Clinical scenario: Encephalopathy | Hypertension | Reduced renal blood flow
A 9-year-old boy is brought to the emergency department with severe headache, vomiting, generalized seizures, and altered consciousness. His blood pressure is 210/140 mmHg. Fundoscopy shows papilledema. Serum creatinine is normal, and urinalysis is unremarkable. Renal Doppler ultrasound demonstrates markedly reduced blood flow in the left renal artery.
What is the most appropriate definitive treatment?
A. ACE inhibitor alone
B. Balloon angioplasty
C. Hemodialysis
D. Intravenous furosemide
E. Oral nifedipine
Correct answer & Explanation:
Correct answer: B. Balloon angioplasty
Explanation:
This child has hypertensive encephalopathy secondary to renovascular hypertension caused by renal artery stenosis.
Management consists of:
- Immediate blood pressure reduction with intravenous antihypertensives (e.g., nicardipine or labetalol) to treat the hypertensive emergency.
- Definitive treatment by restoring renal blood flow, most commonly percutaneous transluminal balloon angioplasty, particularly in children with fibromuscular dysplasia.
Why the other options are incorrect:
- A. ACE inhibitor alone – May control BP temporarily but is not definitive and should be used cautiously in bilateral disease.
- C. Hemodialysis – Not indicated unless there is severe renal failure or refractory fluid/electrolyte abnormalities.
- D. Intravenous furosemide – Not the treatment for renovascular hypertension.
- E. Oral nifedipine – Inappropriate for a hypertensive emergency due to unpredictable BP reduction.
Key point:
A child with hypertensive encephalopathy, normal urinalysis, and renal artery stenosis has renovascular hypertension. After stabilization, balloon angioplasty is the preferred definitive treatment in most pediatric cases.
