耳鳴の大きさならびにその評価法に関する臨床的研究
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概要
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It is very important to evaluate the loudness of tinnitus adequately for the appropriate treat ment.The loudness balance test and masking test are commonly used for the evaluation of tinnitus loudness. In this report, the subjective loudness level of tinnitus was compared with the loudness level of tinnitus measured by the above two tests and also with the pure tone threshold in 211 patients with tinnitus.The subjective loudness of tinnitus in these cases was classified into five degrees (very soft (0) to very loud(4)). Thus the subjective loudness level measured by these two tests was expressed by two levels which were the audiometer level and the sensation level.The following results were obtained:1) The tinnitus loudness expressed by the sensation level in these two tests is not useful when the tinnitus loudness is compared in the individual cases. Because the loudness of tinnitus is often estimated much smaller by the influence of recruitment and the technical error of these tests in the 5 dB step measurement method is large.2) The tinnitus loudness expressed by the audiometer level changed almost in parallel with the pure tone threshold. Therefore, it is speculated that the tinnitus loudness, expressed by the audiometer level can not be the true tinnitus loudness level.3) The subjective loudness of the tinnitus seems to be increased with the deterioration of the pure tone threshold.4) From these results, both the loudness balance and masking tests are thought to be unsuitable for evaluating the tinnitus loudness. A more appropriated method should be made to evaluate tinnitus loudess adequately.
- 一般社団法人 日本耳鼻咽喉科学会の論文