Slide show: Common types of congenital heart defects
Image of heart with pulmonary valve stenosis
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In this condition, blood flow from one of the heart's bottom chambers, the right ventricle, to the pulmonary artery is slowed by narrowing at the pulmonary valve. When there's narrowing (stenosis), the right ventricle must pump harder to get blood into the artery that carries blood to the lungs (pulmonary artery). Pulmonary valve stenosis may occur along with other defects, such as thickening of the muscle of the right ventricle below the valve.

In many cases, pulmonary valve stenosis is mild and doesn't require treatment. But because it can cause heart failure, arrhythmias or enlargement of the right heart chambers, it may be necessary to correct the defect. In many cases, a balloon (pulmonary valvuloplasty) opens the narrowed valve. In some cases, especially in people with other heart defects, surgery may be necessary to replace the diseased valve with an artificial valve.

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