[Studies on the spatial velocity electrocardiogram in ventricular septal defect (authors's transl)].

The QRS waves of the spatial velocity electrocardiogram (ECG) were investigated in 94 cases of the ventricular septal defect (VSD). The relationship between the amplitudes and the time intervals of QRS waves of the spatial velocity ECG and the various hemodynamic parameters obtained by the right heart catheterization and the defect area ascertained during the operations were evaluated.