Original Article: http://www.mayoclinic.com/health/medical/IM00479
- Pulmonary stenosis
- Slide show: Common types of congenital heart defects
In pulmonary stenosis, the flow of blood from the right ventricle to the pulmonary artery is obstructed by narrowing at the pulmonary valve. The greater the constriction, the harder the right ventricle must pump to get blood into the pulmonary artery.