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Renal artery stenosis is a narrowing in the blood vessels of the kidneys. This narrowing can reduce the flow of blood to the kidneys. With reduced blood flow, the kidneys do not function properly. Over time, reduced blood flow to the kidneys can lead to high blood pressure and chronic renal disease (the slow loss of kidney function). High blood pressure damages the small blood vessels in the kidneys, reducing their ability to filter waste from the blood. Renal artery stenosis develops and worsens over time. Without treatment, kidney damage will progress and can result in kidney failure.
Atherosclerosis (hardening of the arteries) causes renal artery stenosis. Atherosclerosis occurs when plaque builds up on the artery walls, narrowing them and slowing blood flow. Factors that increase your risk for atherosclerosis include:
Many of these risk factors can be reduced or eliminated by changing your lifestyle.
Because renal artery stenosis develops slowly and worsens over time, there are no obvious symptoms.
Ohio State's vascular surgeons are experts in the treatment of renal artery stenosis. They offer both minimally invasive treatments, such as opening of the renal arteries with stents, and they also perform open bypass surgeries to improve blood flow to the kidneys, if necessary.
Tests to diagnose renal artery stenosis include:
Treatment focuses on preventing further damage to the blood vessels of the kidneys, which can lead to chronic kidney disease. Lifestyle changes, such as quitting smoking, avoiding fatty foods, following a healthy, low-fat diet and exercising may help patients reduce their risk factors for high blood pressure.
Your physician may prescribe medications to lower your blood pressure. They may include:
If plaque is blocking the renal artery, your physician may recommend a procedure to open the artery.
Angioplasty is a minimally invasive procedure to open blocked arteries and increase blood flow. During this procedure, a surgeon inserts a catheter through small incisions in the groin, guiding it to the renal artery. The catheter carries a tiny balloon, which is inflated and deflated, pushing built-up plaque against the artery wall. A stent may be inserted to prevent the artery from becoming blocked again and to improve blood flow.
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