大前庭水管综合征患儿人工耳蜗植入效果分析

目的比较大前庭水管综合征（1arge vestibular aqueduct syndrome，LVAS）和内耳结构正常人工耳蜗植入术后最大舒适阈值（most comfortab lelevel，M值）和神经反应成像阈值（neural response imaging threshold，tNRI值），为LVAS患者进行人工耳蜗植入术的可行性提供依据。方法将38例耳聋患儿根据CT检查结果分为A、B两组，A组32例，内耳结构正常；B组6例，双侧前庭导水管扩大，但不伴有其他内耳结构异常。所有患儿均植入美国Advanced Bionics公司生产的HiRes90K人工耳蜗系统。术后1个月左右安装体外设备并进行测试，使用与患儿年龄相应的行为测试方法进行舒适阈的测试；同时用SoundWave1．4调机软件行神经反应成像（neural response imaging，NRI）检测，记录tNRI值。结果两组术后1月开机时3、7、11和15号电极的M值和tNRI值的差异均无统计学意义（P〉0．05）。结论LVAS患儿并非人工耳蜗植入的禁忌，且术后调试时各指标的设定可参考内耳结构正常患儿的数值。

The Effects of Cochlear Implantation on Children with Large vestibular Aqueduct Syndrome

Objective The purpose of this study is to compare the most comfortable levels and neural re-sponse imaging threshold between children of cochlear implants with large vestibular aqueduct syndrome and normal inner ears. Methods Thirty-eight implanted children participated in this study and were divided into two groups. Group A consisted of 32 patients with normal inner ears and group B 6 patients with radiographically proven large vestibular aqueduct syndrome. All of the patients were the recipients of the cochlear implants by Advanced Bionics. The initial time for the first programming session was approximately one month after surgery. The psychophysical tests included M- level tests. Programming techniques used in the test were suitable for the age of patients. Sound-Wave 1.4 software was used to test tNRI. Results Using the rank sum test, M-level and tNRI of electrode 3,7,11 and 15 did not differ significantly between group A and B(P>0. 05). Conclusion The parameters of mapping are not significantly different between the implanted children with large vestibular aqueduct syndrome and normal inner ear. The management and procedures of mapping used to the subjects with normal inner ear can be applied to the children with large vestibular aqueduct syndrome.