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Monocular pattern-shift visual evoked potentials in hemispheric strokes
Electroencephalography and Clinical Neurophysiology
|September 1, 1984
Summary
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.
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.