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PubMed This is a summary of 19 peer-reviewed journal articles Updated
Pediatric nephrology

Treatment Options for Narrowed Arteries

At a Glance

Treatment for congenital renal artery stenosis in children is individualized: blood pressure medicine may be used first, angioplasty is often the main procedure, and bypass or other surgery may be needed for complex disease. Long-term blood pressure and imaging follow-up are important.

Treating Congenital Renal Artery Stenosis (CRAS) is a delicate balance. The goals are to protect your child’s heart and kidneys from the damage of high blood pressure while using the least invasive methods possible. Because children are still growing, their treatment plan must be highly individualized and managed by a multidisciplinary team of specialists [1][2].

Phase 1: Medical Management

The first step is often using medication to bring blood pressure under control. While several types of drugs are used, one class requires extra caution in children with CRAS.

  • The ACE Inhibitor and ARB Warning: Drugs like enalapril (an ACE inhibitor) or losartan (an ARB) are common blood pressure medications. However, they can carry risks for children with narrowing in both renal arteries or in a child with only one functioning kidney [3][4]. These drugs work by reducing the constriction in the kidney’s efferent arteriole (the exit path). In a narrowed artery, the kidney depends on that constriction to maintain enough pressure to filter blood. If it is reduced by medication, the kidney’s filtration rate (GFR) can drop abruptly, leading to kidney strain [3][5]. Your doctor will monitor your child’s blood tests (creatinine and potassium) closely when starting these medications, and you should never change doses without their advice [4].

Phase 2: Angioplasty (PTA)

For many children, the primary treatment is Percutaneous Transluminal Angioplasty (PTA). This is a minimally invasive procedure where an interventional radiologist uses a tiny balloon to stretch the narrowed part of the artery [1][6].

  • Success Rates: PTA can be effective at opening the vessel, with technical success rates in some specific pediatric cohorts reported around 90-94% [7][8]. Depending on the study and definition used, about 40% of children are “cured” (meaning they no longer need blood pressure medicine), and another 28-30% see significant improvement in their blood pressure [7][9].
  • The Need for Repeat Procedures: Because the blood vessel walls in children are often very “springy” or elastic, they can narrow again over time (restenosis) [1]. In some studies, about 25% of children will need a repeat angioplasty to keep the vessel open [7].
  • Why Stents are Used Sparingly: In adults, doctors often place a metal mesh tube (stent) to keep the artery open. In children, stents are generally avoided when possible because they cannot grow as the child grows [1]. They also carry risks of kinking, breaking, or becoming blocked, which can make future surgeries much harder [10][11]. Stents are typically considered selectively for issues like severe recoil, dissection, or failure of angioplasty [1].

Phase 3: Surgical Options

If angioplasty is not possible or hasn’t worked, surgery may be considered. This is more common in complex cases like Mid-Aortic Syndrome or when the narrowing is at the very “mouth” of the artery (ostial stenosis) [12][13].

  • Aortorenal Bypass: A surgeon creates a “detour” for blood flow using a piece of another vessel to go around the blockage [13].
  • Autotransplantation: In complex cases, the surgeon may temporarily remove the kidney and reattach it to a different blood vessel nearby where the flow is stronger [14][15].
  • Nephrectomy (Rare): If a kidney is severely damaged, non-functioning, and causing life-threatening high blood pressure that cannot be controlled any other way, the surgeon may remove that kidney [13][16]. This is generally only considered when the other kidney is healthy enough to do the work for both [17].

Long-Term Monitoring

Regardless of the treatment chosen, your child will need long-term follow-up. This includes regular blood pressure checks and periodic imaging, such as Doppler ultrasounds, to ensure the artery remains open and the kidneys are growing properly [16][18]. Recurrence can sometimes happen years later, so staying connected with your child’s nephrology team is essential [19].

