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[Posttraumatic neurogenic hyponatremia with late onset]
La Revue De Medecine Interne
|June 1, 1984
Summary
A severe head injury led to inappropriate antidiuretic hormone (ADH) secretion in a young man, causing seizures. His ADH levels remained high despite normal water balance, indicating a reset osmolality threshold.
Area of Science:
- Endocrinology
- Neurology
- Nephrology
Background:
- Severe head injury can disrupt hormonal regulation.
- Syndrome of Inappropriate Antidiuretic Hormone (SIADH) secretion is a known complication.
Observation:
- A 26-year-old man presented with SIADH and seizures post-head injury.
- He experienced seizures after consuming non-alcoholic beverages.
- Standard water loading tests were negative, but sorbitol infusion was positive.
Findings:
- Plasma antidiuretic hormone (ADH) levels were inappropriately high for plasma osmolality.
- Dynamic testing suggested a reset osmolality threshold for ADH inhibition.
- The threshold for inhibiting ADH secretion was likely lower than normal.
Implications:
- This case highlights a potential long-term neuroendocrine consequence of severe head trauma.
- Understanding the reset osmolality threshold is crucial for managing SIADH.
- Further research into ADH regulation post-brain injury is warranted.