A prospective of 30 patients with symptomatic severe congenital valvular pulmonary stenosis who are indicated for percutaneous balloon pulmonary valvuloplasty . the aim is to 1. \- evaluate electrical and mechanical remodeling of RV 6 months following balloon dilation 2. \- evaluate Functional capacity using 6MWT and SaO2 before and 6 months following BPV
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reverse Right ventricular remodeling
Timeframe: one year
functional exercise capacity
Timeframe: one year