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Hypobaric pressure exposure effects on cochlear frequency selectivity in fluctuating, low-frequency hearing loss

Published online by Cambridge University Press:  12 January 2009

K J Brännström  and
J Grenner
K J Brännström*
Affiliation:
Department of Clinical Science, Lund University, Sweden Malmö University Hospital, Sweden
J Grenner
Affiliation:
Department of Clinical Science, Lund University, Sweden Section of Audiology, ENT Department, Lund University Hospital, Sweden
*
Address for correspondence: K Jonas Brännström, Department of Audiology, SE-205 02 Malmö, Sweden. E-mail: [email protected]
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Abstract

Aim:

To study the effects of hypobaric pressure chamber exposure on the cochlear frequency selectivity of subjects with monaural, fluctuating, low-frequency hearing loss, such as occurs in Ménière's disease.

Methods:

We used a hypobaric pressure chamber to create relative underpressure in the ear canal, in order to impose positive pressure gradients on the inner ear. Psychophysical tuning curves, transiently evoked otoacoustic emissions and speech recognition scores in noise were measured in 10 subjects with fluctuating, low-frequency hearing loss, before and after pressure exposure.

Results:

After the exposure, subjects’ overall pure tone averages showed no improvement, but individual results showed improved speech recognition scores in noise (six subjects), increased transiently evoked otoacoustic emission strength (three subjects) and increased psychophysical tuning curve steepness (two subjects). Deteriorations were also seen, mainly in psychophysical tuning curves. No association could be established between the different tests, and the measured parameters could not predict subjective improvement.

Conclusion:

The results suggest variable effects of hypobaric pressure exposure on inner-ear physiology.

Keywords

Ménière's DiseaseInner EarOtoacoustic EmissionsAtmospheric PressureCochlea
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 123 , Issue 7 , July 2009 , pp. 710 - 717
Copyright
Copyright © JLO (1984) Limited 2009

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Footnotes

Presented at the second joint meeting of the Acoustical Society of America and the European Acoustical Association, Acoustics ’08, 29 June to 4 July 2008, Paris, France.

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