心房中隔欠損症(二次口開存)の術前, 術後のベクトル心電図(Frank法)に関する研究

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The Vectorcardiogram observed by the Frank system which were recorded in 21 cases with atrial septal defect of the secundum type that showed the right ventricular diastolic overloading were comparatively studied with respect to alterations following surgical correction. The VCGs were classified into A group with no showed delay of the terminal conduction in the QRS loop and into B group in which a delay of terminal conduction in the QRS loop was observed. The following results were made in the present study. 1. In the cases with a moderate overloading for the right ventricule, the VCGs showed marked restoration toward the normal pattern one month after operation. 2. The cases with elevation of the systolic pressure in the right ventricule and pulmonary artery showed the anterior displacement in the QRS loop before operation. These displacements in the QRS Loop were unchanged ever one month after operation. After one year following operation the QRS loops were however displaced toward the left posterior and counterclockwise in the rotation but not considered to be complately normal. 3. The terminal conduction delay in the QRS Loop was observed in 6 of 21 cases before they were operated, and in three additional cases among them even after their operation. In these cases, the QRS loops which showed the anterior displacement and the clockwise rotation before and after operation were displaced toward the left posterior and the counterclockwise rotation one year following surgical correction. However, these delay in the QRS was found in all cases one year after operation. 4. In the Vectorcardiogram of atrial septal defect, the pattern of the QRS Loop which the anterior displacement, the clockwise rotation and the terminal conduction delay were simultaneously observed in the horizontal plane might be due to the right ventricular diastric overloading. 5. There was no close correlation between the direction of the initial vector and the terminal conduction delay. 6. An increase in numbers of T loops having the figure of eight and the irregular pattern in both A and B groups were significantly observed one month postoperatively. A change to the normal pattern in the T loops was however obtained one year after operation. 7. The direction of the maximum T vector in the horizontal plane was displaced to the left posterior from the left one month after operation, followed by the change back to the left one year. However, these VCGs were not considered to be normal. 8. The pattern of the QRS loop was clearly suggest the hemodynamics in heart following surgical correction, although the pattern of the T loop was remained to be unaffected.
社団法人日本循環器学会の論文
1973-11-30

心房中隔欠損症(二次口開存)の術前, 術後のベクトル心電図(Frank法)に関する研究

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