Aortic Stenosis is a Valvular heart disease caused by the incomplete opening of the aortic valve. This valve controls the direction of blood flow from the left ventricle to the aorta. When the aortic valve works it does not impede the flow of blood between these two spaces. If the aortic valve becomes narrower than normal, slowing down the flow of blood. This is known as aortic valve stenosis, or aortic stenosis.

People with Aortic Stenosis are more apt to get an infection called infective endocarditis. This infection can be fatal and these patients are usually given an antibiotic when they are about to have any dental/medical/surgical procedures. Normally, however, in the absence of aortic stenosis, the heart is able to increase its output and thereby offset the effect of the dilated blood vessels. In aortic stenosis is present, due to the obstruction of blood flow out of the heart caused by the stenosed aortic valve, cardiac output cannot be increased. Low blood pressure or syncope may occur.