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Water intoxication in normal infants: role of antidiuretic hormone in pathogenesis
Insights
Infants given dilute formula developed water intoxication, a condition characterized by hyponatremia and neurological symptoms. Excessive arginine vasopressin release was identified as the cause, resolving with fluid restriction or saline.
Area of Science:
- Pediatric Medicine
- Endocrinology
- Nephrology
Background:
- Infants are susceptible to water intoxication due to immature renal function.
- Dilute formula feeding can lead to excessive water intake and electrolyte imbalances in infants.
Observation:
- Eight infants (2-5 months) presented with somnolence, irritability, seizures, and hypothermia after consuming dilute formula.
- All infants exhibited hyponatremia and decreased serum osmolality.
- Despite low serum osmolality, plasma arginine vasopressin and urinary osmolality were normal or elevated.
Findings:
- The study identified a syndrome of water intoxication in infants due to dilute formula.
- Elevated arginine vasopressin levels were implicated in the pathogenesis of the syndrome.
- Infants showed rapid improvement with fluid restriction and/or 3% NaCl administration.
Implications:
- Highlights the critical importance of correct infant formula preparation.
- Suggests arginine vasopressin dysregulation in infant water intoxication.
- Informs clinical management of hyponatremia and water intoxication in infants.
Abstract:
Eight infants, 2 to 5 months of age, who were seen somnolence or irritability, seizures, and hypothermia are described. The symptoms developed following the ingestion of dilute formula. All infants were hyponatremic. Three patients were identified by the symptom complex and were evaluated prior to any therapeutic intervention. Plasma arginine vasopressin concentration and urinary osmolality were either normal or increased despite hyponatremia and decreased serum osmolality. These data, coupled with rapid biochemical and clinical improvement following fluid restriction and/or administration of 3% NaCl, strongly implicate the excessive release of arginine vasopressin in the pathogenesis of this syndrome of water intoxication.