大気圧変化による聴覚障害の機序

概要

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The mechanism of deterioration in bone conduction due to changes in atmospheric pressure was examined in 20 normal subjects using a sound-proof pressure chamber. The subjects wore special ear plugs with which the external auditory canal was connected to a pressure gauge and and a small pump placed outside the chamber. Subjects were in structed not to swallow to avoid active opening of the Eustachian tube. The chamber pressure was decreased (or increased) to± 500 mmH2O at a speed of 30 mmH2O/sec. Then pressure in the external auditory canal was decreased (or increased) gradually after the chamber pressure had reached ±500 mmH2O. However, the level of bone conduction did not recover the level before decrease (or increase) in the chamber pressure. These findings suggest that at a least minor part of the deterioration in bone conduction after changes in the chamber pressure was caused by displacement of the round window membrane.
耳鼻咽喉科臨床学会の論文