Prevention of impulse noise-induced hearing loss with antioxidants.

Abstract:

CONCLUSION:These findings indicate a strong protective effect of ALCAR and NAC on impulse noise-induced cochlear damage, and suggest the feasibility of using clinically available antioxidant compounds to protect the ear from acute acoustic injury. OBJECTIVE:Reactive oxygen species have been shown to play a significant role in noise-induced hearing loss. In the current study, the protective effects of two antioxidants, acetyl-L-carnitine (ALCAR) and N-L-acetylcysteine (NAC), were investigated in a chinchilla model of hearing loss resulting from impulse noise. It was hypothesized that pre- and post-treatment with these antioxidants would ameliorate the effects of impulse noise compared to saline-treated controls. MATERIAL AND METHODS:Eighteen animals were randomly assigned to 1 of 3 groups and exposed to impulse noise at a level of 155 dB peak SPL for 150 repetitions. ALCAR or NAC were administered twice daily (b.i.d.) for 2 days and 1 h prior to and 1 h following noise exposure, and then b.i.d. for the following 2 days. For the control group, saline was injected at the same time points. Auditory brainstem responses (ABRs) were recorded. Cochlear surface preparations were made to obtain cytocochleograms. RESULTS:Three weeks after exposure, permanent threshold shifts for the experimental groups were significantly reduced to approximately = 10-30 dB less than that for the control group (p < 0.01). Less hair cell loss was also observed in the ALCAR and NAC groups than in the control group.

journal_name

Acta Otolaryngol

journal_title

Acta oto-laryngologica

authors

Kopke R,Bielefeld E,Liu J,Zheng J,Jackson R,Henderson D,Coleman JK

doi

10.1080/00016480410023038

subject

Has Abstract

pub_date

2005-03-01 00:00:00

pages

235-43

issue

3

eissn

0001-6489

issn

1651-2251

journal_volume

125

pub_type

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