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Background and Objectives:Salicylates are well-known for producing reversible hearing loss and tinnitus. However, the site and mechanism of salicylate ototoxicity remain unresolved. Recent experiments sugest that reversible biochemical and/ or metabolic changes in the cochlea seem to play an important role in salicylate ototoxicity. The purpose of this study was to Materials and Method:ABRs and DPOAEs were observed after intraperitoneal injection of 500 mg/kg of sodium salicylate on 24 ears of guinea pigs. Results:Salicylate pro-duced a significant increase in the ABR threshold. Maximum changes were obtained in 4 hours, and recovered to the base-line in 24 hours after salicylate administration. The pattern of hearing loss shown by latency-intensity function was compatible with the cochlear type of hearing loss. The echo amplitude on DPOAEs at f2=2, 4, 6, 8 hours, and returned to the baseline in 24 hours after salicylate administration. The time course of the change of DP-OAEs was parallel with that of ABRs. Conclusion:These results reflect that the cochlear outer hair cells may be the main site of lesion in salicylate ototoxicity. (Korean J Otolaryngol 2002;45:646-50)

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