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Asymmetric optokinetic afterresponse in patients with small acoustic neurinomas

Brantberg, K and Magnusson, M LU (1990) In Journal of Vestibular Research: Equilibrium and Orientation 1(3). p.299-307
Abstract

Directional asymmetry of primary and secondary optokinetic afternystagmus (OKAN I and OKAN II, respectively) was studied in 20 patients with small acoustic neurinomas (< or = 20 mm), and results were compared to those for 24 normal controls. The optokinetic afterresponse was induced by 60 s of horizontal whole-field optokinetic stimulation in both directions. Among patients, the optokinetic afterresponse was asymmetric, OKAN I and OKAN II beating toward the lesioned ear being significantly weaker than the OKAN I and OKAN II beating toward the healthy ear. Hence, in these patients with gradual deterioration of vestibular function, the vestibular side-difference was reflected both in OKAN I and OKAN II. Although asymmetry in OKAN I was... (More)

Directional asymmetry of primary and secondary optokinetic afternystagmus (OKAN I and OKAN II, respectively) was studied in 20 patients with small acoustic neurinomas (< or = 20 mm), and results were compared to those for 24 normal controls. The optokinetic afterresponse was induced by 60 s of horizontal whole-field optokinetic stimulation in both directions. Among patients, the optokinetic afterresponse was asymmetric, OKAN I and OKAN II beating toward the lesioned ear being significantly weaker than the OKAN I and OKAN II beating toward the healthy ear. Hence, in these patients with gradual deterioration of vestibular function, the vestibular side-difference was reflected both in OKAN I and OKAN II. Although asymmetry in OKAN I was frequently observed among controls, it was significantly more pronounced among the patients. Moreover, patients could be distinguished by the occurrence of OKAN II, as it did not occur at all among controls exposed to the same stimulation.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Adult, Aged, Caloric Tests, Female, Humans, Male, Middle Aged, Neuroma, Acoustic, Nystagmus, Optokinetic, Vestibule, Labyrinth, Journal Article, Research Support, Non-U.S. Gov't
in
Journal of Vestibular Research: Equilibrium and Orientation
volume
1
issue
3
pages
9 pages
publisher
IOS Press
external identifiers
  • scopus:0025574319
ISSN
0957-4271
language
English
LU publication?
yes
id
3cce7ca7-fa64-4cdb-9093-551319582f18
date added to LUP
2017-05-03 12:51:07
date last changed
2017-05-07 04:53:04
@article{3cce7ca7-fa64-4cdb-9093-551319582f18,
  abstract     = {<p>Directional asymmetry of primary and secondary optokinetic afternystagmus (OKAN I and OKAN II, respectively) was studied in 20 patients with small acoustic neurinomas (&lt; or = 20 mm), and results were compared to those for 24 normal controls. The optokinetic afterresponse was induced by 60 s of horizontal whole-field optokinetic stimulation in both directions. Among patients, the optokinetic afterresponse was asymmetric, OKAN I and OKAN II beating toward the lesioned ear being significantly weaker than the OKAN I and OKAN II beating toward the healthy ear. Hence, in these patients with gradual deterioration of vestibular function, the vestibular side-difference was reflected both in OKAN I and OKAN II. Although asymmetry in OKAN I was frequently observed among controls, it was significantly more pronounced among the patients. Moreover, patients could be distinguished by the occurrence of OKAN II, as it did not occur at all among controls exposed to the same stimulation.</p>},
  author       = {Brantberg, K and Magnusson, M},
  issn         = {0957-4271},
  keyword      = {Adult,Aged,Caloric Tests,Female,Humans,Male,Middle Aged,Neuroma, Acoustic,Nystagmus, Optokinetic,Vestibule, Labyrinth,Journal Article,Research Support, Non-U.S. Gov't},
  language     = {eng},
  month        = {01},
  number       = {3},
  pages        = {299--307},
  publisher    = {IOS Press},
  series       = {Journal of Vestibular Research: Equilibrium and Orientation},
  title        = {Asymmetric optokinetic afterresponse in patients with small acoustic neurinomas},
  volume       = {1},
  year         = {1990},
}