直線運動刺戟に対する前庭器の感覚閾値についての研究

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概要

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• A stimulating apparatus to give straight movement toward a single direction was devised to test vestibular function, especially function of the ossicles. The lowest threshold of motion sense for straight vertical, lateral and anterior and posterior movement was measured in supine, prone, right and left lateral positions.In normal adults the lowest threshold in recognizing movement to each direction was between 4cm/sec2 and 18cm/sec2. Only 2.86 per cent of tested subjects recognized the accelerating motin in 4cm/sec2, and all (100 per cent) recognized this motion in 18cm/sec2. In regard to the positional difference in motion sense threshold, the sitting position was found to be most sensitive. Among other positions, prone position was most sensitive to vertical and lateral movement, and lateral position to anterior and posterior movement, when the motion stimulus was below 7cm/sec2. If the stimulus was over 7cm/sec2, no statistically significant difference was found among various positions.Influence of uni-or bilateral sound stimulus to motion sense threshold was next studied, revealing elevated threshold of motion sense under loud sound stimulus.This testing method was applied to a case of unilateral labyrinthine disorder (auditory and vestibular dysfunction) and a case of bilateral deafness. As the result elevated threshold or loss of motion sense was found in those who disclosed vestibular dysfunction under ordinary methods.It was learned by this study that the labyrinth is sensitive to straight motion stimulus and the examination using the swing apparatus is a convenient and clinically useful method to test vestibular function, especially of the ossicles.

• 社団法人 日本耳鼻咽喉科学会の論文

著者

• 向笠 朝彦

  長崎大学医学部耳鼻咽喉科学教室

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• 直線運動刺戟に対する前庭器の感覚閾値についての研究

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