直电极与弯电极人工耳蜗植入患者神经兴奋分布空间的比较

Comparison of Neural Excitation Spread in the Cochlear Implant between Recipients with Straight and Contour Electrode Arrays

冀飞;郗昕;洪梦迪;陈艾婷;刘军;韩东一;

1:解放军总医院耳鼻咽喉-头颈外科

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摘要

目的比较Nucleus 24M型直电极与Nucleus 24 Contour型弯电极人工耳蜗植入患者的神经兴奋分布空间的宽度,评估电极类型和电极位置对于电极间刺激干扰程度的影响。方法18名人工耳蜗植入患儿分为两组,其中24M和24Contour植入患者各9名,年龄1.37.9岁。按照病因、病程、植入年龄、电极植入角度4个因素将两组患者进行配对。使用NRT3.1测试软件分别对每名患者的5、10、15三个电极进行听神经电诱发复合动作电位(electrically evoked compound action potential,ECAP)测试。测试时,探测脉冲固定加在测试电极,掩蔽脉冲按顺序分别加到1至22号电极,得出一系列的ECAP波形,将ECAP波形幅度从最高降到70.7%所覆盖的电极范围定义为神经兴奋分布空间的宽度。分析电极类型、电极位置这两个因素对神经兴奋分布空间宽度的影响。结果电极类型、电极位置对神经兴奋分布空间宽度有显著影响。弯电极的兴奋空间分布宽度在5、10、15号三个电极位置均显著窄于直电极组。5、10号电极的兴奋空间窄于15号电极,但5号和10号电极之间无统计学差异。结论在耳蜗的底部和中部,Nucleus24 Contour弯电极的电极间刺激干扰小于直电极,有助于提高患者中、高频的电极分辨能力。

关键词

耳蜗植入;电刺激;电极

基金项目(Foundation):

作者

冀飞;郗昕;洪梦迪;陈艾婷;刘军;韩东一;

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耳蜗植入电刺激电极

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冀飞郗昕洪梦迪陈艾婷刘军韩东一