On X-ray findinds, the proportion of cardiomegaly decreased from 57.9% to 34.2%, and on ECG the ratio of right ventricle hypertrophy reduced from 71.1% to 26.3% The peak systolic pressure gradients between the right ventricle and pulmonary artery obtained by cardiac catherization before and after vavuloplasty were 67 ± 22.3 mmHg and 21.5 ± 14.9 mmHg respectively.