heart is unexpectedly parallel and uniform. 3) V system has a tendency to emphasize the abnormal findings in comparison with other orthogonal systems. 4) V system has many such advantages in clinic as shown in the the followings ; a) Lead method is very simple. Therefore, this system is very suitable for screening test and also for exercise test. b) Because of no electrode on the back, the VCG can be recorded with a serious patient keeping him in dorsal position. c) Because of the simplicity of the lead points (only two points on the chest) it has a good reproducibility. d) V system has a tendency to emphasize the abnormal findings of the heart. Therefore it can be very suitable for screening test. 5) As a substitute of mean QRS vector, there are several methods, i. e. half area vector, main vecfor, and others. They are, however, still troublesome in practice. The author has devised a new simple method, i. e. bisection QRS vector and eventually has reffered its advantage.
社団法人日本循環器学会の論文
1963-09-20

Study on Orthogonal VCG, Using Unipolar Lead (II) (Chapter 3)

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