中耳根治手術と聴力に関する研究
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Statistical observation was made in 112 cases of radical mastoid operations.The air and bone conduction audiometry was done before and after the operation, and the results obtained were as follows: A)In the ear performed by the radical mastoid operation. 1)No significant change of the mean value of bone conduction hearing loss was ob- served in each frequency examined. 2)In speech range, when the hearing of patients before the operation was between 0 and 50db, the hearing decreased by the operation.When the hearing was less than 50db, it was improved by the operation.But the change of hearing after the operation was less than ±30db. 3)The mean values of air and bone conduction were as follows;(Significance level, 5%) i)Air conduction 125cps.39.2±αdb. 250 cps.49.6±2.7db. 500 cps.52.0±2.9db. 1, 000 cps.50.3±2.8db. 2, 000 cps.47.2±3.1db. 4, 000 cps.51.4±αdb. 8, 000 cps.45.3±αdb. ii)bone conduction 250cps.-3.2±2.7db. 500 cps.-2.1±3.3db. 1, 000 cps.2.4±3.7db. 2, 000 cps.8.8±4.1db. 4, 000 cps.4.8±4.2db. 8, 000 cps.11.1±αdb. B)The mean values of bone conduction in chronic otitis media were as follows;(Sig- nificance level, 5%) 250 cps.-2.4±3.0db. 500 cps.1.2±3.3db. 1, 000 cps.5.4±4.0db. 2, 000 cps.6.8±4.3db. 4, 000 cps.10.9±5.0db. 8, 000 cps.15.2±αdb.
- 社団法人 日本耳鼻咽喉科学会の論文
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