Sonotubometric Assessment for Severity of Patulous Eustachian Tube

Objective: To investigate the relationship between the morphological patency of the eustachian tube (ET) and sound transmission via the ET. Study Design: Retrospective chart review and model experiment. Setting: Tertiary referral center. Subjects: A total of 56 ears of 28 patients (9 men and 19 women, aged from 12 to 82 yr, mean 40.4 ± 21.5 yr) who underwent sonotubometric measurement using postural change as well as computed tomography (CT) of the ET in the sitting position, including 26 ears with definite patulous ET, 9 ears with possible patulous ET, and 21 ears without patulous ET. Method: Commercial equipment for sonotubometry (JK-05A; RION Co., Ltd., Kokubunji, Tokyo, Japan) was used in the following two investigations. Retrospective survey: sound patency of 7 kHz band noi...

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