2) 3 children with dysplastic valve were reluctant to balloon dilatation and needed surgical valvectomy.

3) A 15 year old girl, died suddenly 6 months after initial successful balloon valvuloplasty, probably caused by right ventricular dysfunction and arrhythmia.

4) In 17 case with residual transpulmonary pressure gradient exceeding 30mmHg after initial balloon valvuloplasty, we recatheterized one or two years later, and found spontaneous relief of pressure gradinent in most cases except two who needed another trial of balloon dilatation.

5) Infundibular and pulmonary annulus diameter ration during systolic phase on lateral cine angiography revealed significant aggrevation of infundibular stenosis immediately after balloon dilatation comparing to pre-dilation but significant relief of that 1-2 years later.

6) R votage in V1 precordial lead revealed rapid decrement in height for initial 6 months after balloon dilatation, and gradually decreased after then.

7) Although the long-term results are still unknown, the current data strongly support the statement that percutaneous transluminal balloon valvuloplasty is the treatment of choice for patients with non-dysplastic pulmonic valve stenosis.