平衡神経機能検査における微弱回転刺激の特性に関する研究
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The characteristics of the per- and post-rotatory nystagmus were examined in 140 normal cases. The nystagmus frequency histograms in each 5 seconds were adopted as the observation parameter. The subject were rotated with the constant velocity of 60°/sec2 for 60 seconds Three Kinds of the angular acceleration were used to get the constant velocity, that is, 4°, 3° and 2°/sec2 respectively. The relationship between the nystagmus frequencies and the angular accelerations was examined. Any difference could not be observed among the three kinds of the angular acceleration. The maximum frequency of the post-rotatory nystagmus was higher than that of the perrotatory one. Thus, it was considered that the interruption was more stimulative to the labyrinth than the angular acceleration. This test seems to be possible to reveal vestibular recruitment phenomena, if exist, when it is applied to pathological cases. The relationship between the angular acceleration velocity and the distributions of the nystagmus of the nystagmus frequencies was examined, using the angular acceleration of 2°/sect. And the following conclusions were obtained: 1) The nystagmus frequencies became maximum after cease of acceleration up to the angular velocity of 10° to 30°/sec. 2) However, during 40° to 50°/sec, the frequencies became maximum just when the angular stimulations were finished. 3) On the other hand, the maximum frequencies of the nystagmus preceded the termination of the stimulation during 60° to 90°/sec. After that the nystagmus frequencies were almost constant during accelated stimulations. It means that the vestibular reactions were saturated. And as soon as the acceleration was ceased, the nystagmus frequencies were decreased. The maximum frequencies of the post-rotatory nystagmus were increased in almost parallel with increased in almost parallel with the terminal angular velocity. However, the frequencies were decreased after the maximum frequency was obtained. The following merits of this test were certified with repeated rotatory stimulations, that the distributions of the nystagmus frequency had constancy, and that there was little trend of the response decline.
- 社団法人 日本耳鼻咽喉科学会の論文
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- 第33回 日本平衡神経科学会秋季学会
- 平衡機能検査における微弱回転刺激の特性に関する研究(異常編)
- 平衡神経機能検査における微弱回転刺激の特性に関する研究