Document Detail

Significance of a notch in the otoacoustic emission stimulus spectrum.
MedLine Citation:
PMID:  22892219     Owner:  NLM     Status:  MEDLINE    
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.
J Grenner
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of laryngology and otology     Volume:  126     ISSN:  1748-5460     ISO Abbreviation:  J Laryngol Otol     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-08-15     Completed Date:  2013-05-09     Revised Date:  2014-07-31    
Medline Journal Info:
Nlm Unique ID:  8706896     Medline TA:  J Laryngol Otol     Country:  England    
Other Details:
Languages:  eng     Pagination:  897-901     Citation Subset:  AIM; IM    
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MeSH Terms
Age Factors
Child, Preschool
Ear Canal / anatomy & histology,  physiology
Evoked Potentials, Auditory*
Models, Anatomic
Otitis Media with Effusion / physiopathology*
Otoacoustic Emissions, Spontaneous / physiology*
Tympanic Membrane / physiopathology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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