Document Detail

Evaluation of cochlear function in patients with normal hearing and tinnitus: a distortion product otoacoustic emission study.
MedLine Citation:
PMID:  12970589     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: We investigated cochlear function in normal-hearing patients with tinnitus using distortion product otoacoustic emissions (DPOAE). PATIENTS AND METHODS: The study included 20 normal-hearing patients with tinnitus (13 males, 7 females; mean age 25 years; range 17 to 52 years) and 15 controls (10 males, 5 females; mean age 23 years; range 18 to 27 years) with normal hearing. Both groups underwent routine audiological tests including audiometry and tympanometry. Cubic DPOAEs were recorded from both groups. Signal-to-noise ratios (SNRs) lower than the 10th percentile of the control values were regarded as abnormal or undetectable. RESULTS: Tinnitus was bilateral in seven patients and unilateral in 13 patients. Seven patients with unilateral tinnitus and all patients with bilateral tinnitus had a history of exposure to noise. The mean perceived frequencies for tinnitus were 6.3 kHz and 6.2 kHz in the left and right ears, respectively. Loudness was measured as 8 dB SL in the left ears, and 7 dB SL in the right ears. Compared to unilateral cases, patients with bilateral tinnitus exhibited a higher percentage of abnormal SNRs at most frequencies. Some asymptomatic ears in the patient group had abnormal results. CONCLUSION: These findings show that tinnitus in normal-hearing patients is often associated with varying degrees of cochlear dysfunction. The results also suggest that tinnitus may be regarded as an early manifestation of noise-induced hearing loss in patients with a history of exposure to noise.
Bülent Satar; Osman Kapkin; Yalçin Ozkaptan
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Publication Detail:
Type:  Evaluation Studies; Journal Article    
Journal Detail:
Title:  Kulak burun boğaz ihtisas dergisi : KBB = Journal of ear, nose, and throat     Volume:  10     ISSN:  1300-7475     ISO Abbreviation:  Kulak Burun Bogaz Ihtis Derg     Publication Date:  2003 May 
Date Detail:
Created Date:  2003-09-12     Completed Date:  2003-11-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100899230     Medline TA:  Kulak Burun Bogaz Ihtis Derg     Country:  Turkey    
Other Details:
Languages:  eng     Pagination:  177-82     Citation Subset:  IM    
Department of Otolaryngology, Gülhane Military Medical School, Ankara, Turkey.
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MeSH Terms
Audiometry, Pure-Tone*
Auditory Threshold*
Case-Control Studies
Cochlea / physiology*
Evoked Potentials, Auditory
Functional Laterality
Hearing Loss, Noise-Induced / diagnosis,  physiopathology
Middle Aged
Otoacoustic Emissions, Spontaneous*
Tinnitus / diagnosis*,  physiopathology*

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

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