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Hyporeninemic hypoaldosteronism in infancy: a familial disease
Insights
Two male siblings presented with hyporeninemic hypoaldosteronism, characterized by salt wasting and low sodium. Congenital deficiencies in renin or angiotensinogen are suggested as the cause.
Area of Science:
- Endocrinology
- Pediatrics
- Genetics
Background:
- Hyporeninemic hypoaldosteronism (HHA) is a rare endocrine disorder.
- It is characterized by impaired renin production and aldosterone deficiency.
- This can lead to electrolyte imbalances like hyponatremia and hyperkalemia.
Observation:
- Two male siblings presented with recurrent salt wasting and hyponatremia.
- The elder sibling exhibited growth retardation, while the younger had hyperkalemia.
- Both demonstrated severe hypoaldosteronism unresponsive to ACTH stimulation, ruling out primary adrenal insufficiency.
Findings:
- Low plasma renin activity (PRA) was observed in both siblings compared to age-matched controls.
- The elder sibling also had decreased total renin, a low inactive-to-total renin ratio, and subnormal angiotensinogen levels.
- The father exhibited low plasma angiotensinogen, suggesting a potential genetic link.
Implications:
- These findings suggest a congenital deficiency in renin activity and/or angiotensinogen production as the primary cause of HHA in this family.
- Early diagnosis and management are crucial for preventing severe complications in affected infants.
- Further research into the genetic basis of renin and angiotensinogen deficiency is warranted.
Abstract:
Hyporeninemic hypoaldosteronism was found in two male siblings with urinary salt wasting and low plasma sodium levels. The eldest, aged 1 yr, had growth retardation, with hyponatremia and normal plasma potassium levels. The second, aged 2 months, had low plasma sodium and high plasma potassium levels. Both were severely and repeatedly hypoaldosteronemic. Primary adrenal deficiency was excluded by ACTH testing, which showed a good aldosterone rise and normal responses of other steroids. Both children had low PRA compared to that in age-matched normal subjects. The eldest sibling also had decreased total renin, low inactive to total renin ratio, and a subnormal level of angiotensinogen. The father had low plasma angiotensinogen levels. Congenital deficiency of renin activity and/or angiotensinogen production is suggested as the primary abnormality.