Prosthesis Test for Chronic Otitis Media with Perforation; Evaluation by Speech Hearing Test.

概要

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Pure tone hearing level and speech reception threshold in the presence of a prosthesis were investigated in 80 ears with chronic otitis media with perforation to clarify the usefulness of the assessment of speech hearing in evaluating the prosthesis test. The tests were repeated after tympanoplasty in the same patients.In 38 ears with no abnormalities of the ossicular chain, both the pure tone hearing level and the speech reception threshold were improved by the prosthesis. In 31 ears with fixation of the ossicular chain, the pure tone hearing level at low to middle frequencies was improved by the prosthesis, but the speech reception threshold did not improve. In 11 ears with dislocation of the ossicular chain, both the pure tone hearing level and the speech reception threshold did not improve with the prosthesis.Both the hearing level and the speech reception threshold improved in ears with no abnormalities after tympanoplasty. They also improved after tympanoplasty in ears with dislocation of the ossicular chain. In ears with ossicular fixation, hearing levels at low frequencies improved after the operation, but the speech reception threshold did not improve.These results suggest that the prosthesis test should be performed with the assessment of both the pure tone hearing level and speech hearing.
耳鼻咽喉科臨床学会の論文