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Non-Hyperammonemic valproate encephalopathy.

Omar Farooq1, Pervaiz M Zunga1, Mohd I Dar1

  • 1Internal Medicine SMHS hospital GMC Srinagar.

Annals of Neurosciences
|September 11, 2014
PubMed
Summary
This summary is machine-generated.

Valproate, an anti-seizure medication, can cause encephalopathy even without high ammonia levels. This case highlights non-hyperammonemic valproate encephalopathy, suggesting alternative mechanisms for this neurological condition.

Keywords:
EEGHypothyroidismValproic acid

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Area of Science:

  • Neurology
  • Clinical Toxicology

Background:

  • Valproate is a widely used antiepileptic drug.
  • Encephalopathy is a known, albeit rare, complication of valproate therapy, typically associated with hyperammonemia.

Observation:

  • A young male with a seizure disorder on multiple antiepileptic drugs presented with altered sensorium and gait unsteadiness after a dose increase of sodium valproate.
  • Initial investigations, including blood work, CSF analysis, and MRI brain, were unremarkable for acute causes.
  • Electroencephalogram (EEG) revealed diffuse encephalopathy, prompting suspicion of valproate-induced neurotoxicity.

Findings:

  • Serum valproate levels were elevated, while serum ammonia levels remained within the normal range.
  • Discontinuation of valproate led to rapid clinical improvement and EEG normalization.
  • The patient was diagnosed with non-hyperammonemic valproate encephalopathy.

Implications:

  • This case underscores the existence of valproate-induced encephalopathy independent of hyperammonemia.
  • It suggests that alternative pathophysiological mechanisms may be involved in valproate neurotoxicity.
  • Clinicians should consider valproate encephalopathy in patients with unexplained neurological decline, even with normal ammonia levels.