誘発反応聴力測定における判定に関する研究 : 第2報 人工誘発反応波形による検討

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概要

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• This study was carried out to examine how the evoked response was modified by the spontaneous brain activity. Twenty samples of the averaged spontaneous brain activities were made of a deeply sleeping child of 1 year 8 months old and an awakening adult of 21 years old. Using the complex waveform synthesixer (Exact Model 201), the artificially evoked responses (Ar. E. R. s) were made, which were corresponding to the evoked responses of the deeply sleeping child and the awakening adult.Ten graded different amplitudes of Ar. E. R. s were prepared for the child and for the adult.Each of the Ar. E. R. s were conposed of averaged spontaneous brain activities. Two well trained examiners independently determined the presence of the Ar. E. R. s in 200 composed samples and 20 averaged spontaneous brain activities. 1. It was less significant in the deeply sleeping child than in the awakening adult that the positive determination rate increased with an increase in the amplitude of the Ar. E. R. s. 2. False positive determination occurred 12.5 per cent only in the deeply sleeping child. 3. In case of the deeply sleeping child, the positive determinations were given when the P2-N2 amplitudes of the composed samples were between 19.2-38.5μV. The corresponding P2-N2 amplitudes of the Ar. E. R. s were between 12-60μV. There was no significant correlation between the P2-N2 amplitude of the composed samples and the corresponding Ar. E. R.s. 4. When the positive determination rate attained 100per cent for the first time, the percentage of the amplitude of each composed sample as compared with that of the corresponding At. E. R.ranged from 85.7 to 131.4 in case of the awakening adult. It ranged from 36. 3 to 188. 0 in case of the deeply sleeping child. 5. The range of the latencies in the composed samples was similar to that in ordinary averaged evoked responses (A. E. R.). It was difficult to determine the presence or absence of the evoked responses in ordinary A. E. R. of a deeply sleeping child. The determination even by well trained examiners was not always reliable and the averaged evoked response was not consistent due mainly to the modification by the spontaneous brain activity.

• 社団法人 日本耳鼻咽喉科学会の論文

著者

• 山本 香列

  信州大学医学部耳鼻咽喉科学教室

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