原因不明の一側性感音難聴に関する研究
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概要
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Five hundred and eighty-eight cases of unilateral sensorineural hearing loss of unknown origin were studied, by dividing into "unilateral total deafness" and "unilateral non-total deafness" on the basis of audiogram at the initial examination, and the following results were obtained: 1) "Unilateral sensorineural hearing loss" was observed in about 12.1% of the whole sensorineural deafness, almost half of which had "unilateral total deafness" and the onset was conjectured before 10 years of age. 2) The audiometric pattern of the "unilateral non-total deafness" was high tone deafness and flat form in many cases, and in some cases other patterns is observed. The onset was in the thirties and fourties, and the lesion was of cochlear type in many cases. 3) For the "unilateral total deafness", the hearing on the healthy side was followed up for a long period, but there did not seem to be any deterioration of hearing on the healthy side. 4) The change of hearing on the affected side was observed in 29% of "unilateral non-total deafness" The progress was slow and showed aggravation of 10-30dB, in many cases. Positive recruitment test and no ABR abnormality suggested deafness of cochlear type. 5) In pluridirectional macrotomography of "unilateral non-total deafness", there is a case suspected of cochlear sclerosis on the affected side, suggesting the participation of vascular etiology of hearing impairment. 6) From the fact that a case of "unilateral non-total deafness" was diagnosed as the acoustic tumor 5 years after the initial examination, the necessity of long term observation has been stressed in the "idiopathic unilateral sensorineural hearing loss", especially of retrolabyrinthine type.
- 一般社団法人 日本耳鼻咽喉科学会の論文