Document Detail

Multi-channel visual evoked potentials in early compressive lesions of the chiasm.
MedLine Citation:
PMID:  3168727     Owner:  NLM     Status:  MEDLINE    
The sensitivity of transient, pattern-reversal visual evoked potentials in the detection of early compressive lesions of the chiasm is controversial in the literature. There have been claims that the technique is capable of detecting an abnormality in the absence of any demonstrable visual field loss, and conversely that VEPs are not reliable for the detection of chiasmal lesions even when a bitemporal hemianopsia is clearly recordable. Using nine patients with pituitary adenoma we attempted to quantify the extent of visual field loss and correlate the diagnostic capabilities of topographically recorded potentials following full- and half-field stimulus presentations of various field and check sizes. Differential light thresholds were measured and quantified according to one investigator's graticule for the neural representation of visual space. Results show a strong correlation between the degree of information loss and the diagnostic value of the visual evoked potential. The technique was, however, capable of detecting abnormality in the absence of recordable field loss when large field and check sizes were used.
J G Flanagan; G F Harding
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Documenta ophthalmologica. Advances in ophthalmology     Volume:  69     ISSN:  0012-4486     ISO Abbreviation:  Doc Ophthalmol     Publication Date:  1988 Jul 
Date Detail:
Created Date:  1988-11-15     Completed Date:  1988-11-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370667     Medline TA:  Doc Ophthalmol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  271-81     Citation Subset:  IM    
School of Optometry, University of Waterloo, Ontario, Canada.
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MeSH Terms
Adenoma / complications*,  physiopathology
Evoked Potentials, Visual*
Nerve Compression Syndromes / etiology,  physiopathology*
Optic Chiasm*
Photic Stimulation
Pituitary Neoplasms / complications*,  physiopathology
Reaction Time
Scalp / physiopathology
Visual Fields

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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