What does aortic valve stenosis lead to?

Heart failure: The narrowing of the aortic valve blocks the heart from pumping blood to the rest of the body effectively and overworks the heart as well, further exacerabating the same problem. Thus the body suffers from a lack of oxygen with fatigue.

Aortic stenosis: Aortic stenosis refers to the gradual destruction of the aortic valve. It is a progressive process that eventually leads to shortness of breath and lack of energy with exercise. Untreated it will eventually cause congestive heart failure.