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- Patient Comments: Renal Artery Stenosis - Cause
- Patient Comments: Renal Artery Stenosis - Diagnosis
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- Renal artery stenosis facts
- What are the renal arteries?
- What is renal artery stenosis?
- What are the causes of renal artery stenosis?
- How common is renal artery stenosis?
- What are the symptoms of renal artery stenosis?
- What problems does renal artery stenosis cause?
- Who should be screened for renal artery stenosis?
- How is renal artery stenosis diagnosed?
- What are the common imaging tests to evaluate renal artery stenosis?
- What functional tests are used for the diagnosis of renal artery stenosis?
- What are medical treatments for renal artery stenosis?
- What surgical procedures are available for renal artery stenosis?
- Which patients can benefit from surgical procedures for renal artery stenosis?
Which patients can benefit from surgical procedures for renal artery stenosis?
In patients with renal failure due to bilateral renal artery stenosis (narrowing on both kidneys), angioplasty procedures for both renal arteries may improve or stabilize kidney function. Similarly, in hypertensive patients with unilateral (one-sided) renal artery stenosis, angioplasty procedures of the involved renal artery may cure or improve the high blood pressure. Patients with milder degrees of stenosis (less than a 75% reduction in the width of the renal artery lumen) usually do not benefit from angioplasty. These patients need to be followed by sequential imaging procedures to detect further narrowing (progression) to the point of treatable stenosis. At that point, angioplasty procedures can be done with the hope of a favorable response.
Some studies have suggested that patients with a very high degree of renal vascular resistance (which reflects permanent damage to the kidneys), even with a 75% or more stenosis of the renal artery, often have a poor response to the angioplasty procedures. (The tension of the blood vessels to the kidney, called renal vascular resistance, is measured by Doppler ultrasonography. A so-called resistive index over 0.8 is considered very high). In these patients, angioplasty is usually not done and the high blood pressure or renal failure is managed only by the customary therapeutic measures for these problems as described previously.
Medically reviewed by Avrom Simon, MD; Board Certified Preventative Medicine with Subspecialty in Occupational Medicine
eMedicine, "Renal Artery Stenosis."
eMedicine, "Renal Artery Stenosis/Renovascular Hypertension."
Previous contributing author and editor: Dwight Makoff, M.D. and Leslie J. Schoenfield, M.D., Ph.D.