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Fundamental Concepts for Assessment and Interpretation of Wideband Acoustic Immittance Measurements

Assessment of middle ear impedance using noninvasive electroacoustic measurements has undergone successive developments since its first clinical application in the 1940s, and gained widespread adoption since the 1970s in the form of 226-Hz tympanometry, and applications in multifrequency tympanometr...

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Autores principales: AlMakadma, Hammam, Kei, Joseph, Yeager, David, Feeney, M. Patrick
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Thieme Medical Publishers, Inc. 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10014203/
https://www.ncbi.nlm.nih.gov/pubmed/36925657
http://dx.doi.org/10.1055/s-0043-1763293
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author AlMakadma, Hammam
Kei, Joseph
Yeager, David
Feeney, M. Patrick
author_facet AlMakadma, Hammam
Kei, Joseph
Yeager, David
Feeney, M. Patrick
author_sort AlMakadma, Hammam
collection PubMed
description Assessment of middle ear impedance using noninvasive electroacoustic measurements has undergone successive developments since its first clinical application in the 1940s, and gained widespread adoption since the 1970s in the form of 226-Hz tympanometry, and applications in multifrequency tympanometry. More recently, wideband acoustic immittance (WAI) is allowing unprecedented assessments of the middle ear acoustic mechanics thanks to the ability to record responses over a wide range of frequencies. The purpose of this article is to present fundamental concepts for the assessment and interpretation of wideband measures, including a review of acoustic impedance and its relation to the mass, stiffness, and resistance components of the middle ear. Additionally, an understanding of the middle ear transfer function reveals the relationship between impedance and middle-ear gain as a function of frequency. Wideband power absorbance, a WAI measure, quantifies the efficiency of sound conduction through the middle ear over a wide range of frequencies, and can serve as an analogous clinical measure to the transfer function. The interpretation of absorbance measures in ears with or without a conductive condition using absorbance measured at ambient pressure and pressurized conditions (wideband tympanometry) is described using clinical case examples. This article serves as an introduction to the fundamental principles of WAI measurements.
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spelling pubmed-100142032023-03-15 Fundamental Concepts for Assessment and Interpretation of Wideband Acoustic Immittance Measurements AlMakadma, Hammam Kei, Joseph Yeager, David Feeney, M. Patrick Semin Hear Assessment of middle ear impedance using noninvasive electroacoustic measurements has undergone successive developments since its first clinical application in the 1940s, and gained widespread adoption since the 1970s in the form of 226-Hz tympanometry, and applications in multifrequency tympanometry. More recently, wideband acoustic immittance (WAI) is allowing unprecedented assessments of the middle ear acoustic mechanics thanks to the ability to record responses over a wide range of frequencies. The purpose of this article is to present fundamental concepts for the assessment and interpretation of wideband measures, including a review of acoustic impedance and its relation to the mass, stiffness, and resistance components of the middle ear. Additionally, an understanding of the middle ear transfer function reveals the relationship between impedance and middle-ear gain as a function of frequency. Wideband power absorbance, a WAI measure, quantifies the efficiency of sound conduction through the middle ear over a wide range of frequencies, and can serve as an analogous clinical measure to the transfer function. The interpretation of absorbance measures in ears with or without a conductive condition using absorbance measured at ambient pressure and pressurized conditions (wideband tympanometry) is described using clinical case examples. This article serves as an introduction to the fundamental principles of WAI measurements. Thieme Medical Publishers, Inc. 2023-03-01 /pmc/articles/PMC10014203/ /pubmed/36925657 http://dx.doi.org/10.1055/s-0043-1763293 Text en The Author(s). 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 commercial purposes, or adapted, remixed, transformed or built upon. ( https://creativecommons.org/licenses/by-nc-nd/4.0/ ) https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.
spellingShingle AlMakadma, Hammam
Kei, Joseph
Yeager, David
Feeney, M. Patrick
Fundamental Concepts for Assessment and Interpretation of Wideband Acoustic Immittance Measurements
title Fundamental Concepts for Assessment and Interpretation of Wideband Acoustic Immittance Measurements
title_full Fundamental Concepts for Assessment and Interpretation of Wideband Acoustic Immittance Measurements
title_fullStr Fundamental Concepts for Assessment and Interpretation of Wideband Acoustic Immittance Measurements
title_full_unstemmed Fundamental Concepts for Assessment and Interpretation of Wideband Acoustic Immittance Measurements
title_short Fundamental Concepts for Assessment and Interpretation of Wideband Acoustic Immittance Measurements
title_sort fundamental concepts for assessment and interpretation of wideband acoustic immittance measurements
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10014203/
https://www.ncbi.nlm.nih.gov/pubmed/36925657
http://dx.doi.org/10.1055/s-0043-1763293
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