Below is an instruction from Human. Write a response.
    ### Instruction:
    What to do for Renal Artery Stenosis ?
    ### Response:
    - Renal artery stenosis (RAS) is the narrowing of one or both renal arteries. The renal arteries are blood vessels that carry blood to the kidneys from the aortathe main blood vessel that carries blood from the heart to arteries throughout the body.  - Renovascular hypertension (RVH) is high blood pressure caused by RAS.
    