Dichoptic Stimulation Improves Detection of Glaucoma with Multifocal Visual Evoked Potentials

2007 ◽  
Vol 48 (10) ◽  
pp. 4590 ◽  
Author(s):  
Hemamalini Arvind ◽  
Alexander Klistorner ◽  
Stuart Graham ◽  
John Grigg ◽  
Ivan Goldberg ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Multifocal Visual Evoked Potentials ◽  
Visual Evoked

scholarly journals Using advanced analysis of multifocal visual-evoked potentials to evaluate the risk of clinical progression in patients with radiologically isolated syndrome

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
J. M. Miguel ◽  
M. Roldán ◽  
C. Pérez-Rico ◽  
M. Ortiz ◽  
L. Boquete ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Area Under The Curve ◽  
Multifocal Visual Evoked Potentials ◽  
Radiologically Isolated Syndrome ◽  
Advanced Analysis ◽  
The Time Domain ◽  
Visual Evoked

AbstractThis study aimed to assess the role of multifocal visual-evoked potentials (mfVEPs) as a guiding factor for clinical conversion of radiologically isolated syndrome (RIS). We longitudinally followed a cohort of 15 patients diagnosed with RIS. All subjects underwent thorough ophthalmological, neurological and imaging examinations. The mfVEP signals were analysed to obtain features in the time domain (SNRmin: amplitude, Latmax: monocular latency) and in the continuous wavelet transform (CWT) domain (bmax: instant in which the CWT function maximum appears, Nmax: number of CWT function maximums). The best features were used as inputs to a RUSBoost boosting-based sampling algorithm to improve the mfVEP diagnostic performance. Five of the 15 patients developed an objective clinical symptom consistent with an inflammatory demyelinating central nervous system syndrome during follow-up (mean time: 13.40 months). The (SNRmin) variable decreased significantly in the group that converted (2.74 ± 0.92 vs. 4.07 ± 0.95, p = 0.01). Similarly, the (bmax) feature increased significantly in RIS patients who converted (169.44 ± 24.81 vs. 139.03 ± 11.95 (ms), p = 0.02). The area under the curve analysis produced SNRmin and bmax values of 0.92 and 0.88, respectively. These results provide a set of new mfVEP features that can be potentially useful for predicting prognosis in RIS patients.

Multifocal visual-evoked potentials in patients with schizophrenia during treatment

2011 ◽  
Vol 23 (1) ◽  
pp. 31-34 ◽  
Author(s):  
Mariko Yamada ◽  
Eiichi Yukawa ◽  
Futoshi Taketani ◽  
Toyoaki Matsuura ◽  
Yoshiaki Hara
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Normal Subjects ◽  
Subject Group ◽  
Recording Apparatus ◽  
Multifocal Visual Evoked Potentials ◽  
Psychotropic Agents ◽  
Schizophrenic Patients ◽  
Conventional Perimetry ◽  
Visual Evoked

Aim: Investigation of responses of multifocal visual-evoked potentials (mfVEPs) in schizophrenic patients under treatment in whom no abnormality was detected on the conventional perimetry.Methods: Recordings of mfVEPs were performed in 31 schizophrenic patients and 30 normal subjects using a VERIS Junior Science recording apparatus (Mayo, Aichi, Japan). Responses from eight sites in each subject were divided into four quadrants (superior and inferior temporal quadrants, and superior and inferior nasal quadrants). In each quadrant, two response waves were grouped and averaged, and the latency and amplitude of main waveforms that appeared near 100 ms were evaluated.Results: The peak latency was about 7–9 ms prolonged and the amplitude was reduced by about 2–5 nV/deg2 in the schizophrenic patient group compared to those in the normal subject group, and significant differences were noted in both parameters in all quadrants.Conclusion: In schizophrenic patients under treatment with psychotropic agents, prolongation of the latency and amplitude reduction were noted in mfVEPs even though no abnormality was detected on the conventional perimetry.

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