CC BY-NC-ND 4.0 · Int Arch Otorhinolaryngol 2022; 26(04): e730-e737
DOI: 10.1055/s-0042-1748533
Original Research

Wideband Acoustic Absorbance in Otosclerosis: Does Stapedotomy Restore Normal Tympanic Cavity Function?*

Alessandra Spada Durante 
1   Faculty of Speech-Language Pathology and Audiology, Faculdade de Ciências Médicas da Santa Casa de São Paulo, São Paulo, SP, Brazil
,
Polyana Cristiane Nascimento
1   Faculty of Speech-Language Pathology and Audiology, Faculdade de Ciências Médicas da Santa Casa de São Paulo, São Paulo, SP, Brazil
,
Katia de Almeida
1   Faculty of Speech-Language Pathology and Audiology, Faculdade de Ciências Médicas da Santa Casa de São Paulo, São Paulo, SP, Brazil
,
Thamyris Rosati Servilha
2   Department of Otorhinolaryngology, Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, SP, Brazil
,
Gil Junqueira Marçal
2   Department of Otorhinolaryngology, Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, SP, Brazil
,
Osmar Mesquita de Sousa Neto
3   Department of Otorhinolaryngology, Escola de Ciências Médicas da Santa Casa de São Paulo. R. Dr. Cesário Mota Júnior, São Paulo, SP, Brazil
› Author Affiliations Financial Support FAPESP 2014/15810-0.
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Abstract

Introduction Otosclerosis is characterized by the fixation of the stapes to the oval window, thereby impairing acoustic signal absorbance. A commonly used surgical technique for improving hearing in cases of otosclerosis is stapedotomy. However, it is unclear whether this surgery restores all the physical characteristics of the tympano-ossicular system.

Objective To evaluate the tympano-ossicular system in individuals with fenestral otosclerosis pre and poststapedotomy using wideband tympanometry.

Method A total of 47 individuals and 71 ears were assessed. The subjects were divided into three groups: presurgery otosclerosis; postsurgery; and a control group of normal-hearing adults. A handheld tympanometer with a wideband module (226–8,000 Hz) was used to take measurements at ambient pressure and under pressurized conditions. The level of statistical significance adopted was p ≤ 0.05.

Results Acoustic absorbance at 226 Hz was low for all groups. At frequencies in the range 630 to 5,040 Hz, each group had a characteristic absorbance curve, allowing them to be distinguished from one another. In the presurgery group, absorbance values were below normal levels, with energy absorbance below 10%. Low energy absorbance was most evident at 1,000 Hz in the presurgery group, but this was not observed in the postsurgery group. Although there was an improvement in hearing, the surgery failed to restore the tympano-ossicular system to normal.

Conclusion Wideband acoustic absorbance proved able to differentiate normal ears and otosclerotic ears pre and postsurgery, under both ambient pressure and pressurized conditions.

Keywords

middle ear - acoustic impedance tests - otosclerosis

* Work developed at Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo/SP, Brazil.




Publication History

Received: 24 March 2021

Accepted: 14 February 2022

Article published online:
17 June 2022

© 2022. Fundação Otorrinolaringologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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