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Utilizing radio frequency energy and the heated catheter, the physician cauterizes â or burns â the tissue surrounding your saphenous vein to close it. Balloon angioplasty/stents for renal vascular hypertension is a procedure to open narrowed arteries that carry blood to your kidneys. It involves inserting a long, thin tube called a catheter through into the narrowed part of the artery.
Renal Artery Stenosis. Renal artery stenosis (RAS) is the narrowing of one or both arteries that carry blood to the two kidneys. âRenalâ means âkidneyâ and âstenosisâ means ânarrowing.â RAS can cause high blood pressure and reduce kidney function.RAS is often overlooked as a cause of high blood pressure.he arteries that carry blood to the kidneysâcalled the renal arteriesâbranch off directly from the abdominal aorta, the main vessel from the heart that supplies blood to most of the bodyâs organs. Healthy kidneys filter out wastes and extra fluid from the blood that passes through them.