scholarly journals Visual Evoked Potentials for Detecting Visual Pathway Abnormality

2021 ◽  
Vol 13 (2) ◽  
pp. 21-27
Author(s):  
Soo-Hyun Park ◽  
Nam-Hee Kim
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Visual Pathway ◽  
Visual Evoked

Pattern-reversal visual evoked potentials in patients with hydrocephalus

1985 ◽  
Vol 62 (2) ◽  
pp. 234-237 ◽  
Author(s):  
Shakir M. Alani
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Right Hemisphere ◽  
Visual Pathway ◽  
Pattern Reversal ◽  
Field Stimulation ◽  
Content Type ◽  
Clinical Methods ◽  
The Right ◽  
Visual Evoked

✓ Pattern-reversal visual evoked potentials (VEP's) in response to whole- and half-field stimulation were studied in 10 patients with hydrocephalus. Abnormalities consistent with optic nerve dysfunction were recorded in four patients. Two patients had response asymmetry to half-field stimulation, which suggested dysfunction of the visual pathway in the right hemisphere. The remaining four patients had normal responses. Measurement of VEP's was repeated after the surgical treatment of hydrocephalus in four patients, and showed marked improvement in two of the three patients with preoperative abnormalities. This study suggests that, in patients with hydrocephalus, VEP's are more sensitive than clinical methods in detecting visual pathway dysfunction and that they can be useful in the follow-up monitoring of surgically treated hydrocephalic patients.

Congenital absence of optic chiasm: demonstration of an uncrossed visual pathway using monocular flash visual evoked potentials

2006 ◽  
Vol 113 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Malcolm C. Brown ◽  
Caroline L. Southern ◽  
Arangasamy Anbarasu ◽  
Stephen B. Kaye ◽  
Anthony C. Fisher ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Visual Pathway ◽  
Optic Chiasm ◽  
Congenital Absence ◽  
Flash Visual Evoked Potentials ◽  
Visual Evoked

Functional Monitoring for Visual Pathway Using Real-time Visual Evoked Potentials and Optic-radiation Tractography

2005 ◽  
Vol 57 (suppl_1) ◽  
pp. 121-127 ◽  
Author(s):  
Kyousuke Kamada ◽  
Tomoki Todo ◽  
Akio Morita ◽  
Yoshitaka Masutani ◽  
Shigeki Aoki ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Diffusion Tensor ◽  
Visual Pathway ◽  
Optic Radiation ◽  
Neurosurgical Planning ◽  
Neuronavigation System ◽  
Functional Neuronavigation ◽  
Visual Evoked

Abstract OBJECTIVE: It has been difficult to obtain anatomic and functional information about the visual pathway during neurosurgical operations. The aim of this study was to combine the information of the visual evoked potentials (VEPs) and the anatomic navigation of the optic radiation by diffusion tensor imaging-based tractography for functional monitoring of the visual pathway. METHODS: The subjects were two patients with brain lesions adjacent to the visual pathway. Diffusion tensor imaging-based tractography of the optic radiation was performed by selecting appropriate regions of interest and by fractional anisotropy. During surgery, cortical VEPs were recorded continuously under general anesthesia with sevoflurane. In Patient 2, the results of optic radiation tractography were imported to a neuronavigation system to better understand the spatial relationships between the lesions and the visual pathway (functional neuronavigation). RESULTS: In Patient 1, the lesion did not seem to be attached to the optic radiation, and VEP profiles remained stable during resection. In Patient 2, who had a lesion adjacent to the posterior horn of the lateral ventricle, VEPs suddenly diminished when resection reached the optic radiation as illustrated on the neuronavigation system. As a result, complete left hemianopia developed after surgery in Patient 2. CONCLUSION: We confirmed functional correlations of the results of diffusion tensor imaging-based tractography by monitoring intraoperative VEPs. The combination of continuous VEP and optic-radiation tractography is reliable to monitor the visual function and is helpful in performing neurosurgical planning near the visual pathway.

scholarly journals Visual Evoked Potentials as Potential Biomarkers of Visual Function in Patients with Primary Sjögren’s Syndrome

2021 ◽  
Vol 10 (18) ◽  
pp. 4196
Author(s):  
Edyta Dziadkowiak ◽  
Agata Sebastian ◽  
Malgorzata Wieczorek ◽  
Anna Pokryszko-Dragan ◽  
Marta Madej ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Visual Pathway ◽  
Primary Sjögren’S Syndrome ◽  
Implicit Time ◽  
Primary Sjogren’S Syndrome ◽  
The Central Nervous System ◽  
Visual Evoked

