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Related Experiment Videos

Acute visual dysfunction following phenytoin-induced toxicity.

Archana Thakral1, Radha Shenoy, Dirk Deleu

  • 1Department of Ophthalmology, Sultan Qaboos University Hospital, Muscat, Sultanate of Oman.

Acta Neurologica Belgica
|March 11, 2004
PubMed
Summary

Acute phenytoin toxicity can cause sudden visual disturbances, including blurred vision and color blindness. This previously unreported phenomenon highlights the importance of monitoring visual function in patients with elevated phenytoin levels.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Clinical Toxicology

Background:

  • Epilepsy management often involves antiepileptic drugs like phenytoin.
  • Phenytoin is commonly used for status epilepticus and seizure control.
  • High serum concentrations of phenytoin can lead to various toxic effects.

Observation:

  • A 19-year-old male with epilepsy experienced blurred vision and xanthopsia after a phenytoin loading dose.
  • Ophthalmic examinations revealed color blindness, visual field constriction, and abnormal visually evoked potentials.
  • Toxic serum phenytoin levels were confirmed, with no other identifiable cause for the visual dysfunction.

Findings:

  • Discontinuation of phenytoin led to partial visual recovery.
  • While visually evoked potentials normalized over time, electroretinography indicated persistent cone and rod dysfunction.

Related Experiment Videos

  • This case demonstrates a novel association between phenytoin toxicity and acute visual impairment.

    • Implications:

    • Clinicians should consider phenytoin toxicity in patients presenting with acute visual disturbances.
    • Monitoring visual function may be crucial in patients receiving phenytoin, especially at high doses.
    • This finding expands the known spectrum of phenytoin-induced neurotoxicity.