| Home | E-Submission | Sitemap | Editorial Office |  
top_img
Research in Vestibular Science > Volume 8(0); 2009 > Article
Research in Vestibular Science 2009;8(0): 22-30.
반고리관 기능의 이학적 검사
채성원
고려대학교 의과대학 이비인후과학교실
Laboratory Tests for Semicircular Canal Function
Sung Won Chae, MD
Department of Otorhinolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea
ABSTRACT
The semicircular canals sense angular acceleration and are arranged in roughly parallel pairs. The vestibuloocular reflex (VOR) is responsible for maintaining binocular fixation and stabilizing binocular foveal images during head movements. The VORs are divided into two types: angular and linear. Angular reflexes are initiated by activation of the semicircular canals. There are several kinds of test for semicircular canal function such as caloric test, rotation test, and pulse step sine test. Caloric testing remains the most useful laboratory test in determining the responsiveness of a labyrinth. It is one of the few tests that allow one labyrinth to be studied independently of the other. The stimulus can be applied relatively easily with techniques that are commonly available. Caloric testing relies on stimulating or cooling the vestibular system by alternately heating and cooling the external auditory canal with water or air. Rotational tests analyze the responses of both labyrinths together. They require a high-torque motor-driven chair and relatively advanced software to analyze the results. Rotatory chair testing is useful in assessing vestibular function in patients with suspected bilateral vestibular hypofunction and children. Step changes in head velocity can be used instead of sinusoidal rotations to identify vestibular hypofunction. Time constant are determined by the time after onset of the stimulus at which slow phase eye velocity has decreased by 67% of its initial value. The use of a novel “pulse-step-sine” (PSS) rotational stimulus can identify abnormal function of the horizontal semicircular canals in human subjects with unilateral and bilateral vestibular deficits. Research in Vestibular Science 2009;8(2 suppl 1):S22-S30
TOOLS
PDF Links  PDF Links
Full text via DOI  Full text via DOI
Download Citation  Download Citation
CrossRef TDM  CrossRef TDM
  E-Mail
Share:      
METRICS
694
View
23
Download
Related articles
Diagnosis of the vertical semicircular canal type BPPV  2002 June;1(1)
Impulsive Testing of Semicircular Canal Function  2007 June;6(1)
Laboratory Tests for Otolith Function  2009 December;8(0)
Editorial Office
Department of Neurology, Chonnam National University Hospital
42 Jeong-ro, Dong-gu, Gwangju 61469, Korea
Tel: +82-62-220-6274   Fax: +82-62-228-3461   E-mail: nrshlee@chonnam.ac.kr
About |  Browse Articles |  Current Issue |  For Authors and Reviewers
Copyright © The Korean Balance Society. All rights reserved.                 Developed in M2Community