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Monocular pattern-shift visual evoked potentials in hemispheric strokes.

N P Verma, K A Kooi, J Gilroy

    Electroencephalography and Clinical Neurophysiology
    |September 1, 1984
    PubMed
    Summary
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    Unilateral non-hemorrhagic hemispheric infarction patients show visual pathway dysfunction. Pattern-shift visual evoked potentials revealed significant differences in P100 latency and amplitude compared to control groups.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Clinical Neurology

    Background:

    • Unilateral non-hemorrhagic hemispheric infarction can affect visual pathways.
    • Assessing anterior visual pathway function is crucial for stroke patients.

    Purpose of the Study:

    • To investigate anterior visual pathway dysfunction in patients with unilateral non-hemorrhagic hemispheric infarction.
    • To compare visual evoked potentials between stroke patients and control groups.

    Main Methods:

    • Monocular pattern-shift visual evoked potentials (VEPs) were recorded.
    • Three groups were studied: stroke patients, patient controls (CGI), and healthy elderly volunteers (CGII).
    • Exclusion criteria included ocular conditions that could affect VEPs.

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    Main Results:

    • Stroke patients exhibited significantly greater interocular P100 latency differences compared to controls (P < 0.01).
    • The P100 amplitude ratio was significantly different in stroke patients (P < 0.02).
    • P100 latency was significantly longer for ocular stimulation ipsilateral to infarction (P < 0.01) and contralateral (P < 0.05) compared to controls.

    Conclusions:

    • Pattern-shift VEPs demonstrate evidence of anterior visual pathway dysfunction in stroke patients.
    • The findings highlight the utility of VEPs in detecting subclinical visual pathway abnormalities post-stroke.