A study of specific quality of labyrinthne ataxia
Project/Area Number |
06671744
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
Otorhinolaryngology
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Research Institution | Kurume University, Faculty of Medicine |
Principal Investigator |
ITO Shinsuke Kurume University, Faculty of Medicine Department of Otolaryngology, Associate Professor, 医学部, 助教授 (30144356)
|
Project Period (FY) |
1994 – 1995
|
Project Status |
Completed (Fiscal Year 1995)
|
Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
|
Keywords | semicircular canal / cristospinal reflex / caloric stimulation / Labyrinthine disorder / vestibulospinal reflex / 半規管 |
Research Abstract |
1, Twenty-one normal adults were the subjects of this study. They were instructed to step in the same position with eyes closed for a total of 50 steps under two condtions : i) Immediately after simultaneous irrigation of the right and left auditory canals for 10s with 30゚C water and 44 ゚C water, respectively, and ii) following irrigation of the right auditory canal with 30゚C water. The two conditions simulates two different types of imbalance of labyrinthine function : The former physiological and the latter non-physiological. Under the first condition, 33% of the subjects tended to fall to the right side during stepping. Under the second condition, 86% showed ataxia. The diference was statistically highly significant, p<0.01. The results indicate that physiolosical imbalance does not always cause ataxia. A physiological imbalance occurs during active turning. The motion brings about an ampullopetal lymphatic flow in the ipsi-lateral horizontal semicircular canal and an ampullofugal lymphatic flow in the ocntralateral canal, as under the second condition. The former increases the function of the labyrinth, while the latter decreases it. 2, A sensitive method of demonstrating latent imbalance of labyrinthine function was devised. The subject was asked to walk at usual speed with eyes coled in a circle 2m in diameter. This test was done by 22 patients whose vestibular function as tested ordinary methods had become normal after an attack of vertigo due to unilateral vestibular disorder. Eighteen patients complained of difficulty in walking while turning to the affected side. Turning in the opposite direction, however, was perfomed without any difficulty. It was thought that the disorders of the cristo-spinal reflex became manifest during circular walking.
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Report
(3 results)
Research Products
(1 results)