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tympanometry in conductive deafness with intact tympanic membrane

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https://www.readbyqxmd.com/read/24427699/a-comparative-study-of-eustachian-tube-functions-in-normal-and-diseased-ears-with-tympanometry-and-videonasopharyngoscopy
#1
Bhushan Chauhan, Komal Chauhan
Eustachian tube is a bony and fibrocartilagenous tube extending from the antero-inferior part of middle ear cleft to lateral wall of the nasopharynx. Its main functions are ventilation of middle ear to equalize the middle ear pressure with atmospheric pressure and mucociliary clearance. The functioning of eustachian tube has a direct impact on normal middle ear function. As a corollary, dysfunction of eustachian tube inevitably leads to retraction of the tympanic membrane initially and sterile effusion and subsequent conductive deafness later...
December 2013: Indian Journal of Otolaryngology and Head and Neck Surgery
https://www.readbyqxmd.com/read/2348276/-diagnosis-of-conductive-deafness-by-static-compliance
#2
K Kumakawa
The diagnosis of the ossicular condition, fixation or interruption, is often not achieved by the tympanometry, because the overlap of the distribution of the static compliance (SC) is so great with the normal group in these two groups. Therefore, it has been said that SC, by itself, has little diagnostic value for differentiating the ossicular lesion. The overlap of the distribution of SC, however, was much smaller between the group with ossicular fixation and the one with ossicular discontinuity. So, apart from deviation from the normal range of SC, the limiting value of SC for discriminating the two groups was determined in ears with conductive hearing loss...
February 1990: Nihon Jibiinkoka Gakkai Kaiho
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