Hearing loss in perforations of the tympanic membrane

Ahmad, Shakil; Ramani, Gautam

doi:10.1017/s0022215100088162

Cited by 65 publications

(72 citation statements)

References 5 publications

(4 reference statements)

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“…A postero-inferior perforation results in larger hearing loss than an antero-inferior perforation. Ahmad and Ramani [6] had also found similar findings in their study where they found 18.5 dB HL in anterior perforation and 29 dB HL in posterior perforation with 500 Hz. But they concluded: ''It is seen that the difference in hearing losses between antero and postero-inferior perforations, is appreciable only at the lower frequencies''.…”

Section: Discussionsupporting

confidence: 74%

Pre-Operative and Post-Operative Assessment of Hearing following Tympanoplasty

Shetty

2011

Indian J Otolaryngol Head Neck Surg

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Tympanoplasty is one of the ever evolving surgical procedures mainly aimed at restoring the hearing loss and eradication of middle ear disease. We have made an attempt to assess the hearing improvement of various types and techniques of tympanoplasty. A prospective observational study was done on 50 cases of CSOM, of which 45 cases were tubotympanic type, and 5 cases were attico-antral. Patients of only pure conductive component with good cochlear reserve and good Eustachian tube function were considered for the study. This study aims at assessing the hearing improvement with various types of tympanoplasty.

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Section: Discussionsupporting

confidence: 74%

Pre-Operative and Post-Operative Assessment of Hearing following Tympanoplasty

Shetty

2011

Indian J Otolaryngol Head Neck Surg

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“…Posteroinferior perforations abolish the sound protection of the round window and hence, they will cause more hearing loss than perforations in other quadrant. 9 To sum up, because of the high incidence of conductive hearing loss caused by central perforations of tympanic membrane, the conflicting reports regarding the effect of perforations on hearing loss, this project has been under taken to study the effects of site and size of tympanic membrane perforation on degree of hearing loss.…”

Section: Introductionmentioning

confidence: 99%

Tympanic membrane perforation: correlation of hearing loss with its site and size

Pal

Kumar

2018

Int J Otorhinolaryngol Head Neck Surg

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Background: The objectives of the study were correlation of hearing loss with size and site of tympanic membrane perforation. Methods: A cross-sectional prospective study of 100 patients of both sex and age between 11-60 years with perforated tympanic membrane was conducted in the department of Otorhinolaryngology (ENT). Size and site of TM perforation was assessed using otoscope and otomicroscope. Size of perforation was measured with 1 mm thin wire loop and vernier caliper. Patients were divided into three groups according to size; Group I (0-9 mm), Group II (9-30 mm), Group III (>30 mm). The tympanic membrane was divided into five segments anterosuperior, posterosuperior, anteroinferior, posteroinferior and central for the localization of the site of perforation. Data thus collected was statistically analysed. Results: Patients with Group I perforation had an average hearing loss of 31.42±7.15 decibel. Group II had an average hearing loss of 39.42±8.97 decibel. Group III had an average hearing loss of 48.91±7.38 decibel. Maximum hearing loss was noted in patients with central perforation with an average hearing loss of 39.34±9.47 decibel. Average hearing loss was found higher in posterior perforations than anterior quadrant perforations. This difference was however not statistically significant with ‘p’ value of ‘0.689’. Conclusions: Linear correlation was found between size of tympanic membrane perforation and degree of hearing loss. No linear correlation between site of tympanic membrane perforation and hearing loss was found. We found no correlation between duration of disease and size of tympanic membrane perforation with degree of hearing loss.

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“…The reduction in energy transfer efficiency caused by TM perforation has been measured in human temporal bones and simulated in a simple circuit model by Voss et al ͑2001a;2001b;2001c; with a series of publications. It has been tested in animals ͑Bigelow et al, 1996;Santa Maria et al, 2007͒ andclinical studies ͑Ahmad andRamani, 1979;Mehta et al, 2006͒. However, the circuit model does not have structural geometry, and the parameters of the model are determined by fitting model results with experimental a͒ Author to whom correspondence should be addressed. Electronic mail: rgan@ou.edu b͒ Present address: Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA 02114. measurements in each individual temporal bone.…”

Section: Introductionmentioning

confidence: 99%

Finite element modeling of sound transmission with perforations of tympanic membrane

Gan

Cheng

Dai

et al. 2009

The Journal of the Acoustical Society of America

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A three-dimensional finite element ͑FE͒ model of human ear with structures of the external ear canal, middle ear, and cochlea has been developed recently. In this paper, the FE model was used to predict the effect of tympanic membrane ͑TM͒ perforations on sound transmission through the middle ear. Two perforations were made in the posterior-inferior quadrant and inferior site of the TM in the model with areas of 1.33 and 0.82 mm 2 , respectively. These perforations were also created in human temporal bones with the same size and location. The vibrations of the TM ͑umbo͒ and stapes footplate were calculated from the model and measured from the temporal bones using laser Doppler vibrometers. The sound pressure in the middle ear cavity was derived from the model and measured from the bones. The results demonstrate that the TM perforations can be simulated in the FE model with geometrical visualization. The FE model provides reasonable predictions on effects of perforation size and location on middle ear transfer function. The middle ear structure-function relationship can be revealed with multi-field coupled FE analysis.

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Hearing loss in perforations of the tympanic membrane

Cited by 65 publications

References 5 publications

Pre-Operative and Post-Operative Assessment of Hearing following Tympanoplasty

Pre-Operative and Post-Operative Assessment of Hearing following Tympanoplasty

Tympanic membrane perforation: correlation of hearing loss with its site and size

Finite element modeling of sound transmission with perforations of tympanic membrane

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