Publication: Tympanic membrane perforation descriptors and hearing levels in otitis media
1
Issued Date
1982-01-01
Resource Type
ISSN
14992027
Other identifier(s)
2-s2.0-0020061144
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
International Journal of Audiology. Vol.21, No.1 (1982), 43-51
Suggested Citation
Suchitra Prasansuk, R. Hinchcliffe Tympanic membrane perforation descriptors and hearing levels in otitis media. International Journal of Audiology. Vol.21, No.1 (1982), 43-51. doi:10.3109/00206098209072727 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/30318
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
Tympanic membrane perforation descriptors and hearing levels in otitis media
Author(s)
Other Contributor(s)
Abstract
The air conduction threshold of hearing was determined at 0.5, 1 and 2 kHz by manual audiometry on a consecutive series of young Thai adults with bilateral chronic suppurative otitis media. At the same time, after visual inspection of each tympanic membrane, the perforation was drawn, as faithfully as possible in respect of both shape and relative size, on a 40-mm diagram of a tympanic membrane. A study of the shapes of perforations showed that they could be described as elliptical, reniform or cardioid. For the purposes of calculating the area of a perforation, a reniform perforation was considered to be the result of substracting a smaller ellipse from a larger ellipse, which ellipses were in contact at the point of least curvature. The hearing threshold level was found to be a function of the size of the perforation. A power function best described this relationship. The relationship was such that a total perforation would be associated with a hearing loss of about 60 dB HL over the frequency range 0.5-2 kHz. © 1982 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.