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:: Volume 23, Issue 2 (6-2014) ::
aud 2014, 23(2): 83-90 Back to browse issues page
Brainstem auditory evoked response characteristics in normal-hearing subjects with chronic tinnitus and in non-tinnitus group
Shadman Nemati 1, Abdorahim Kousha 1, Ali Faghih Habibi 1, Rasool Panahi 2
1- Department of Otolaryngology-Head and Neck Surgery, Guilan University of Medical Sciences, Rasht, Iran
2- Department of Audiology, Faculty of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
Abstract:   (7332 Views)

Background and Aim: While most of the people with tinnitus have some degrees of hearing impairment, a small percent of patients admitted to ear, nose and throat clinics or hearing evaluation centers are those who complain of tinnitus despite having normal hearing thresholds. This study was performed to better understanding of the reasons of probable causes of tinnitus and to investigate possible changes in the auditory brainstem function in normal-hearing patients with chronic tinnitus.

Methods: In this comparative cross-sectional, descriptive and analytic study, 52 ears (26 with and 26 without tinnitus) were examined. Components of the auditory brainstem response (ABR) including wave latencies and wave amplitudes were determined in the two groups and analyzed using appropriate statistical methods.

Results: The mean differences between the absolute latencies of waves I, III and V was less than 0.1 ms between the two groups that was not statistically significant. Also, the interpeak latency values of waves I-III, III-V and I-V in both groups had no significant difference. Only, the V/I amplitude ratio in the tinnitus group was significantly higher (p=0.04).

Conclusion: The changes observed in amplitude of waves, especially in the latter ones, can be considered as an indication of plastic changes in neuronal activity and its possible role in generation of tinnitus in normal-hearing patients.

Keywords: Tinnitus, normal hearing threshold, auditory brainstem response
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Type of Study: Research |
Received: 2013/04/7 | Accepted: 2013/06/2 | Published: 2014/02/1
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Volume 23, Issue 2 (6-2014) Back to browse issues page
شنوایی شناسی - دانشگاه علوم پزشکی تهران Bimonthly Audiology - Tehran University of Medical Sciences
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