Measurements of Dynamic Eustachian Tube Function by Impedance Meter

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  • インピーダンスメーターによる動的耳管機能測定の試み
  • インピーダンス メーター ニヨル ドウテキ ジカン キノウ ソクテイ ノ ココ

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Abstract

We report herein two impedance methods for evaluating Eustachian tube function. The principle of these methods consists of recording of impedance in the ear drum during Valsalva's maneuver and swallowings, either with or without nasopharyngeal pressure. The first method involves a simultaneous recording of impedance of the ear drum with nasopharyngeal pressure. For this purpose a pressure transducer attached to the impedance meter (Madsen ZO 72) was utilized after making minor changes in the meter. The second method was a recording of the compliance in the ear drum. The advantage of the latter method is that there is no need for additional apparatus, the X-Y recorder of the impedance meter is sufficient. By these acoustic methods, inflow and outflow of air through the Eustachian tube was recorded as patterns of impedance change. They were classified into three groups; normal, occluded and patent patterns, and a close correlation between clinical findings and recorded pattern was confirmed. These impedance tests have proven to be simple and reliable for clinical use.

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