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Renal vein renin measurements in children with hypertension
Insights
Measuring renal venous renin activity in children with hypertension accurately identified surgical candidates. Successful surgery normalized blood pressure in children with significant renin differences between kidneys.
Area of Science:
- Pediatric Nephrology
- Cardiovascular Physiology
- Surgical Intervention
Background:
- Hypertension in children is a significant clinical challenge.
- Identifying the underlying cause, particularly renovascular hypertension, is crucial for effective management.
- Renin-producing tumors or renal artery stenosis can cause secondary hypertension.
Purpose of the Study:
- To evaluate the utility of renal venous renin activity (RVRA) measurements in diagnosing the cause of hypertension in pediatric patients.
- To determine the feasibility of RVRA sampling in young children.
- To correlate RVRA findings with treatment outcomes and surgical success.
Main Methods:
- Retrospective analysis of 50 children with hypertension undergoing RVRA measurements.
- Inclusion of main renal vein and segmental renal vein sampling.
- Correlation of renin ratios with surgical intervention and blood pressure normalization.
- Assessment of feasibility in children as young as 15 months.
Main Results:
- Main renal vein sampling was feasible even in very young children (≥15 months).
- A main vein renin ratio >1.5 predicted successful blood pressure normalization after surgery.
- Lower renin ratios (<1.5) were associated with bilateral disease or normal kidneys.
- Segmental sampling provided additional diagnostic information, identifying localized renin production.
- RVRA measurements aided in managing hypertension in pediatric renal transplant recipients.
Conclusions:
- RVRA measurement is a valuable tool for diagnosing and managing pediatric hypertension, particularly renovascular forms.
- The procedure is feasible and safe in young children.
- Identifying asymmetric renin secretion via RVRA ratios can guide surgical intervention and improve outcomes.
- Segmental vein sampling enhances diagnostic accuracy for localized renin overproduction.
Abstract:
Renal venous renin activity was measured in 50 children with hypertension. Main renal vein and segmental renal vein sampling was feasible in children as young as 15 months. In all cases in which there was a clear difference in renin secretion between the kidneys--that is, a main vein renin ratio above 1.5--surgery, when undertaken, successfully restored normal blood pressure. Most of the children with main renal vein renin ratios below 1.5 had bilateral disease or apparently normal kidneys. Segmental renal vein sampling contributed useful information additional to that provided by main renal vein measurements and permitted identification of local sources of renin production. In children with renal transplants who developed hypertension renal vein renin measurements helped in determining the cause and facilitating the management of the raised blood pressure.