圧負荷音響耳管検査法

概要

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Adapting the conventional sonotubometric method, we developed a device to detect tubal dysfunction by applying pressure to the middle ear through a perforated ear drum. The pressure applied to the middle ear caused deformation of the tubal lumen, which was shown as a change of the sound pressure level in the middle ear.Using this device, we examined 8 traumatically perforated ears with normal tubes. There was no change in the sound pressure level in the middle ear under positive or negative pressure, and the sound pressure level increased only when the tube was open. The normal tube has a tight structure against pressure form the middle ear.On the other hand, in patients with abnormal tubes the sound pressure level changed soon after pressure was applied to the middle ear. Positive pressure induced an increase in the sound pressure level and negative pressure, a decrease to the lowest level, due to the change of the compliant tubal lumen.This device can detect abnormal tubes such as floppy tubes or tubes with inability to close.
耳鼻咽喉科臨床学会の論文