Pulmonary stenosis is a relatively common congenital heart defect. Usually these children with mild to moderate pulmonary stenosis survive into childhood. Since bicuspid pulmonary stenosis is infrequent (< 20 per cent) and heavy calcification uncommon, pulmonary stenosis is well suited for balloon pulmonary valvuloplasty.
Classification of Severity of Pulmonary Stenosis
Severity to PS Transvalvular Gradient
Mild PS < 50 mmHg
Moderate PS 50 - 100 mmHg
Severe PS > 100 mmHg