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Hyponatremia in intracranial disorders.
M J Coenraad1, A E Meinders, J C Taal
1Department of General Internal Medicine, Leiden University Medical Center, C1-R41, Albinusdreef 2, P.O. Box 9600, 2300 RC, Leiden, The Netherlands.
The Netherlands Journal of Medicine
|March 14, 2001
Summary
Hyponatremia after brain injury is often caused by cerebral salt wasting syndrome (CSW), not the syndrome of inappropriate ADH secretion (SIADH). Treatment involves sodium and fluid replacement for CSW to prevent neurological issues.
Area of Science:
- Neurology
- Endocrinology
- Nephrology
Background:
- Hyponatremia is a frequent complication of intracranial disorders.
- Both rapid drops in serum sodium and rapid correction can cause neurological symptoms.
- Distinguishing between SIADH and CSW is critical for appropriate management.
Purpose of the Study:
- To differentiate between SIADH and CSW in patients with intracranial disorders.
- To clarify the underlying mechanisms of hyponatremia in these conditions.
- To guide appropriate therapeutic strategies based on the diagnosis.
Main Methods:
- Review of literature on hyponatremia associated with intracranial disorders.
- Comparison of the clinical and biochemical features of SIADH and CSW.
- Analysis of treatment outcomes for both conditions.
Main Results:
- SIADH involves water retention due to inappropriate ADH release, leading to dilutional hyponatremia.
- CSW is characterized by primary natriuresis, causing hypovolemia and sodium loss.
- Literature suggests CSW is the more common cause of hyponatremia in intracranial diseases.
Conclusions:
- SIADH requires fluid restriction.
- CSW necessitates sodium and water administration.
- Hyponatremia in intracranial disorders often indicates CSW, warranting salt and fluid supplementation.