Increased sodium requirement following early postnatal surgical correction of congenital uropathies in infants

Area of Science:

• Pediatric Surgery
• Nephrology
• Endocrinology

Background:

• Infants with severe obstructive uropathy or grade 5 vesico-ureteral reflux often present with complex medical needs.
• Surgical correction in early infancy can lead to significant physiological stress and potential complications.
• Aldosterone plays a crucial role in electrolyte balance, particularly in the context of renal and urinary tract disorders.

Purpose of the Study:

• To investigate serum electrolyte equilibrium and plasma aldosterone concentrations in infants undergoing surgical correction for severe uropathies.
• To identify the impact of surgical correction on aldosterone levels and electrolyte balance.
• To evaluate the efficacy of sodium chloride supplementation in preventing metabolic complications.

Main Methods:

• Monitoring serum electrolytes (sodium, potassium) and plasma aldosterone levels in 19 infants before and after surgical correction.
• Observing clinical outcomes including weight changes and signs of metabolic imbalance.
• Administering sodium chloride infusion (4 mEq/kg/day) to a subset of patients pre- and post-surgery.

Main Results:

• Elevated plasma aldosterone was noted in 8 patients pre-surgery and all patients post-surgery.
• Seven patients developed severe hyponatraemia and hyperkalaemia despite high aldosterone levels.
• Sodium chloride infusion effectively prevented metabolic imbalance in the treated infants.

Conclusions:

• Infants undergoing surgical correction for uropathies may experience significant aldosterone elevation post-operatively.
• High aldosterone levels do not always prevent hyponatraemia and hyperkalaemia in these infants.
• Adequate sodium intake, potentially through supplementation, is crucial for maintaining electrolyte balance and promoting growth in infants undergoing uropathy surgery.