Pulmonary valve stenosis. Pulmonary valve stenosis is a defect where the pulmonary valve, which controls the flow of blood out of the right heart pumping chamber (the right ventricle) to the lungs, is narrower than normal. This means the right heart pump has to work harder to push blood through the narrowed valve to get to the lungs. Septal defects
https://www.nhs.uk/conditions/congenital-heart-disease/types/

