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Reduction of the time constant in the VOR as a protective mechanism in acute vestibular lesions

Magnusson, M LU ; Brantberg, K; Pyykkö, I. and Schalén, L LU (1989) In Acta Oto-Laryngologica, Supplement 468. p.32-329
Abstract

Fourteen patients with vestibular neuritis were examined at onset of symptoms and after one year. Postrotatory time constant and gain in the vestibulo-ocular reflex (VOR) were measured after rotation with a velocity step of 150 deg/s. There was no significant difference in gain towards the healthy side at onset of the disease compared to recordings after one year. The time constant towards the healthy side was significantly shorter at onset compared to measurements after one year. The results reflect the loss of unilateral vestibular function on the velocity storage mechanism, both in the acute situation and after compensation. The findings indicate that reduction of the time constant in the VOR is not only due to unilaterally... (More)

Fourteen patients with vestibular neuritis were examined at onset of symptoms and after one year. Postrotatory time constant and gain in the vestibulo-ocular reflex (VOR) were measured after rotation with a velocity step of 150 deg/s. There was no significant difference in gain towards the healthy side at onset of the disease compared to recordings after one year. The time constant towards the healthy side was significantly shorter at onset compared to measurements after one year. The results reflect the loss of unilateral vestibular function on the velocity storage mechanism, both in the acute situation and after compensation. The findings indicate that reduction of the time constant in the VOR is not only due to unilaterally vestibular impairment but it is also an effect of the generally reduced activity in the vestibular system after a lesion and may act as protective mechanism in acute vertigo.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Acute Disease, Humans, Neuritis, Reflex, Vestibulo-Ocular, Rotation, Time Factors, Vestibular Function Tests, Vestibular Nerve, Journal Article
in
Acta Oto-Laryngologica, Supplement
volume
468
pages
4 pages
publisher
Scandinavian University Press
external identifiers
  • scopus:0024848935
ISSN
0365-5237
language
English
LU publication?
yes
id
8535f36d-b9d6-4e0d-a3b0-be2631700b83
date added to LUP
2017-05-03 12:55:53
date last changed
2017-05-15 15:32:04
@article{8535f36d-b9d6-4e0d-a3b0-be2631700b83,
  abstract     = {<p>Fourteen patients with vestibular neuritis were examined at onset of symptoms and after one year. Postrotatory time constant and gain in the vestibulo-ocular reflex (VOR) were measured after rotation with a velocity step of 150 deg/s. There was no significant difference in gain towards the healthy side at onset of the disease compared to recordings after one year. The time constant towards the healthy side was significantly shorter at onset compared to measurements after one year. The results reflect the loss of unilateral vestibular function on the velocity storage mechanism, both in the acute situation and after compensation. The findings indicate that reduction of the time constant in the VOR is not only due to unilaterally vestibular impairment but it is also an effect of the generally reduced activity in the vestibular system after a lesion and may act as protective mechanism in acute vertigo.</p>},
  author       = {Magnusson, M and Brantberg, K and Pyykkö, I. and Schalén, L},
  issn         = {0365-5237},
  keyword      = {Acute Disease,Humans,Neuritis,Reflex, Vestibulo-Ocular,Rotation,Time Factors,Vestibular Function Tests,Vestibular Nerve,Journal Article},
  language     = {eng},
  pages        = {32--329},
  publisher    = {Scandinavian University Press},
  series       = {Acta Oto-Laryngologica, Supplement},
  title        = {Reduction of the time constant in the VOR as a protective mechanism in acute vestibular lesions},
  volume       = {468},
  year         = {1989},
}