Document Detail

Tinnitus loudness in quiet and noise after resection of vestibular schwannoma.
MedLine Citation:
PMID:  21221046     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: (1) To use a loudness model to assess the influence of loudness recruitment on estimates of the loudness of tinnitus obtained by loudness matching; (2) To compare the effect of background noise on the loudness of tinnitus for individuals who are unilaterally deaf after resection of vestibular schwannoma (VS) and those with idiopathic tinnitus.
BACKGROUND: After translabyrinthine resection of VS, patients experience unilateral deafness and tinnitus in the operated ear. Most complain that their tinnitus is more bothersome in noisy environments, unlike those with idiopathic tinnitus.
PARTICIPANTS: Unilaterally deaf individuals experiencing tinnitus as a consequence of VS surgery and a comparison group with idiopathic tinnitus.
METHODS: Participants adjusted the level of a probe tone at the frequency where their hearing was best to match the loudness of their tinnitus in quiet; for VS participants, matches were made using a probe in the unaffected ear. Matches were then obtained in the presence of threshold-equalizing noise.
RESULTS: For those with idiopathic tinnitus, the probe loudness level, calculated using a loudness model, was almost invariant with hearing loss at the probe frequency and was usually between 20 and 50 phons. For the VS group, the probe loudness level ranged from 6 to 51 phons. With increasing threshold-equalizing-noise level, the loudness match decreased slightly for the comparison group but increased significantly for the VS group.
CONCLUSION: The tinnitus in quiet had a moderate loudness for both groups. Background noise slightly decreased tinnitus loudness for most participants with idiopathic tinnitus but increased tinnitus loudness for VS participants. We propose 2 possible mechanisms for the effect of noise in the VS group.
Thomas Edmund Cope; David M Baguley; Brian C J Moore
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology     Volume:  32     ISSN:  1537-4505     ISO Abbreviation:  Otol. Neurotol.     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-07-15     Completed Date:  2011-11-15     Revised Date:  2014-02-20    
Medline Journal Info:
Nlm Unique ID:  100961504     Medline TA:  Otol Neurotol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  488-96     Citation Subset:  IM    
Copyright Information:
© 2011, Otology & Neurotology, Inc.
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MeSH Terms
Acoustic Stimulation
Loudness Perception / physiology*
Middle Aged
Neuroma, Acoustic / complications,  physiopathology,  surgery*
Tinnitus / etiology,  physiopathology*,  surgery
Treatment Outcome
Grant Support
G0701870//Medical Research Council; //Medical Research Council

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

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