The otoprotective effects of thermoreversible poloxamer 407 hydrogels containing dexamethasone or triamcinolone acetonide were evaluated in an animal model of noise-induced hearing loss. Seven days after noise exposure, hearing threshold shifts at 16 kHz were significantly reduced in the 6% dexamethasone group (p < 0.05). Even though no significant differences in hair cell counts were found, histological analysis revealed a significantly higher spiral ganglion cell density in the first turn of the cochlea in this group (p < 0.05). No otoprotective effects were observed after the application of the triamcinolone acetonide hydrogels. As the findings of this study indicate potential otoprotective effects of sustained topical dexamethasone delivery in the setting of noise-induced hearing loss, this strategy merits further evaluation. (C) 2018 S. Karger AG, Basel
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China Med Univ, Affiliated Hosp 1, Dept Otolaryngol Head & Neck Surg, Shenyang 110001, Liaoning, Peoples R ChinaChina Med Univ, Affiliated Hosp 1, Dept Otolaryngol Head & Neck Surg, Shenyang 110001, Liaoning, Peoples R China
Ding, Tonghui
Yan, Aihui
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China Med Univ, Affiliated Hosp 1, Dept Otolaryngol Head & Neck Surg, Shenyang 110001, Liaoning, Peoples R ChinaChina Med Univ, Affiliated Hosp 1, Dept Otolaryngol Head & Neck Surg, Shenyang 110001, Liaoning, Peoples R China
Yan, Aihui
Liu, Ke
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Capital Med Univ, Beijing Friendship Hosp, Dept Otolaryngol Head & Neck Surg, Beijing 100050, Peoples R ChinaChina Med Univ, Affiliated Hosp 1, Dept Otolaryngol Head & Neck Surg, Shenyang 110001, Liaoning, Peoples R China