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Evaluation of cochlear function in patients with normal hearing and tinnitus: a distortion product otoacoustic emission study.
Kulak Burun Bogaz Ihtis Derg. 2003 May; 10(5):177-82.KB

Abstract

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.

Authors+Show Affiliations

Department of Otolaryngology, Gülhane Military Medical School, Ankara, Turkey. bsatar@ixir.comNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article

Language

eng

PubMed ID

12970589

Citation

Satar, Bülent, et al. "Evaluation of Cochlear Function in Patients With Normal Hearing and Tinnitus: a Distortion Product Otoacoustic Emission Study." Kulak Burun Bogaz Ihtisas Dergisi : KBB = Journal of Ear, Nose, and Throat, vol. 10, no. 5, 2003, pp. 177-82.
Satar B, Kapkin O, Ozkaptan Y. Evaluation of cochlear function in patients with normal hearing and tinnitus: a distortion product otoacoustic emission study. Kulak Burun Bogaz Ihtis Derg. 2003;10(5):177-82.
Satar, B., Kapkin, O., & Ozkaptan, Y. (2003). Evaluation of cochlear function in patients with normal hearing and tinnitus: a distortion product otoacoustic emission study. Kulak Burun Bogaz Ihtisas Dergisi : KBB = Journal of Ear, Nose, and Throat, 10(5), 177-82.
Satar B, Kapkin O, Ozkaptan Y. Evaluation of Cochlear Function in Patients With Normal Hearing and Tinnitus: a Distortion Product Otoacoustic Emission Study. Kulak Burun Bogaz Ihtis Derg. 2003;10(5):177-82. PubMed PMID: 12970589.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluation of cochlear function in patients with normal hearing and tinnitus: a distortion product otoacoustic emission study. AU - Satar,Bülent, AU - Kapkin,Osman, AU - Ozkaptan,Yalçin, PY - 2003/9/13/pubmed PY - 2003/12/3/medline PY - 2003/9/13/entrez SP - 177 EP - 82 JF - Kulak burun bogaz ihtisas dergisi : KBB = Journal of ear, nose, and throat JO - Kulak Burun Bogaz Ihtis Derg VL - 10 IS - 5 N2 - 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. SN - 1300-7475 UR - https://www.unboundmedicine.com/medline/citation/12970589/Evaluation_of_cochlear_function_in_patients_with_normal_hearing_and_tinnitus:_a_distortion_product_otoacoustic_emission_study_ L2 - https://www.diseaseinfosearch.org/result/9653 DB - PRIME DP - Unbound Medicine ER -