Document Detail

Tinnitus associated spontaneous otoacoustic emissions. Active outer hair cell movements as common origin?
MedLine Citation:
PMID:  2284909     Owner:  NLM     Status:  MEDLINE    
In the mammalian inner ear, active mechanical processes contribute to cochlear micromechanics. Direct evidence of these are spontaneous otoacoustic emissions (SOAE) which have been registered in the human and animal ear canal. In mammals, outer hair cells (OHC) seem to be the origin of this mechanical energy, because they exhibit motile responses to various stimuli. Here we report on bilateral tinnitus and bilateral SOAE with both acoustical phenomena located in the same frequency range. In a playback of the SOAEs their frequences were identified as the pitch of the tinnitus. An additional criterion favoring a common pathomechanism of SOAEs and tinnitus resulted from masking effects. Tinnitus and SOAEs from both sides were suppressed by the same tone, which indicates that the involved pathways are identical. Therefore we suggest that pathological long-term movements of only a small number of OHCs underlie both phenomena. From the SOAE emission spectra we calculated that not more than 60 OHCs might be involved.
P K Plinkert; A H Gitter; H P Zenner
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Publication Detail:
Type:  Case Reports; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta oto-laryngologica     Volume:  110     ISSN:  0001-6489     ISO Abbreviation:  Acta Otolaryngol.     Publication Date:    1990 Nov-Dec
Date Detail:
Created Date:  1991-03-20     Completed Date:  1991-03-20     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0370354     Medline TA:  Acta Otolaryngol     Country:  SWEDEN    
Other Details:
Languages:  eng     Pagination:  342-7     Citation Subset:  IM    
Department of Otolaryngology, University of Tübingen, Germany.
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MeSH Terms
Cochlea / physiopathology*
Hair Cells, Auditory / physiopathology*
Perceptual Masking
Tinnitus / etiology*,  physiopathology

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

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