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Related Experiment Videos

[Visual field changes secondary to vigabatrin treatment].

J A Mauri-Llerda1, C Iñiguez, C Tejero-Juste

  • 1Servicio de Neurología, Hospital Clínico Universitario Lozano Blesa, Zaragoza, España. jamauri@retemail.es

Revista De Neurologia
|February 24, 2001
PubMed
Summary

Long-term vigabatrin treatment for epilepsy is linked to a high prevalence of visual field defects. Early detection through serial campimetry is crucial, as clinical signs often appear late.

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Area of Science:

  • Neuro-ophthalmology
  • Epileptology
  • Pharmacovigilance

Background:

  • Vigabatrin is an effective antiepileptic drug (AED) used for partial seizures.
  • It functions by irreversibly inhibiting GABA-transaminase, increasing GABA levels.
  • Recent reports indicate potential visual field alterations in patients on vigabatrin therapy.

Observation:

  • This study investigated the prevalence and characteristics of visual field changes in adult epilepsy patients on long-term vigabatrin.
  • Ophthalmological examinations included visual field testing (campimetry), funduscopy, visual evoked potentials (VEPs), and electroretinography (ERG).

Findings:

  • 60% of patients (6 out of 10) exhibited campimetric alterations, with 20% showing severe defects.
  • Optic nerve pallor was observed in 20% of patients.

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  • ERG abnormalities correlated with severe field defects; VEPs remained normal in all cases.

    • Implications:

    • Long-term vigabatrin use is associated with a high incidence of visual field defects.
    • Ophthalmological signs may not be apparent until advanced stages of visual field loss.
    • Regular campimetric monitoring is essential for early detection and management of vigabatrin-induced visual field alterations.