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Pattern-reversal visual evoked potentials in photosensitive epilepsy.

E Faught, S I Lee

    Electroencephalography and Clinical Neurophysiology
    |April 1, 1984
    PubMed
    Summary
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    Photosensitive epilepsy patients show altered visual evoked potentials (VEPs). Valproic acid treatment can normalize these pattern-reversal VEPs, aiding in objective monitoring of treatment effectiveness.

    Area of Science:

    • Neuroscience
    • Clinical Neurology
    • Ophthalmology

    Background:

    • Epilepsy is a neurological disorder characterized by recurrent seizures.
    • Photosensitive epilepsy is a subtype triggered by visual stimuli, such as flashing lights.
    • Visual evoked potentials (VEPs) are electrophysiological measures of the visual pathway's function.

    Purpose of the Study:

    • To investigate pattern-reversal VEPs in epileptic patients with photoparoxysmal responses.
    • To compare VEPs between photosensitive and non-photosensitive epileptic patients and normal controls.
    • To assess the effect of valproic acid on VEPs in epilepsy management.

    Main Methods:

    • Recorded pattern-reversal VEPs in 18 epileptic patients with EEG photoparoxysmal responses.
    • Grouped patients based on seizure precipitation by environmental light or television viewing.

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  • Conducted longitudinal studies on 8 patients treated with valproic acid.

    • Main Results:

    • Photosensitive patients exhibited shorter P2 latency in VEPs compared to controls, particularly television-sensitive individuals.
    • Effective valproic acid treatment correlated with lengthened P2 latency and decreased VEP amplitude.
    • VEP measurements showed overlap with normal values, limiting diagnostic sensitivity for photosensitivity.

    Conclusions:

    • Pattern-reversal VEPs reveal abnormalities in photosensitive epilepsy.
    • Valproic acid may normalize VEPs, suggesting neurochemical effects on the visual cortex.
    • Longitudinal VEP studies offer objective measures for monitoring treatment response in photosensitive epilepsy.