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Related Experiment Videos

Hyponatremia due to sodium valproate

A J Branten1, J F Wetzels, A M Weber

  • 1Department of Medicine, University Hospital, Nijmegen, The Netherlands.

Annals of Neurology
|March 4, 1998
PubMed
Summary

Sodium valproate, an epilepsy medication, can cause hyponatremia (low sodium levels) by impairing water excretion. Monitor serum sodium levels when using high doses of this drug.

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Area of Science:

  • Nephrology
  • Neurology
  • Clinical Pharmacology

Background:

  • Hyponatremia is a common electrolyte imbalance.
  • Sodium valproate is an antiepileptic drug used for various seizure disorders.
  • Henoch-Schönlein nephritis is a systemic vasculitis affecting the kidneys.

Observation:

  • A 50-year-old male with epilepsy on high-dose sodium valproate (2,000 mg/day) presented with hyponatremia (serum sodium 128 mEq/L).
  • Other causes of hyponatremia, including hypothyroidism and adrenal insufficiency, were excluded.
  • The patient had a history of Henoch-Schönlein nephritis.

Findings:

  • Water loading tests demonstrated a dose-dependent reduction in the ability to excrete free water.
  • This impairment in water excretion was attributed to sodium valproate.
  • The findings suggest a syndrome resembling the Syndrome of Inappropriate Antidiuretic Hormone secretion (SIADH)-like effect.

Implications:

  • Sodium valproate can induce hyponatremia, potentially through an SIADH-like mechanism.
  • Close monitoring of serum sodium levels is crucial for patients on high-dose sodium valproate therapy.
  • This highlights the importance of considering drug-induced electrolyte disturbances in clinical practice.

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