1974 Volume 38 Issue 1 Pages 51-64
The purpose of this study is to clarify the relation between vectorcardiographic configuration and hemodynamic factors of atrial septal defect (herein after refered to as ASD) Many authors made vectorcardiographic studies in ASD to date. The vectorcardiograms in ASD are known to show a unique configuration of counter clockwise rotation and terminal bunching on horizontal plane. However, the qunatitative analysis of the foregoing is rather complicated, in that, each instantaneous vector has no specific tendency as to magnitude and direction. Therefore, the condition of ASD derived from vectorcardiogram has always been qualitatively. It is now important to realize how much information of hemodynamics will be brought out from vectorcardiographiq parameters. Instead of the instantaneous QRS SE vector, the sequential composite QRS SE vector was used as vectorcardiographic parameter. The advantage of this method are: 1) to be able to effectively adopt as the parameter the terminal bunching vector having prolonged duration time. 2) to be able to comprehend as a whole each instantaneous QRS sE vector which may vary from time to time. For the prediction of the severeness in ASD from vectorcardiogram, the author made a comparison between sequential composite QRS sE vectors and hemodynamic factors using multivariate analysis. Method A total of 27 cases, 15 males, 12 females, ranging from 14 to 62 years of age with ASD (ostium secundum) were studied. Chest X-ray, phonocardiography and right ventricular catheterization were used to establish and comfirm the diagnosis of ASD. The three planar projections of vectorcardiogram were photographied on 60 × 60 mm X-ray films simultaneously by three channel vectorcardiography useing the Frank system. The method of morphological observations and quantetative analysis are as follow.
