Aortic Valve Stenosis is a disorder where the aortic valve is abnormally narrow. The aortic valve is the flap that blood flows through when leaving the heart and entering the aorta, the large blood vessel that delivers blood to the body. The valve consists of three triangular-shaped flaps of tissue, but some children are born with an aortic valve that has only one or two flaps and a narrowed opening. Children who have had rheumatoid fever are more likely to develop aortic valve stenosis. This stenosis causes a heart murmur, which is an abnormality in the heart rhythm, and sometimes ventricular hypertrophy, or enlargement of the lower chambers of the heart. If left untreated, it can lead to shortness of breath, chest pain, or even heart failure. It can be diagnosed with a chest exam and an echocardiography, a study which helps to evaluate heart function. Surgery can be used to repair the stenosis if a patient is having severe symptoms, but medications to lower blood pressure and normalize heart rhythm can also be used to relieve less severe symptoms.