Common questions in this guide

What treatment is usually tried first for congenital renal artery stenosis in children?
Doctors often begin with medicine to control high blood pressure, but the plan depends on how severe the narrowing is and whether one or both kidneys are affected. Balloon angioplasty is also a common treatment for children when the artery can be safely opened.
Are ACE inhibitors or ARBs safe for a child with renal artery stenosis?
These medicines can be risky when both kidney arteries are narrowed or when a child has only one functioning kidney. They can cause kidney filtration to fall suddenly, so doctors may check creatinine and potassium closely and adjust treatment based on the results.
How does angioplasty help children with congenital renal artery stenosis?
During angioplasty, an interventional radiologist uses a small balloon to widen the narrowed part of the artery. It can improve blood flow and blood pressure, but the artery may narrow again as the child grows, so some children need another procedure.
Why are stents usually avoided in children with renal artery stenosis?
A stent is a small mesh tube that holds an artery open, but it cannot grow with a child. Stents can also kink, break, or become blocked and may make later surgery more difficult, so doctors generally reserve them for selected problems or unsuccessful angioplasty.
When might surgery be needed for congenital renal artery stenosis?
Surgery may be considered when angioplasty is not possible or has not worked, especially with complex disease or narrowing at the artery's origin. Options can include an aortorenal bypass or kidney autotransplantation; removing a severely damaged kidney is rare and requires a healthy opposite kidney.
What follow-up does a child need after treatment?
Long-term follow-up usually includes regular blood pressure checks, kidney function blood tests, and imaging such as Doppler ultrasound. These checks help identify recurrent narrowing and confirm that the artery stays open and the kidneys continue to grow properly.

Questions For You

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Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Is my child's stenosis affecting one kidney or both, and does this change which medications are safe to use?
  2. 2.What is the specific target for my child's blood pressure, and how often should we check their kidney function (creatinine) while on medication?
  3. 3.Does my child's anatomy make them a good candidate for angioplasty, or is surgery a more reliable first option in their case?
  4. 4.If we choose angioplasty, what is your team's typical repeat rate for restenosis in children of this age?
  5. 5.Under what specific circumstances would you consider using a stent, and what are the long-term risks for a growing child?
  6. 6.If surgery is needed, which procedure (like bypass or autotransplantation) do you recommend, and why?

References

References (19)
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    Primer on Renovascular Hypertension in Children: Focus on Endovascular Intervention.

    Chong AT, Bertino FJ, Zhu Y, et al.

    Radiographics : a review publication of the Radiological Society of North America, Inc 2025; (45(6)):e240070 doi:10.1148/rg.240070.

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    Pediatric Renovascular Hypertension: Diagnosis and Management.

    Minhas K, Cahill AM, Patel PA

    Seminars in interventional radiology 2025; (42(3)):269-278 doi:10.1055/s-0045-1811577.

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    Renovascular hypertension in pediatric patients: update on diagnosis and management.

    de Oliveira Campos JL, Bitencourt L, Pedrosa AL, et al.

    Pediatric nephrology (Berlin, Germany) 2021; (36(12)):3853-3868 doi:10.1007/s00467-021-05063-2.

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    Current management of renal artery stenosis.

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    Panminerva medica 2016; (58(1)):94-101.

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    Secondary Hypertension: Discovering the Underlying Cause.

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    American family physician 2017; (96(7)):453-461.

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    Mid-to-long term outcomes following renal artery angioplasty in children and young adults with renal artery stenosis: a retrospective review.

    Youssef S, Gill AE, Shah JH, et al.

    Pediatric nephrology (Berlin, Germany) 2025; (40(8)):2589-2597 doi:10.1007/s00467-025-06727-z.

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    [Efficacy of percutaneous transluminal renal angioplasty for pediatric renovascular hypertension: a meta-analysis].

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    Long-term outcomes of angioplasty for pediatric renovascular hypertension: A single-center experience.

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    Midterm Outcomes of Angioplasty for Pediatric Renovascular Hypertension.

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    Successful percutaneous transluminal renal angioplasty with multimodality imaging guidance for a juvenile patient with renovascular hypertension due to fibromuscular dysplasia.

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    Outcomes of percutaneous transluminal renal angioplasty for pediatric renovascular hypertension: a 12-year retrospective single-center experience.

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    Remedial operations for failed endovascular therapy of 32 renal artery stenoses in 24 children.

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    Early experience with renal autotransplant for renal artery stenosis in a 6-year-old patient with neurofibromatosis type 1: a case report.

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    Surgical management of pediatric renin-mediated hypertension secondary to renal artery occlusive disease and abdominal aortic coarctation.

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This page is for informational purposes only and does not constitute medical advice. Your child's pediatric nephrologist and treatment team can explain which option best fits their anatomy, blood pressure, and kidney function.