https://www.gosh.nhs.uk/conditions-and-treatments/conditions-we-treat/pulmonary-stenosis/
Pulmonary stenosis
Pulmonary stenosis is a narrowing of the valve between the right pumping chamber (right ventricle) and the large blood vessel that carries blood to the lungs to pick up oxygen (pulmonary artery).
This means the heart has to work harder to pump blood through the narrowed valve and over time, makes the muscle in the right ventricle thicken.
Pulmonary stenosis is a form of congenital heart disease – a term used to describe a problem with the heart’s structure and function due to abnormal development before birth.
Our Cardiorespiratory Unit regularly refers to information published by the British Heart Foundation (BHF) and the Children's Heart Federation when explaining pulmonary stenosis to our patients and their families.