Henkin Yael, Kaplan-Neeman Ricky, Muchnik Chava, Kronenberg Jona, Hildesheimer Minka
Department of Communication Disorders, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
Int J Pediatr Otorhinolaryngol. 2003 Aug;67(8):873-80. doi: 10.1016/s0165-5876(03)00131-9.
The present study was designed to evaluate changes in psycho-electric parameters, i.e. threshold levels, comfortable levels, dynamic range, and electrode impedance values during the 1st year post-implantation, in children using the Nucleus 24M cochlear implant system.
The maps of 25 pre-lingual children programmed with ACE strategy in Monopolar 1 + 2 mode were examined at five time points: connection, 1, 3, 6, and 12 months post-initial stimulation. Maps and electrode impedance values were analyzed according to three cochlear segments: basal, medial, and apical.
Significant elevations of thresholds, comfortable levels, and dynamic range were found during the first few months of implant use. Specifically, threshold increased and dynamic range widened until the 3 months visit, whereas comfortable levels continued to increase until the 6 months visit, thereafter levels stabilized. Electrode impedance values decreased significantly from connection to the 1-month visit thereafter a stabilization of values was evident. In addition, thresholds and comfortable levels were found to be significantly lower in the apical segment, whereas dynamic range and electrode impedance values did not differ among the cochlear segments.
Significant changes in psycho-electric parameters and electrode impedance values were evident during the first 6 months of implant use. Given the important role of an optimal map for speech perception, frequent programming sessions during the first few months of implant use are essential.
本研究旨在评估使用Nucleus 24M人工耳蜗系统的儿童在植入后第1年中心理电参数的变化，即阈值水平、舒适水平、动态范围和电极阻抗值。
对25名采用单极1 + 2模式下ACE策略编程的语前儿童，在五个时间点进行检查：初次刺激后连接时、1个月、3个月、6个月和12个月。根据三个耳蜗节段：基底、中间和顶端，分析图谱和电极阻抗值。
在植入使用的最初几个月中，发现阈值、舒适水平和动态范围有显著升高。具体而言，阈值升高且动态范围扩大直至3个月随访时，而舒适水平持续升高直至6个月随访时，此后水平稳定。电极阻抗值从连接到1个月随访时显著下降，此后值趋于稳定。此外，发现顶端节段的阈值和舒适水平显著更低，而动态范围和电极阻抗值在耳蜗节段之间没有差异。
在植入使用的前6个月中，心理电参数和电极阻抗值有明显变化。鉴于最佳图谱对言语感知的重要作用，在植入使用的最初几个月中频繁进行编程调整至关重要。
