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首页> 外文期刊>ORL: Journal for oto-rhino-laryngology and its borderlands >Protection of inner ear function after cochlear implantation: compound action potential measurements after local application of glucocorticoids in the guinea pig cochlea.
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Protection of inner ear function after cochlear implantation: compound action potential measurements after local application of glucocorticoids in the guinea pig cochlea.

机译:人工耳蜗植入后保护内耳功能:在豚鼠耳蜗局部应用糖皮质激素后的复合动作电位测量。

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摘要

BACKGROUND: Cochlear implant users with residual hearing often benefit greatly from simultaneous electric and acoustic stimulation. However, implantation can cause trauma to the inner ear, resulting in poorer hearing postoperatively. We investigated whether a single local injection of glucocorticoids can reduce hearing loss in long-term implanted guinea pigs. METHODS: Three groups of animals underwent bilateral surgery. One ear was implanted with an electrode, and the contralateral ear received a cochleostomy only. A single dose of the glucocorticoids triamcinolone or dexamethasone, or of artificial perilymph was infused into cochleae via cochleostomy. Compound action potentials were measured before and after application and for 3 months postoperatively. Tissue growth was measured as the percentage of the total area of the scala tympani that was obliterated. RESULTS: Ears subjected to cochleostomy only and treated with glucocorticoids demonstrated a mild hearing loss. In the implanted ears, both glucocorticoids preserved hearing at least temporarily. The volume of tissue growth within the scala tympani was not reduced, and there was no relation between the amount of tissue and hearing loss. CONCLUSIONS: Both glucocorticoids show a potential benefit for hearing preservation in implanted ears. Glucocorticoid therapy may be useful to protect residual hearing during cochlear implantation.
机译:背景:具有残余听力的人工耳蜗使用者通常会从同时进行的电和声刺激中受益匪浅。但是,植入可能会伤及内耳,导致术后听力下降。我们调查了在长期植入的豚鼠中,单次局部注射糖皮质激素是否可以减少听力损失。方法:三组动物接受了双侧手术。一只耳朵植入电极,对侧耳朵仅接受耳蜗切开术。通过耳蜗切开术将单剂量的糖皮质激素曲安西龙或地塞米松或人工外周淋巴液注入耳蜗。在应用前后和术后3个月测量复合动作电位。将组织生长测量为闭塞的鼓ala总面积的百分比。结果:仅接受耳蜗切开术并用糖皮质激素治疗的耳朵表现出轻度听力下降。在植入的耳朵中,两种糖皮质激素都至少暂时保留了听力。鼓sc内组织生长的体积没有减少,组织数量与听力损失之间没有关系。结论:两种糖皮质激素均显示出对植入耳朵的听力保护的潜在益处。糖皮质激素疗法可能有助于保护人工耳蜗植入过程中的残余听力。

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