騒音難聴の臨床的研究 : 第3報側頭骨含気蜂窩発育の影響

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The relationship between the pneumatization of the temporal bone and progress of noiseinduced deafness was studied in 328 patients with noise-induced deafness.The results obtained were as follows:1) The size of pneumatization as measured by the rectangular method on the X-ray films averaged 19.6cm2.2) The difference in hearing between right and left ear was examined in each frequency and in average hearing threshold level. There was a similar tendency through frequencies tested.3) The difference in the size of pneumatization between right and left ear was compared with that in the hearing loss, and it revealed that the difference in the development of pneumatization between the right and left was clearly conspicuous.4) The correlation between the area of the development of pneumatization and the average hearing threshold was examined statistically in all ears. No correlation was observed between the two.5) The development of the pneumatization was divided into three groups, i. e., large, medium and small. The average hearing threshold level measured by the hexagonal method in these groups and the significant difference between the groups were found. As a result, a significant difference was noted between the large group and small group or between the medium group and small group.6) The results obtained under5) were examined as to each frequency. All frequencies showed results almost similar to those with the average hearing threshold level measured by the hexagonal method. But results at 4kHz were not particularly different from those at other frequencies.The results above suggested that the development of pneumatization of the temporal bone would exert somewhat inhibitory action on the advance of noiseinduced deafness.
社団法人日本耳鼻咽喉科学会の論文

騒音難聴の臨床的研究 : 第3報側頭骨含気蜂窩発育の影響

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騒音難聴の臨床的研究 : 第3報 側頭骨含気蜂窩発育の影響

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騒音難聴の臨床的研究 : 第3報側頭骨含気蜂窩発育の影響