Severe blockage may cause chest pain or feeling a loss of consciousness with activity. Symptoms depend on what caused the blockage.
Sometimes a defective aortic valve becomes blocked when the person is an adult.
Less commonly, the valve defect may occur in infancy. It can produce severe blockages to the flow of blood out of the heart and heart failure.
More often, symptoms occur in later childhood. They include a blocked aortic valve and a lack of oxygen. There are usually no other symptoms, although a heart murmur can be heard. Abnormal sounds caused by the closing of the valve may also be heard. A complication of the condition can be an infection in the heart.
Causes and Risk Factors
The narrowing may occur in the valve, below it or above it. Sometimes blockages that happen above the valve because too much calcium is in the blood. They may be accompanied by peripheral pulmonary artery stenosis. Blocks below the valve are sometimes caused by a ridge built up of fibers of tissue. They may also be caused by a build-up of muscle.