Velandia Sandra, Martinez Diane, Goncalves Stefania, Pena Stefanie, Bas Esperanza, Ein Liliana, Prentiss Sandra, Telischi Fred, Angeli Simon, Dinh Christine T
Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL, USA.
Cochlear Implants Int. 2020 Nov;21(6):344-352. doi: 10.1080/14670100.2020.1788859. Epub 2020 Jul 8.
To determine the impact of age, electrode array, and time on impedance patterns in cochlear implant (CI) patients. A retrospective case review was performed on 98 patients implanted with the CI24RE perimodiolar (PM) and CI422 lateral wall (LW) arrays between 2010 and 2014 to assess impedances at the 1 week and 3-6 month visit after initial stimulation (IS). With respect to age, impedances were higher in young patients compared to older patients in the middle and apical turns. With time, there were significant reductions in impedances across most electrodes. Electrode array type also had a significant impact on impedance measurements with PM and LW arrays having higher impedances in the basal turn and apical turns, respectively. Furthermore, PM arrays demonstrated significantly lower impedances in the middle and apical turn with time, when compared to LW arrays. Age, electrode array, and time can independently affect CI impedances. Moreover, we show that PM arrays may be advantageous to LW arrays, due to demonstrated lower impedances in the middle and apical turns long term. Understanding the impact of impedance on speech discrimination and determining the intracochlear processes that contribute to differences in impedance are future research directions.
为确定年龄、电极阵列和时间对人工耳蜗（CI）植入患者阻抗模式的影响。对98例在2010年至2014年间植入CI24RE蜗周（PM）电极阵列和CI422侧壁（LW）电极阵列的患者进行了回顾性病例分析，以评估初次刺激（IS）后1周和3 - 6个月随访时的阻抗。在年龄方面，年轻患者中、蜗顶 turns的阻抗高于老年患者。随着时间推移，大多数电极的阻抗显著降低。电极阵列类型对阻抗测量也有显著影响，PM和LW电极阵列分别在蜗底turn和蜗顶turn具有较高的阻抗。此外，与LW电极阵列相比，PM电极阵列在中turn和蜗顶turn随时间显示出显著更低的阻抗。年龄、电极阵列和时间可独立影响CI阻抗。此外，我们表明，由于长期在中turn和蜗顶turn显示出较低的阻抗，PM电极阵列可能比LW电极阵列更具优势。了解阻抗对言语辨别力的影响以及确定导致阻抗差异的蜗内过程是未来的研究方向。
