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Three-Dimensional Vectorcardiography (3-D VCG) by Computer Graphics in Old Myocardial Infarction

Third Department of Internal Medicine, Kyoto Prefectural University of Medicine, Department of Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan

Kazuto Kitamura

Third Department of Internal Medicine, Kyoto Prefectural University of Medicine, Department of Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan

Yoshizumi Habuchi

Third Department of Internal Medicine, Kyoto Prefectural University of Medicine, Department of Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan

Nobuyuki Tanaka

Third Department of Internal Medicine, Kyoto Prefectural University of Medicine, Department of Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan

Youichi Nishimoto

Third Department of Internal Medicine, Kyoto Prefectural University of Medicine, Department of Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan

Masaaki Hirano

Third Department of Internal Medicine, Kyoto Prefectural University of Medicine, Department of Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan

Yoshinori Tsujimura

Third Department of Internal Medicine, Kyoto Prefectural University of Medicine, Department of Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan

Hajime Hamamoto

Third Department of Internal Medicine, Kyoto Prefectural University of Medicine, Department of Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan

Tadahiro Takanashi

Third Department of Internal Medicine, Kyoto Prefectural University of Medicine, Department of Laboratory Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan

By using computer graphics we rotated the vector loop and three coordinate axes to find the viewpoint where the infarctional changes are maximally exposed and demonstrated the advantage of the "3-D VCG" over the conventional VCG by defining the quantitative "MI index."

The orthogonal electrocardiogram recorded by the Frank lead system was digitally measured and processed by a microcomputer. The loops and axes were rotated about the X axis (X-rot) and the Y axis (Y-rot). The spatial vector loop and orthogonal coordinates can be presented as viewed from any spheric direc tion. Eight quadrants were illustrated with four colors and red circles.

The subjects consisted of 30 patients with old anterior myocardial infarction (MI) and 15 patients with old inferior MI. We measured the area of "Bite" in anterior MI and superior displacement in inferior MI. The MI index was de fined and averaged in 361 directions.

In anterior MI, the maximum mean index was obtained when X-rot is +90° and Y-rot -40°, viewed from upward and leftward, whereas in inferior MI it was obtained when X-rot is -50° and Y-rot -80°, viewed from downward and leftward.

These values were significantly higher than those in conventional VCG pro jections, substantiating superior diagnostic sensitivity of 3-D VCG.

Angiology, Vol. 38, No. 6, 449-456 (1987)
DOI: 10.1177/000331978703800604


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