Document Detail

Visual evoked potentials and electroretinography in brain-dead patients.
MedLine Citation:
PMID:  8223114     Owner:  NLM     Status:  MEDLINE    
Visual evoked potentials and electroretinograms were elicited by light-emitting diode stimulation and recorded simultaneously, with cephalic and noncephalic references, in 30 normal subjects and in 30 brain-dead patients. A characteristic pattern was found in the group of patients: when a cephalic reference was used for both visual evoked potentials and the electroretinogram, the a- and b-waves of the electroretinogram were recognized in all patients, and visual evoked responses consisted of waves with inverse polarity, similar morphologic characteristics, the same latency, and less amplitude than those of the electroretinogram. When a noncephalic derivation was chosen for the electroretinogram and visual evoked potentials, electroretinogram did not change in either morphologic features or latency, whereas the visual evoked potential channel showed no response. Only in two cases was it possible to record waves in the visual evoked potential lead with a noncephalic reference, showing a spread of the electroretinogram to the occipital area, with a considerably reduced amplitude. These results suggest that, although contamination of visual evoked potential records by the spread of the electroretinogram to the occipital area could occur, it is easy to confirm the absence of a true cortical visual response in brain-dead patients by means of a noncephalic reference. This pattern clearly confirms that in the visual pathways of brain-dead patients, electrical activity is confined to the retina.
C Machado; R Santiesteban; O García; P Coutin; M A Beurgo; J Román; J Miranda; J Suárez; G Pfurtscheller
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Documenta ophthalmologica. Advances in ophthalmology     Volume:  84     ISSN:  0012-4486     ISO Abbreviation:  Doc Ophthalmol     Publication Date:  1993  
Date Detail:
Created Date:  1993-12-21     Completed Date:  1993-12-21     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0370667     Medline TA:  Doc Ophthalmol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  89-96     Citation Subset:  IM    
Institute of Neurology and Neurosurgery, Department of Clinical Neurophysiology, Havanna, Cuba.
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MeSH Terms
Aged, 80 and over
Brain Death / physiopathology*
Evoked Potentials, Visual*
Middle Aged
Retina / physiopathology*
Visual Pathways / physiology

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