Visual evoked potentials (VEP) are changes in potentials that arise in the central nervous system. In the interpretation of the VEP test results, it is assumed that the elongation of the latency time is caused by the demyelination of the nerve fibers, and the axon damage is responsible for the decrease in the amplitude. The observed VEP deviations are not specific for specific diseases, but indicate disturbances in visual conductivity. VEP may play a diagnostic role in the early detection of visual involvement. The aim of the study was the functioning of visual pathway assessment on the basis of visual evoked potentials (VEP) examination, in patients with primary Sjögren’s Syndrome (pSS), without focal symptoms of central nervous system disorder. The effect of disease activity, as assessed by clinical parameters and antibody levels (anti-Ro52, SSA, and SSB), on the central nervous system was also evaluated. Thirty-two consecutive patient with pSS (31 females, 1 male) were included in the study. VEP was performed at baseline, and after 6 (T6) years. Their results were compared longitudinally between the baseline and T6, depending on the duration of the disease and treatment. The immunological activity of pSS was also analyzed. The group of patients showed a significant prolongation of the P100 implicit time (105.5 ± 5.1 vs. 100.6 ± 3.9; p = 0.000) and a significant higher the P100-N145 amplitude (12.3 ± 4.1 vs. 9.4 ± 3.0; p = 0.000). Abnormalities in electrophysiological parameters of VEP at baseline correlated with presentation of anti-Ro52 antibodies and aching joints. At baseline, the P100 implicit time was shorter for the patients with pSS than for those at T6 (105.50 ± 5.1 vs. 109.37 ± 5.67; p = 0.002). pSS patients without CNS involvement presented with dysfunction of visual pathway, as revealed by VEP abnormalities. Relationships were found between VEP parameters and with present of anti-Ro52 antibodies and aching joints. VEP may be a useful method for assessment and monitoring of subclinical visual deficit in the course of pSS.

scholarly journals Optical coherence tomography and visual evoked potentials in pediatric MS

2017 ◽  
Vol 4 (4) ◽  
pp. e356 ◽  
Author(s):  
Amy T. Waldman ◽  
Grant T. Liu ◽  
Amy M. Lavery ◽  
Geraldine Liu ◽  
William Gaetz ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Visual Pathway ◽  
Pattern Reversal ◽  
Inner Plexiform Layer ◽  
Optical Coherence ◽  
History Of ◽  
Pediatric Onset ◽  
Visual Evoked

Objective:To determine the relative ability of optical coherence tomography (OCT) and pattern-reversal visual evoked potentials (pVEPs) to detect visual pathway involvement in pediatric-onset MS.Methods:Pediatric-onset MS participants (onset <18 years) and healthy controls (HCs) underwent OCT (Cirrus HD-OCT) and pVEPs. Retinal nerve fiber layer (RNFL), ganglion cell layer to inner plexiform layer (GCL-IPL), and P100 pVEP latency were measured. Generalized estimating equation models were used to compare the groups, adjusting for age and intereye correlations.Results:Twenty-four pediatric MS participants, 14 with a history of remote (>6 months) optic neuritis (ON) in one eye (8 participants) or both the eyes (6 participants), and 24 HCs were enrolled. RNFL thinning (<83 μm, 2 SDs below HC eyes) occurred in 50% of ON eyes vs 5% of non-ON eyes. Prolonged VEP latency (>109 msec) occurred in 58% of ON eyes and 55% of non-ON eyes. A clinical history of ON predicted RNFL (p < 0.001) and GCL-IPL thinning (p = 0.011), whereas prolonged pVEP latency in children with MS occurred independent of ON history.Conclusions:OCT and pVEPs provide complementary but distinct insights. OCT is sensitive to retinal changes in the context of clinical ON, whereas pVEPs are useful to detect disseminated lesions of the visual pathway in children with MS.

scholarly journals Effect of mechanical tactile noise on amplitude of visual evoked potentials: multisensory stochastic resonance

2015 ◽  
Vol 114 (4) ◽  
pp. 2132-2143 ◽  
Author(s):  
Ignacio Méndez-Balbuena ◽  
Nayeli Huidobro ◽  
Mayte Silva ◽  
Amira Flores ◽  
Carlos Trenado ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Stochastic Resonance ◽  
Visual Evoked Potentials ◽  
Gaussian Noise ◽  
Index Finger ◽  
Sensory Modality ◽  
Visual Pathway ◽  
Input Noise ◽  
The Brain ◽  
Visual Evoked

The present investigation documents the electrophysiological occurrence of multisensory stochastic resonance in the human visual pathway elicited by tactile noise. We define multisensory stochastic resonance of brain evoked potentials as the phenomenon in which an intermediate level of input noise of one sensory modality enhances the brain evoked response of another sensory modality. Here we examined this phenomenon in visual evoked potentials (VEPs) modulated by the addition of tactile noise. Specifically, we examined whether a particular level of mechanical Gaussian noise applied to the index finger can improve the amplitude of the VEP. We compared the amplitude of the positive P100 VEP component between zero noise (ZN), optimal noise (ON), and high mechanical noise (HN). The data disclosed an inverted U-like graph for all the subjects, thus demonstrating the occurrence of a multisensory stochastic resonance in the P100 VEP.

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