防音圧チャンバーによる耳管の換気能検査:臨床例の検討

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Using a newly designed sound-proof pressure chamber, we tested Eustachian tube function in seven patients with suspected tubal dysfunction. Patients lay in a supine position in the pressure chamber. Bekesy air conduction audiometry was performed at 1,000 Hz under the following pressure conditions: 1)200 mmH2O below atmospheric pressure,2) 200 mmH2O above atmospheric pressure,3)700 mmH2O below atmospheric pressure, and 4) 700 mmH2O above atmospheric pressure. The rate of pressure change was a constant 33 mmH2O/sec for all four conditions. In conditions 1) and 2), the patient was instructed not to swallow until the pressure change was complete; when the target pressure had been reached, the patient was asked to swallow once every 15 seconds. We then counted the number of swallows required for the patient's hearing to return to the baseline level. In conditions 3) and 4), the patient was told to swallow as frequently as possible both before and after completion of the pressure change; measurements were made of the maximum hearing level and of the time needed before the patient's hearing returned to its original level. Although six of the seven patients showed normal results in catheter insufflation tests performed during their previous visit and tympanograms taken just prior to our pressure test, longer than normal times were required to recover their hearing. Interestingly, one of these six reported a disappearance of ear stuffiness following the test. We concluded that this pressure test is useful not only for the diagnosis of Eustachian tube function but also as a possible therapy for aiding adaptation to changing environmental pressure.
耳鼻咽喉科臨床学会の論文

防音圧チャンバーによる耳管の換気能検査:臨床例の検討

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