聴覚疲労の臨床的観察
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概要
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Auditory fatigue in supra-threshold tone was examined by Feldmann's method in 200 ears with normal hearing or perceptive deafness. Sound stimulation was performed with 1000 and 4000cps tone, intensity being 80 db SL. 0-15db of sensation decay at the stimulation sound was observed at the end of 3 min. stimulatory duration, with the exception of marked fatigue up to 20db or more shown by several cases of perceptive deafness. In normal ears, this sensation decay disappeared in 1min. after the cessation of stimulation, but of patients with perceptive deafness or vascular disturbances ca. 30% showed prolonged recovery time.To study the effect of hypertonic sodium-bicarbonate solution on auditory fatigue, the abovementioned examination was done before and after the intravenous injection of 7% sodium-bicarbonate solution. Results indicated that after the injection, fatigue was remarkably decreased or even disappeared and prolonged recovery time returned to normal.The effect of this treatment on temporary threshold shift after a relatively strong stimnlation was also studied in 61 ears with normal hearing or peceptive deafness. Ears were stimulated for 3 minutes with 3000 cps tone with intensity of 80 or 90db, and the recovery curve of threshold at 4000cps was observed. The recovery process in normal ears which had been slightly prolonged previously was accerelated by the treatment, whereas no effect was observed on normal orr remaskably prolonged recovery process in ears with perceptive deafness which often showed disturbed recovery curve.
- 一般社団法人 日本耳鼻咽喉科学会の論文