ABSTRACT
We find that there is a correlation among thesize of ventricular septal defect (VSD) (X_2), PaO_2(X_3), V. /V. (X_7) and pulmonary systolic pressure(Y_1), diastolic pressure (Y_2), mean pressure (Y_3)by multivariate stepwise regression analysis, andso there are their parameters in the regression e-quations. The regression equations are Y_1 = 13. 24+ 0. 22X_2 - 0. 09X_3 + 0. 14X_7; Y_2 = 0. 65 + 0. 24X_2+ 0. 12X_7; Y_3 = 3. 54+ 0. 17X_2 + 0. 16X_7. But thecourse of the disease, ∑9 leads QRS dimension,R. /R., L. /L. are non-dominant factors, and sothere are not their parameters in the regression e-quation. The above-mentioned equations mayavoid the patients. with mild, moderate pulmonaryhypertension to have invasive examination, and re-duce its complications.