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Imaging in systemic hypertension in paediatrics
1Hospital for Sick Children, London, UK.
Insights
Pediatric hypertension imaging focuses on kidney causes. Doppler ultrasound and radioisotope studies are key, with less invasive methods prioritized for diagnosing renovascular disease.
Area of Science:
- Pediatric Radiology
- Nephrology
- Diagnostic Imaging
Background:
- Systemic hypertension in children often originates from kidney-related issues.
- Accurate diagnosis is crucial for effective management and preventing long-term complications.
Purpose of the Study:
- To outline an optimal imaging strategy for evaluating pediatric hypertension.
- To determine the most effective and least invasive diagnostic pathway.
Main Methods:
- Recommended initial imaging includes Doppler ultrasound followed by a radioisotope study (e.g., 99mTc-DMSA).
- Intravenous urography is generally not indicated for most pediatric cases.
- Advanced techniques like arteriography and renal vein renin sampling are reserved for select patients.
Main Results:
- The combination of Doppler ultrasound and radioisotope imaging resolves most diagnostic challenges in pediatric hypertension.
- Minimally invasive procedures with low radiation exposure are emphasized.
- Angiotensin-converting enzyme (ACE) inhibition may aid in noninvasive diagnosis of renovascular disease.
Conclusions:
- A stepwise, minimally invasive imaging approach is recommended for pediatric hypertension.
- Doppler ultrasound and radioisotope studies are the cornerstone of initial evaluation.
- Selective use of high-radiation or invasive techniques is appropriate for specific clinical scenarios.
Abstract:
The role of imaging is to establish the cause of systemic hypertension, the main focus being the kidneys. All children require a Doppler ultrasound examination followed by a radioisotope study, usually 99mTc-DMSA. This combination will resolve most clinical situations. There is no role for the intravenous urogram in the majority of children. Arteriography and renal vein renin sampling are reserved for a small proportion of children. Imaging should always start with the least invasive procedure with the lowest radiation burden and high radiation techniques reserved for selected cases. The use of ACE inhibition may allow the diagnosis of renovascular disease in paediatrics noninvasively.