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Chronic hypernatremia associated with holoprosencephaly
Insights
Two young girls with chronic hypernatremia and holoprosencephaly exhibited abnormal antidiuretic hormone (ADH) regulation. Their bodies struggled to manage water balance, indicating complex hormonal dysregulation in this rare condition.
Area of Science:
- Pediatric Endocrinology
- Neurodevelopmental Disorders
- Nephrology
Background:
- Chronic hypernatremia in children can indicate underlying hormonal or developmental issues.
- Holoprosencephaly is a congenital disorder affecting brain development and often associated with endocrine dysfunction.
Observation:
- Two pediatric patients presented with chronic hypernatremia, holoprosencephaly features, and abnormal responses to water deprivation and saline challenges.
- Water deprivation tests confirmed antidiuretic hormone (ADH) secretion, but regulation appeared impaired.
Findings:
- Abnormal osmotic regulation of ADH secretion was confirmed via radioimmunoassay in one patient.
- Incomplete volume regulation of ADH secretion was suggested by water retention during chronic water loading.
Implications:
- These findings highlight the complex interplay between brain development, osmotic balance, and ADH regulation in holoprosencephaly.
- Further research is needed to understand and manage fluid and electrolyte disturbances in children with these co-occurring conditions.
Abstract:
Two patients ( 1 7/12-year-old and 1 11/12-year-old girls) with chronic hypernatremia were studied. Neuroradiological findings and mildine facial defects showed characteristic features of holoprosencephaly. Water deprivation tests showed clear evidence of antidiuretic hormone (ADH) secretion. The responses to hypertonic saline infusion and acute water loading were abnormal. In one case, the impaired osmotic regulation of ADH secretion was demonstrated by measuring urinary ADH by a radioimmunoassay. In this case, the volume regulation of ADH secretion seemed to be also incomplete since chronic water loading for a period of six days induced water retension.