無難聴性耳鳴(ストレプトマイシンによる)の研究
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概要
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Tinnitus aurium was classified after Nagahama into the three following types, based upon the results of hearing test:1) Tinnitus aurium without deafness2) Conductive tinnitus3) Perceptive tinnitusAs the non-deaf cases the author had selected the cases which did not reveal hearing loss over 10db in sound of each frequency. Twenty-three cases (43 ears) of tinnitus of this type, due to streptmycin, were collected and an audiometrical study on these cases was carried out.The results are as follows:1) The sound of non-deaf tinnitus is mostly high.2) The tinnitus audiograms which were consisted of the masking curve of tinnitus and the minimal threshold of hearing demonstrated the high sound convergent type in 42.8%.3) From, the difference limen test of these cases the author could evaluate their results as positive(+) or positive-negative(±). So far, the author had emphasized that in these cases disturbance of hearing might exist in the labyrinth in the latent state.4) The minimal threshold of hearing in 80% of these cases has not changed at any frequency in the observation period, of 2 to 17 month.5) From these results the author had expressed his opinion about the origin of tinnitus of this type that some stimuli might be occured in the labyrinth, which do not result in degeneration of the auditory cells, but make continuous mechanical irritation, such as dilatation of the blood vessels or hypertention of the labyrinth liquor.
- 社団法人 日本耳鼻咽喉科学会の論文