The Aortic valve is a door like structure that is situated between the left pumping heart chamber and its main outlet, the aorta that supplies blood to the whole body though its branches. In Aortic valve stenosis the valve is narrowed (like keeping a tap half closed). As the problem is mechanical it does not respond to medicines. Surgery is advised when there are symptoms. The results of surgery however are excellent as the valve is replaced by an artificial valve. There are chances of blood clotting on the metal valve. To prevent this people with replacement need to take blood thinners and monitor its dose by a simple monthly test. Rarely there is a chance of infection of the valve. Despite these problems, with careful attention to doctors advice, the life span of people with aortic valve replacement is almost same as people without this disease.