Tympanometric measures in ears with negative middle ear pressure, and tests of some common assumptions.
Objective: To test the assumptions concerning the compensation of middle ear pressure (MEP) in using peak Ytm and the tympanogram asymmetry phenomenon, and to address the variability and reliability of 226 Hz tympanometry under negative MEP. Design: (1) Repeated measures in normal ears with experime...
| Publicado en: | International Journal of Audiology Vol. 52; no. 5; pp. 333 - 342 |
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| Autores principales: | , , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
May2013
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104267535&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104267535 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 14992027 JW2 jtl: International Journal of Audiology issn: 14992027 maglogo: Y pubinfo: dt: May2013 vid: 52 iid: 5 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 104267535 86864957 10.3109/14992027.2012.759664 NLM23343243 104267535 ppf: 333 ppct: 9 formats: fmt: @attributes: type: P tig: atl: Tympanometric measures in ears with negative middle ear pressure, and tests of some common assumptions. aug: au: Sun, Xiao-Ming Shaver, Mark D. Harader, Jason affil: Department of Communication Sciences and Disorders, Wichita State University, Wichita, Kansas, USA sug: subj: Acoustic Impedance Tests Evaluation Ear, Middle Pressure Human Repeated Measures Retrospective Design Analysis of Variance Pearson's Correlation Coefficient ab: Objective: To test the assumptions concerning the compensation of middle ear pressure (MEP) in using peak Ytm and the tympanogram asymmetry phenomenon, and to address the variability and reliability of 226 Hz tympanometry under negative MEP. Design: (1) Repeated measures in normal ears with experimentally-induced negative MEP; (2) Retrospective analysis of clinical data from ears with negative MEP. Study sample: Experimental data: 57 adult ears. Clinical data: 200 adult ears. Results: Mean peak Ytm significantly increased (˜ 0.10 mmhos) under negative MEPs (> − 190 daPa). TW increased, up to ˜50 daPa, for MEP ≤ − 130 daPa. Vea decreased when MEP ≤ − 190 daPa. With increasing negative MEP, peak Ytm and tympanogram gradient tended to decrease. The within-subject variation of all measures and difference between normal and negative MEP were small. Conclusions: The tympanometry procedure increases peak Ytm in ears with low to moderate negative MEP, and decreases gradient and Vea with high negative MEP. This is referred to as hypercorrection of the admittance and should be accounted for in clinical norms. Results imply that tympanogram asymmetry is due to divergent effects of air pressure on the middle ear. The variability of tympanometry does not increase and reliability not decrease under negative MEP. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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