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Effect of Tympanic Membrane Perforation on Hearing Threshold Hiroaki Funai 1 1Department of Otolaryngology, Branch Hospital, University of Tokyo pp.125-132
Published Date 1982/2/20
DOI https://doi.org/10.11477/mf.1492209399
  • Abstract
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 Three patients with traumatic perforation at the anterior part of the tympanic membrane were studied throughout medical treatment in order to estimate the effect of perforation on hearing loss.

 The following points were investigated in each patient; 1) Otoscopic observation of the tympanic membrane, 2) audiogram, 3) frequency chracteristic in the external auditory meatus. The effect of "patch" and the pressure and the phase of sound at the auditory canal and the tympanic cavity were also studied in one patient.

 The results were as follows; 1) The hearing loss at mid- and high-frequency tones depends directly on the size of perforation. 2) Low frequency loss is caused by direct admittance of sound pressure to the middle-ear cavity through a perforation.


Copyright © 1982, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 印刷版ISSN 0386-9679 医学書院

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