Abstract
The authors reported a case of reduced bone conduction threshold in a middle freqency range following chronic adhesive otitis. After preparating the ear drum from the promontorium and removal of the granulation around the ossicles, bone conduction threshold improved about 15db at 3000Hz., 4000Hz, and 5000Hz. From such findings the authors felt that the bone conduction threshold in a middle or high frequency range was not always considered to suggest a degree of impairment of perceptive organ. In this case the granulation around the ossicles and the adhesion of ear drum may be considered as contrib- uting to the mechanism of bone conduction improved about 15db in a middle or high frequency range. llighrly.
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