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The Relationship Between Ultra-High Frequency Thresholds and Transient Evoked Otoacoustic Emissions in Adults With Tinnitus



Omidvar S1 ; Jafari Z2 ; Mahmoudian S3 ; Khabazkhoob M4 ; Ahadi M1 ; Yazdani N5
Authors
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Authors Affiliations
  1. 1. Department of Audiology, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
  2. 2. Department of Rehabilitation Basic Science, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
  3. 3. Neck Research Center, Iran University of Medical Sciences, Tehran, Iran
  4. 4. Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  5. 5. Otorhinolaryngology Research Centre, AmirAlam Hospital, Tehran University of Medical Sciences, Tehran, Iran

Source: Medical Journal of the Islamic Republic of Iran Published:2016

Abstract

Background: The possible role of cochlear function in tinnitus generation is still a matter of debate. To assess the role of outer hair cell dysfunction in tinnitus and its possible relationship with ultra-high frequency (UHF) hearing sensitivity, transient evoked otoacoustic emissions (TEOAE) and UHF hearing thresholds were investigated in normal hearing individuals with and without tinnitus. Methods: Eighteen individuals with tinnitus and 22 without tinnitus participated in this study. TEOAE was recorded with click stimulus at 80 dBpeSPL. UHF pure tone audiometry was performed at 10, 12.5, 16, and 18 kHz. Results: TEOAE was significantly abnormal in 72.2% of the tinnitus, and 18.2% of the control groups (p=0.001). The individuals with tinnitus had significantly poorer UHF hearing sensitivity compared to the control group at 12.5 and 18 kHz (p ≤ 0.048). There was a stronger correlation between increasing UHFs hearing threshold and decreasing SNRs of TEOAEs in the tinnitus group compared to the controls. Conclusion: Our study revealed poorer UHF hearing thresholds and more TEOAE abnormalities in normal hearing individuals with tinnitus compared to the controls. Perhaps the alterations in the basal cochlea, following a decrease in UHF hearing sensitivity, affect OAEs that are originated from more apical cochlear parts in tinnitus ears more than non-tinnitus ears.