心室中隔欠損症の空間マグニチュード心電図QRS波に関する研究

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The QRS wave of the spatial magnitude electrocardiogram (ECG) was investigated in 86 cases of the ventricular septal defect (VSD). The relation-ship between the amplitude and the time interval of QRS wave of the spatial magnitude ECG and the various hemodynamic parameters obtained by the right heart catheterization and the defect area ascertained during the operations were evaluated. Methods and Subjects: 1. Subjects. Mean age of the subjects was 11.2 ± 8.2, ranging from 3 months to 34 years old. Cardiac catheterization was performed in 65 cases (75.6%), and the diagnosis was ascertained in 56 cases (65.1%) by cardiac surgery. They were classified into the following 5 types by the location of the defect, namely supracristal (8 cases), infracristal (32 cases), subvalvular (7 cases), muscular (none) and multiple VSD (10 cases). At investigation of the measured values, they were classified into the following three groups by their age, namely group I (less than 2 years old, 7 cases), group II (from 2 to 13 years old, 48 cases) and group III (more than 14 years old, 31 cases). 2. Recording of the spatial magnitude ECG: Spatial magnitude ECG was recorded by means of the spatial magnitude electrocardiograph constructed by Mori et al., leading each scalar ECG of Frank system to squaring, adding and square root circuits in order. Following formula was computed automatically by this apparatus. spatial magnitude ECG = √<X^2+Y^2+z^2> Recording was made by means of 4 channel heat writing oscillograph simultaneously with 3 scalar ECG of Frank lead. The recording speed was 100 mm/sec. Results and Summary: 1. Patterns of the QRS wave of the spatial magnitude ECG were classified into 4 types. Type A showed trianglar configuration. There was a notch or a slur in front of the main QRS wave in type B, and at the behind of the main QRS wave in type C. In type D, a notch or a slur was located in front and at the behind of the main QRS wave. Type C was further subdevided into type C_1 and C_2 The amplitude of the terminal notch (h_3) was higher than a half of that of the main wave (h_2) in the former and was lower in the latter. Type D was also classified into type D_1 and D_2 in similar way as in type C. Type A was observed in 7%, type B in 11.6%, type C_1 in 17.4%, type C_2 in 15.0% (totally 32.4% in type

心室中隔欠損症の空間マグニチュード心電図QRS波に関する研究

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