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Abstract #8843 Published in IGR 5-1
Investigation of multifocal visual evoked potential in normal subjects
Watanabe DTeikyo Medical Journal 2003; 26: 127-139
Characteristics of multifocal visual evoked potential (mfVEP), which has been reported to be able to extract local responses, were studied in 12 normal subjects. The dart board pattern consisted of 60 elements, each of which had a 4 x 4 checker board pattern, was used for the stimulating field. Since waveforms of VEP are influenced by the electrode position, responses were conducted from four different positions. The local response was extracted in all experiments from most of the 60 areas. When the responses from 12 subjects were compared in each local area, the specific areas in which all responses were quite similar, and the areas in which this was not so, were found. The reproducibility of local response in the individuals was excellent. Both interindividual variability and intraindividual reproducibility were reduced when the local responses were summed in four quadrants. It was suggested that bipolar leads that put an active electrode above the inion and an indifferent electrode at the inion are suitable for usual recordings. Despite some problems, the efficacy of mfVEP could be improved by selecting analysis methods relevant for the purpose, and mfVEP could be applied clinically for objective functional evaluation in optic nerve and visual pathway diseases, amblyopia and glaucoma.LA: Japanese
Dr. D. Watanabe, Department of Ophthalmology, Teikyo University School of Medicine, Chiba, Japan
Classification:
6.7 Electro-ophthalmodiagnosis (Part of: 6 Clinical examination methods)
