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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
Published on: May 12, 2019
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Visual-evoked potentials in patients with brain circulatory problems.
1Ophthalmology Clinic and Department of Ophthalmology, School of Medicine in Katowice, Medical University of Silesia in Katowice , Katowice , Poland.
The International Journal of Neuroscience
|June 6, 2014
Summary
Local brain circulatory problems, such as stroke, affect visual-evoked potentials (VEP). These VEP changes, including amplitude and latency differences, indicate brain ischemia and are seen in conditions like amaurosis fugax.
Area of Science:
- Neuroscience
- Ophthalmology
- Neurology
Background:
- Local brain circulatory problems can impact neurological function.
- Visual-evoked potentials (VEP) are sensitive indicators of visual pathway integrity.
Purpose of the Study:
- To investigate the influence of local brain circulatory issues on VEP.
- To determine if VEP can detect cerebral ischemia.
Main Methods:
- Thirty-eight patients with cerebrovascular conditions (hemianopsia, hemiparesis, amaurosis fugax) and 38 controls were studied.
- Pattern VEP (PVEP) and flash VEP (FVEP) were recorded monocularly.
- VEP parameters (N75, P100, N2, P2 latency and amplitude) were analyzed.
Main Results:
- Flash VEP showed prolonged P2 latency in stroke patients with hemiparesis compared to those with amaurosis fugax.
- All patient groups exhibited reduced VEP amplitude compared to controls.
- Significant interhemispheric differences in VEP latency (>3 ms) and amplitude (>30%) were found in all patient groups, unlike controls.
Conclusions:
- Local brain circulatory problems leading to ischemia cause interhemispheric VEP amplitude and latency alterations.
- VEP changes in amaurosis fugax patients suggest recurrent cerebral ischemia.
