The pulmonary valve is too tight so that the flow of blood from
the right ventricle of the heart into the pulmonary artery is
impeded. This means the right ventricle must pump harder than
normal to overcome the obstruction. If the stenosis is severe,
babies may become blue (cyanotic). Older children often have no
symptoms. Treatment is needed if the pressure in the right
ventricle is higher than normal. The obstruction can usually be
relieved by a procedure called balloon valvuloplasty or by open
heart surgery during which the stenotic valve is opened. The
outlook after either procedure is favorable. Common
Misspellings: pulmanary stenosis, pulmenary stenosis