| Significance of a notch in the otoacoustic emission stimulus spectrum. | |
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MedLine Citation:
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PMID: 22892219 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Objective: To explain a clinical observation: a notch in the stimulus spectrum during transient evoked otoacoustic emission measurement in ears with secretory otitis media. Methods: The effects of tympanic under-pressure were investigated using a pressure chamber. A model of the ear canal was also studied. Results: Tympanic membrane reflectance increased as a consequence of increased stiffness, causing a notch in the stimulus spectrum. In an adult, the notch could be clearly distinguished at an under-pressure of approximately -185 daPa. The sound frequency of the notch corresponded to a wavelength four times the ear canal length. The ear canal of infants was too short to cause a notch within the displayed frequency range. The notch was demonstrated using both Otodynamics and Madsen equipment. Conclusion: A notch in the otoacoustic emission stimulus spectrum can be caused by increased stiffness of the tympanic membrane, raising suspicion of low middle-ear pressure or secretory otitis media. This finding is not applicable to infants. |
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Authors:
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J Grenner |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of laryngology and otology Volume: 126 ISSN: 1748-5460 ISO Abbreviation: J Laryngol Otol Publication Date: 2012 Sep |
Date Detail:
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Created Date: 2012-08-15 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8706896 Medline TA: J Laryngol Otol Country: England |
Other Details:
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Languages: eng Pagination: 897-901 Citation Subset: AIM; IM |
Affiliation:
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Department of Clinical Sciences, Lund University, Lund, Sweden. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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