High noise levels lead to increased cytoplasmatic concentration of reactive oxygen species in the hair cells (HC) of the inner ear. In a guinea pig model, the therapeutic potential of the antioxidative agents α-lipoic acid, l-carnitine, and d-methionine for acoustic trauma was investigated. After 2.5 hours of exposure on 2 consecutive days to either broadband noise (BB) (115 dB SPL, n = 61 ears) or rock music (RM) (112 dB SPL, n = 62 ears), the antioxidative agents were injected intraperitoneally for 1 week. The auditory threshold was measured from 1.5 to 16 kHz prior to noise and at days 1, 3, 7, and 21 post-exposure using brainstem evoked response audiometry (BERA) and the distortion products of otoacoustic emissions (DPOAE). Both BB and RM damage the outer HC; RM also damages the inner HC. Partial recovery occurred during the first 3 days after exposure. Ultimately, it was demonstrated that none of the antioxidative agents utilized in this study show a therapeutic effect on acoustic trauma in the guinea pig after exposure to either BB or RM.
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High noise levels lead to increased cytoplasmatic concentration of reactive oxygen species in the hair cells (HC) of the inner ear. In a guinea pig model, the therapeutic potential of the antioxidative agents α-lipoic acid, l-carnitine, and d-methionine for acoustic trauma was investigated. After 2.5 hours of exposure on 2 consecutive days to either broadband noise (BB) (115 dB SPL, n = 61 ears) or rock music (RM) (112 dB SPL, n = 62 ears), the antioxidative agents were injected intraperitoneall...
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