The pathophysiology of<unk>  consists of the valve leaflets becoming too thick (therefore not separate one from another), which can cause high pulmonary pressure, and pulmonary hypertension. This however, does not mean the cause is always congenital. The left ventricle can be changed physically, these changes are a direct result of right ventricular hypertrophy. Once the obstruction is subdued, it (the left ventricle) can return to normal.
Pulmonary valve stenosis
Pulmonary vein stenosis
Tricuspid valve stenosis
Pulmonic stenosis
Supravalvular aortic stenosis
Double inlet left ventricle
Mitral stenosis
Accessory auricle