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Significance of a notch in the otoacoustic emission stimulus spectrum.

Grenner, Jan LU (2012) In Journal of Laryngology and Otology 126(9). p.897-901
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Laryngology and Otology
volume
126
issue
9
pages
897 - 901
publisher
Cambridge University Press
external identifiers
  • wos:000308381800004
  • pmid:22892219
  • scopus:84865211971
ISSN
1748-5460
DOI
10.1017/S0022215112001533
language
English
LU publication?
yes
id
9fe0eed1-801f-46d7-b677-f575bb61159d (old id 3047506)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/22892219?dopt=Abstract
date added to LUP
2012-09-05 19:35:48
date last changed
2017-01-01 07:41:23
@article{9fe0eed1-801f-46d7-b677-f575bb61159d,
  abstract     = {Objective: <br/><br>
To explain a clinical observation: a notch in the stimulus spectrum during transient evoked otoacoustic emission measurement in ears with secretory otitis media. <br/><br>
<br/><br>
Methods: <br/><br>
The effects of tympanic under-pressure were investigated using a pressure chamber. A model of the ear canal was also studied. <br/><br>
<br/><br>
Results: <br/><br>
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. <br/><br>
<br/><br>
Conclusion: <br/><br>
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.},
  author       = {Grenner, Jan},
  issn         = {1748-5460},
  language     = {eng},
  number       = {9},
  pages        = {897--901},
  publisher    = {Cambridge University Press},
  series       = {Journal of Laryngology and Otology},
  title        = {Significance of a notch in the otoacoustic emission stimulus spectrum.},
  url          = {http://dx.doi.org/10.1017/S0022215112001533},
  volume       = {126},
  year         = {2012},
}