Xi Xin, Hong Meng-di, Han Dong-yi, Huang De-liang, Yang Wei-yan
Department of Otolaryngology-Head & Neck Surgery, Chinese PLA General Hospital, Beijing 100853, China.
Zhonghua Er Bi Yan Hou Ke Za Zhi. 2003 Feb;38(1):43-6.
To investigate the possibility of using pediatric cochlear implant mapping protocol, to estimate the psychophysical levels based on the electrically evoked compound action potential (ECAP) threshold measured with the neural response telemetry (NRT) capabilities of cochlear corporation's CI24M device.
ECAP amplitude growth functions were regressed via NRT 3.0 software to determine ECAP threshold. 6 pediatric cochlear implant recipients' ECAP thresholds 1, 2 and 3 months after surgery were compared, meanwhile, intraoperative and postoperative ECAP thresholds in 7 pediatric recipients were compared.
The ECAP amplitude growth functions were not linear when ECAP was close to threshold or saturation. There were no significant difference among the ECAP thresholds 1, 2 and 3 months after surgery. The average intraoperative ECAP threshold of 22 electrodes was 15 CL greater than postoperative threshold. It showed high relationship between them (R2 = 0.9154).
ECAP threshold should be determined by regression of data from linear part of amplitude growth function. Only one NRT trial should be assessed when mapping protocol based on ECAP threshold to estimate pediatric map parameter. The intraoperative ECAP threshold can act as C-level at the initial mapping. Key words cochlear implant, electrically evoked compound action potential, mapping.
探讨使用儿童人工耳蜗调图方案，根据通过科利耳公司CI24M设备的神经反应遥测（NRT）功能测得的电诱发复合动作电位（ECAP）阈值来估计心理物理学水平的可能性。
通过NRT 3.0软件对ECAP幅度增长函数进行回归分析以确定ECAP阈值。比较了6名儿童人工耳蜗植入受者术后1、2和3个月的ECAP阈值，同时比较了7名儿童受者术中及术后的ECAP阈值。
当ECAP接近阈值或饱和时，其幅度增长函数不是线性的。术后1、2和3个月的ECAP阈值之间无显著差异。22个电极的术中平均ECAP阈值比术后阈值高15 CL。它们之间显示出高度相关性（R2 = 0.9154）。
ECAP阈值应由幅度增长函数线性部分的数据回归确定。基于ECAP阈值进行调图方案以估计儿童调图参数时，仅应评估一次NRT试验。术中ECAP阈值可作为初始调图时的C级。关键词人工耳蜗；电诱发复合动作电位；调图
