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Pattern visual evoked potentials and flash electroretinogram in clinically definite multiple sclerosis.

F Pierelli, G Pozzessere, E Stefano

    European Neurology
    |January 1, 1985
    PubMed
    Summary
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    Multiple sclerosis patients show significant visual pathway abnormalities. Pattern visual evoked potential (VEP) tests revealed widespread issues, while electroretinogram (ERG) changes were less common but indicated potential optic nerve involvement.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Clinical Neurology

    Background:

    • Multiple sclerosis (MS) is a demyelinating disease affecting the central nervous system.
    • Visual pathway involvement is common in MS, impacting vision and quality of life.

    Purpose of the Study:

    • To investigate visual pathway function in patients with definite multiple sclerosis.
    • To compare the sensitivity of pattern visual evoked potential (VEP) and flash electroretinogram (ERG) in detecting MS-related visual dysfunction.

    Main Methods:

    • Utilized pattern visual evoked potential (VEP) and flash electroretinogram (ERG) recordings.
    • Examined a cohort of 15 patients diagnosed with definite multiple sclerosis.
    • Analyzed VEP and ERG data for abnormalities in eyes with a history of visual pathway involvement.

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    Main Results:

    • A high percentage of eyes (93.3%) exhibited abnormal VEPs, indicating significant visual pathway disruption.
    • A lower percentage of eyes (20%) showed abnormal ERGs.
    • The primary ERG abnormality observed was an increased b wave voltage, particularly with red flash stimuli, suggesting potential involvement of centrifugal optic nerve fibers.

    Conclusions:

    • Pattern VEP is a highly sensitive tool for detecting visual pathway involvement in multiple sclerosis.
    • ERG abnormalities, though less frequent, may point to specific functional changes in retinal cells possibly due to altered optic nerve input.
    • Findings suggest a potential role for inhibitory centrifugal optic nerve fibers in the observed ERG alterations in MS patients.