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PubMed This is a summary of 20 peer-reviewed journal articles Updated
Nephrology · Atherosclerotic Renal Artery Stenosis

When a Stent May Be Considered

At a Glance

A renal artery stent is not routinely needed for stable plaque-related narrowing. Doctors may consider it when severe blockage causes repeated lung-fluid episodes, blood pressure resistant to three medicines, rapidly worsening kidney function, or threatens a solitary functioning kidney.

While the vast majority of people with renal artery atheroma are successfully managed with medication, there is a specific group of patients for whom a procedure may be considered to help protect their heart and kidneys. This procedure is called revascularization, and it almost always involves placing a stent—a small mesh tube—to prop open the narrowed artery [1][2].

Who Truly Benefits from a Stent?

Because major clinical trials (like CORAL and ASTRAL) showed that routine stents do not improve outcomes for most stable patients, doctors now reserve this treatment for “high-risk phenotypes.” You may be evaluated for a stent if you meet one of the following criteria:

  • Flash Pulmonary Edema (Pickering Syndrome): This is a life-threatening situation where fluid suddenly builds up in your lungs due to the kidneys’ hormonal response [3]. If you have had more than one episode of sudden, severe shortness of breath, a stent is often evaluated to help stop the cycle [4][1].
  • Truly Resistant Hypertension: This is defined as blood pressure that stays uncontrolled even though you are taking at least three complementary blood pressure medications at maximally tolerated doses, including a “water pill” (diuretic) [5][6].
  • Rapidly Declining Kidney Function: If your kidney function (eGFR) is dropping quickly and your doctor can confirm a severe blockage, a stent may be evaluated to help “salvage” the kidney before the damage becomes permanent [6][7].
  • Critical Narrowing in “Key” Areas: Stenting is much more frequently considered if you have severe narrowing in both renal arteries (bilateral disease) or if you have only one functioning kidney that has a severe blockage [6][8].

(Note: Stenting for non-atherosclerotic conditions like fibromuscular dysplasia is handled differently and is outside the scope of this page.)

Is the Kidney Still “Viable”?

A stent generally only works if there is healthy kidney tissue left to save. If a kidney has already shrunken significantly or is heavily scarred, opening the artery may not help [9]. Doctors look for “signs of life” in your imaging reports:

  • Kidney Size: A kidney length of at least 9.8 to 10 centimeters suggests the tissue is likely still salvageable, while very small kidneys are less likely to benefit [10][11].
  • Resistive Index (RI): This measurement from your ultrasound estimates how much resistance there is to blood flow inside the kidney. A lower RI is a good sign that the kidney might recover once blood flow is restored [12][13].

The Procedure: PTRA with Stenting

The procedure is called Percutaneous Transluminal Renal Angioplasty (PTRA). It is performed in a “cath lab” and is similar to getting a heart stent:

  1. A thin tube (catheter) is inserted through an artery in your groin or arm.
  2. Using X-ray guidance, the doctor moves a tiny balloon to the area of the blockage and inflates it to widen the artery.
  3. A metal stent is placed to keep the artery open.

While effective in selected patients, this procedure carries specific risks that vary based on your anatomy and baseline health:

  • Access-Site Issues: Bleeding or a hematoma where the catheter was inserted.
  • Atheroembolism: During the procedure, small bits of plaque or cholesterol crystals can break off and travel deeper into the kidney or even down to your toes (sometimes called “blue toe syndrome”), which can cause temporary or permanent damage [14][15].
  • Contrast-Induced Injury: The “dye” used to see the arteries can be hard on the kidneys. A percentage of patients may experience a temporary drop in kidney function (Acute Kidney Injury) after the procedure [16][14].
  • Restenosis: In a minority of cases, the artery can begin to narrow again inside the stent over several years [17][18].
  • Antiplatelet Need: You will be required to take medications like clopidogrel or aspirin exactly as directed to prevent clots in the new stent.

