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Persistent hyponatremia and inappropriate antidiuretic hormone secretion in children with extensive burns
Insights
Severe burns in children can cause hyponatremia (low sodium) and syndrome of inappropriate antidiuretic hormone (SIADH) secretion. This condition may stem from prolonged pain, anxiety, or fever post-burn.
Area of Science:
- Pediatric critical care medicine
- Endocrinology
- Burn management
Background:
- Severe burns in children present complex physiological challenges.
- Hyponatremia and fluid balance disturbances are critical concerns post-burn.
Observation:
- Three pediatric burn patients (2.5-5.5 years) with 30-45% body surface area burns developed hyponatremia and hypotonicity on days 5-6 post-injury.
- Patients exhibited inappropriately concentrated urine and, in one case, excessive thirst.
- Persistent respiratory alkalosis coincided with hyponatremia, with no signs of dehydration and normal to high plasma volumes.
Findings:
- The clinical presentation suggests the syndrome of inappropriate antidiuretic hormone (SIADH) secretion.
- The absence of typical SIADH-inducing conditions points to burn-related factors.
Implications:
- Prolonged pain, anxiety, and/or pyrexia are postulated as potential triggers for SIADH in pediatric burn patients.
- This highlights the need for careful monitoring of electrolyte and fluid balance in severely burned children.
- Understanding these non-standard SIADH triggers is crucial for effective clinical management and treatment strategies.
Abstract:
Three children aged 2 1/2 to 5 1/2 yr, with burns covering 30%--45% of body surface area, developed hyponatremia and serum hypotonicity on the 5th--6th day following the burn injury. The hyponatremia persisted for 10--15 days. During this period, all three passed inappropriately concentrated urines. One child also demonstrated marked and inappropriate thirst. All three children demonstrated persistent respiratory alkalosis, which appeared and disappeared concomitantly with the hyponatremia. There were no signs of dehydration, and plasma volumes, measured in two children, were normal to high. These children are believed to show evidence of inappropriate antidiuretic hormone (ADH) secretion. In the absence of those conditions known to produce this syndrome, it is postulated that in these children it may have resulted from prolonged pain, anxiety, and/or pyrexia.