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The Subjective Horizontal in Eccentric Rotation Influenced by Peripheral Vestibular Lesion
- Source :
- Acta Oto-Laryngologica. 116:181-184
- Publication Year :
- 1996
- Publisher :
- Informa UK Limited, 1996.
-
Abstract
- Peripheral vestibular equilibrium disorders may originate in various parts of the labyrinth or the vestibular nerve. Traditionally, the function of the lateral semicircular canals has been assessed with caloric irrigation, and sometimes falsely been interpreted as a vestibular nerve lesion. The vertical semicircular canals are not easily assessed. Caloric testing with the head in different positions is not very helpful, but the canals may pairwise be tested using specific rotational techniques. Often the otolithic organs, capable of detecting linear acceleration forces, are forgotten as a source of vertigo and dizziness. We have implemented horizontal rotatory testing with the subject seated eccentrically facing the direction of rotation as a means of assessing otolithic function. The subject experiences a lateral tilt and is instructed in darkness to put a short light bar in the position he thinks a water surface would have, which is identical to his perceived tilt. In 39 normal subjects, a theoretical tilt of 24 degrees was estimated as approximately 19.5 degrees, and the standard deviation was 6 degrees. A side difference index was proposed to be normal if below 25%. The preliminary findings in a few patients with known labyrinthine lesions are presented. We propose that otolithic as well as lateral semicircular canal functions are useful to monitor in patients with suspected peripheral equilibrium disorders.
- Subjects :
- Adult
Male
Rotation
Posture
Otolithic Membrane
Vertigo
Caloric Tests
otorhinolaryngologic diseases
Humans
Medicine
Eccentric
Peripheral Nerves
Postural Balance
Vestibular system
biology
business.industry
Infant
Caloric theory
General Medicine
Anatomy
Middle Aged
Vestibular nerve
biology.organism_classification
Vestibular Diseases
Otorhinolaryngology
sense organs
Righting reflex
business
Head
Tilt (camera)
Subjects
Details
- ISSN :
- 16512251 and 00016489
- Volume :
- 116
- Database :
- OpenAIRE
- Journal :
- Acta Oto-Laryngologica
- Accession number :
- edsair.doi.dedup.....df8c223533f145b6f975328d156d5c98