Note on Open Surgery: In the past, doctors performed major “bypass” surgeries for the renal arteries. Today, this is very rare and is typically only used if multiple stent attempts have failed or if the patient needs surgery for other major abdominal artery problems [19][20].

Common questions in this guide

When might a renal artery stent be considered?
A stent may be considered when severe renal artery narrowing is linked to repeated sudden fluid buildup in the lungs, blood pressure that remains uncontrolled despite three appropriate medicines including a diuretic, or rapidly worsening kidney function. It may also be evaluated when both renal arteries are severely narrowed or a single functioning kidney is at risk.
Does everyone with renal artery stenosis need a stent?
No. Most people with stable plaque-related renal artery narrowing are treated with medication and risk-factor management, because routine stenting has not improved outcomes for most stable patients. The decision depends on symptoms, blood pressure control, kidney function, imaging, and overall health.
How do doctors know whether a kidney can benefit from a stent?
Imaging can show whether the kidney still has enough healthy tissue to recover after blood flow improves. A kidney measuring about 9.8 to 10 centimeters or more and a lower ultrasound resistive index may be more favorable, while a very small or heavily scarred kidney is less likely to benefit.
What happens during renal artery angioplasty and stenting?
A doctor guides a thin catheter through an artery in the groin or arm using X-ray imaging. A small balloon widens the narrowed area, and a mesh stent is placed to help keep the renal artery open.
What are the risks of a renal artery stent?
Possible risks include bleeding at the catheter site, plaque or cholesterol traveling into smaller vessels, kidney injury from the contrast dye, and narrowing inside the stent later. Patients also need antiplatelet medicine such as aspirin or clopidogrel as directed to reduce the risk of a clot.
Will a renal artery stent let me stop my blood pressure medicines?
A stent may improve blood pressure control and reduce the number of medicines needed in some people, but it may not eliminate the need for blood pressure treatment. Your clinician will decide whether and when medicines can be adjusted after the procedure.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Do I have one of the high-risk 'phenotypes'—like resistant hypertension or recurrent fluid in my lungs—that makes me a candidate for a stent?
  2. 2.Is my renal artery narrowing considered 'bilateral,' or do I have a 'solitary functioning kidney' that is at risk?
  3. 3.What is the size and 'Resistive Index' of my kidney, and do these numbers suggest the tissue is still healthy enough to benefit from better blood flow?
  4. 4.If we proceed with a stent, what is your plan to protect my kidneys from the contrast dye used during the procedure?
  5. 5.How often will we need to do follow-up ultrasounds to check if the artery is narrowing again (restenosis)?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (20)
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    Sarafidis PA, Theodorakopoulou M, Ortiz A, et al.

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    Atherosclerotic Renovascular Disease: A KDIGO (Kidney Disease: Improving Global Outcomes) Controversies Conference.

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    American journal of kidney diseases : the official journal of the National Kidney Foundation 2022; (79(2)):289-301 doi:10.1053/j.ajkd.2021.06.025.

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    Flash Pulmonary Oedema in a Patient With Unilateral Renal Artery Stenosis and Preserved Contralateral Function: A Medically Managed Case Report.

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    Cureus 2025; (17(11)):e98005 doi:10.7759/cureus.98005.

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    Renal artery stenting in the correct patients with atherosclerotic renovascular disease: time for a proper renal and cardiovascular outcome study?

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    Resistant Hypertension and Atherosclerotic Renal Artery Stenosis: Effects of Angioplasty on Ambulatory Blood Pressure. A Retrospective Uncontrolled Single-Center Study.

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    Patient Selection for Revascularization of Atherosclerotic Renal Artery Stenosis: Comparing the Importance of Stenosis Severity and Clinical Phenotype.

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    When and How Should We Revascularize Patients With Atherosclerotic Renal Artery Stenosis?

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This page is for informational purposes only and does not constitute medical advice. Your nephrologist or interventional specialist should assess whether a renal artery stent is appropriate for your situation.

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