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Low-renin hypertension in young infants
Insights
Plasma renin activity (PRA) measurement is often unhelpful in neonates due to high baseline levels. However, low PRA is crucial for diagnosing dexamethasone-suppressible hyperaldosteronism in hypertensive infants.
Area of Science:
- Pediatric Endocrinology
- Nephrology
- Hypertension Research
Background:
- Plasma renin activity (PRA) is typically elevated in neonates, complicating hypertension diagnosis.
- Numerous physiological and therapeutic factors can further increase neonatal PRA.
- Standard PRA measurement is often uninformative for identifying hypertension causes in neonates.
Observation:
- Two infants, aged 4 and 5 months, presented with sustained hypertension.
- Both infants exhibited low PRA levels.
- These low PRA levels were secondary to dexamethasone-suppressible hyperaldosteronism.
Findings:
- Low PRA was a critical diagnostic indicator in these cases.
- Dexamethasone-suppressible hyperaldosteronism was confirmed as the cause of hypertension.
- The diagnostic utility of PRA measurement is highlighted in specific conditions.
Implications:
- Dexamethasone-suppressible hyperaldosteronism should be considered in infants with hypertension, normal genitalia, and low PRA.
- This finding underscores the importance of evaluating PRA in specific pediatric hypertension contexts.
- Early diagnosis of dexamethasone-suppressible hyperaldosteronism allows for targeted treatment and management.
Abstract:
Plasma renin activity (PRA) in neonates is significantly higher than in older infants and children and may increase as a result of numerous physiologic or therapeutic factors. For these reasons, the measurement of PRA is not usually helpful in establishing the cause of hypertension in neonates. In conditions that suppress renin release, however, measurement of PRA can be most useful. Herein, we describe two infants (ages 4 and 5 months, respectively) with sustained hypertension and low PRA secondary to dexamethasone-suppressible hyperaldosteronism. Low PRA was essential in establishing this diagnosis in both patients. Dexamethasone-suppressible hyperaldosteronism should be considered in hypertensive infants who have normal genitalia and low PRA.