Vectorcardiogram in Cyanotic Heart Disease (Frank System)

I. Tetralogy of Fallot

Abstract

The preoperative and postoperative VCG recorded with Frank orthogonal system in tetralogy of Fallot were analyzed.
The severe right ventricular hypertrophy, which could be subdivided into six subgroups on the basis of the degree of polycythemia, was observed in all preoperative patients. From the surgical view point, the utmost care should be taken for the treatment of the patients with VCG of type F.
Many vectorial features, which were noted in the present study, were assumed to be shared among several cyanotic heart diseases as well.
The postoperative change of VCG was indicated most clearly in the inscription of the loop in HP.