Renal Artery Stenosis in Children
High blood pressure in a child is not treated as ordinary hypertension until a cause has been looked for, because in children a cause is usually found — and narrowing of a renal artery is the one most often correctable. The kidney behind the narrowing reads the reduced flow as low blood pressure for the whole body and drives the pressure up. Opening the artery with a balloon addresses the cause rather than masking it, and is done through a needle puncture at the groin with no incision.
Dr. Mohamed El Ghobashy · Consultant Interventional Radiologist
What it treats
- •Renovascular hypertension caused by fibromuscular dysplasia — the commonest cause in children
- •Renal artery narrowing as part of mid-aortic syndrome
- •Stenosis caused by Takayasu arteritis and other large-vessel arteritis
- •Renal artery stenosis associated with neurofibromatosis type 1
- •Narrowing of the artery to a transplanted kidney
- •Hypertension needing two or three drugs, or not controlled despite them
Who is a candidate?
- Children with hypertension in whom a stenosis is shown on Doppler ultrasound, CT or MR angiography
- Children whose blood pressure needs multiple drugs, or remains high on them
- Children with one kidney that is smaller or functioning less well than the other
- Every case is decided jointly with paediatric nephrology — angioplasty is not an alternative to investigating the cause
- Children with active arteritis are usually treated medically first, because dilating an inflamed artery invites early restenosis
How the procedure works
- 1
Work-up with nephrology
Blood pressure profile, renal function, renin studies and cross-sectional angiography establish that the narrowing is real and is the cause. Drugs are reviewed and the anaesthetic is planned.
- 2
Anaesthesia and access
Under general anaesthetic, a fine sheath is placed in the femoral artery at the groin. Sizes are chosen for the child's vessel — small arteries are damaged by adult equipment.
- 3
Angiography and pressure measurement
A selective angiogram of both renal arteries shows the narrowing and the branches beyond it. A pressure measurement across the narrowing confirms that it is significant rather than merely visible.
- 4
Balloon angioplasty
A balloon matched to the healthy artery either side is inflated across the narrowing. Stents are generally avoided in a growing child because a stent does not grow with the artery, and are held in reserve.
- 5
Check and recovery
A completion angiogram and repeat pressure measurement document the result. The child recovers on the paediatric ward with the groin observed and blood pressure monitored.
Recovery
Most children stay one night, with flat bed rest for a few hours and a small bruise at the groin. Blood pressure often falls within days but can take weeks to settle, and medication is reduced by the nephrology team rather than stopped at home — never adjust it yourself. Follow-up Doppler and blood pressure checks are arranged, typically at a few weeks and then at intervals. Restenosis can occur, particularly with arteritis, and a repeat angioplasty is usually straightforward if it does.
Discuss this procedure
Private consultations and procedures are at Andalusia Hospitals, Maadi. Kasr Al-Ainy is Dr. El Ghobashy's academic post at Cairo University and does not take private cases.
Frequently asked questions
Will my child be able to stop blood pressure medication?
Often the dose or the number of drugs can be reduced, and some children come off treatment entirely. Whether that happens depends on the cause, how long the pressure has been high and whether both kidneys are involved. It is a realistic goal but not a promise, and any reduction is made by the nephrology team on measured readings.
Will a stent be put in?
Usually not. A stent is a fixed diameter and a child's artery is still growing, so a stent placed now can become the narrowing later. Balloon angioplasty alone is the first choice, and stents are reserved for specific situations such as a vessel that tears or recoils immediately, discussed with you beforehand.
Can the narrowing come back?
Yes, and it is looked for rather than assumed away — this is why follow-up Doppler and blood pressure checks are arranged. Restenosis is more likely when the cause is an arteritis that is still active. If it recurs, repeat angioplasty is generally possible.
What are the risks?
The main ones are bruising or injury at the groin puncture, damage to the artery being treated, and the small contrast and radiation exposures. Serious complications are uncommon in experienced hands, and are weighed against years of uncontrolled hypertension, which damages the heart, brain, eyes and the kidneys themselves.
Other procedures
This page is general information, not medical advice for an individual. Whether a procedure suits you depends on your imaging, your history and an in-person assessment.