Pulmonary stenosis is a condition in which the flow of blood from the heart to the lungs is obstructed, caused by a deformed and narrowing of the pulmonary valve, or a deformity above or below the valve. In adults there are sometimes problems as a complication of another disease, but most pulmonary stenosis develops before birth.

Heart valve stenosis is one of the dangerous cardiovascular diseases, threatening the health of many patients. In the treatment methods of the disease, percutaneous balloon dilation is a safe, low-risk technique that has good effects in improving symptoms in patients with mitral stenosis.