Electrode Impedance Subcomponent Analysis in Cochlear Implant Patients with Rising or Fluctuating Electrode Impedances.

IF 1.8 Q1 AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGY

Audiology Research Pub Date : 2025-04-12 DOI:10.3390/audiolres15020041

Aniket A Saoji, Madison K Graham, Melissa D DeJong, Joscelyn R K Martin, Joerg Pesch, Filiep J Vanpoucke

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引用次数: 0

Abstract

Background/objectives: Electrode impedance is crucial for optimizing cochlear implant (CI) stimulation and hearing outcomes. While typically stable, some patients experience unexplained impedance fluctuations. This study used electrode impedance subcomponent analysis to identify the subcomponents contributing to these impedance fluctuations.

Methods: This study analyzed clinical electrode impedances and transimpedance matrix (TIM) measurements in 10 CI patients with Nucleus devices (CI422, CI522, or CI622 electrode arrays) who exhibited fluctuating or rising electrode impedances. TIM measurements used a cathodic-leading biphasic pulse (110 CLs, 75 µs/phase, 7 µs interphase interval). Electrode impedances were determined at 6, 12, 18, 24, and 75 µs, and subcomponents (access resistance [near-field/far-field] and polarization impedance [Warburg capacitance/Faraday resistance]) were calculated.

Results: Both access resistance and polarization impedance changes contributed to impedance fluctuations. Large changes in near-field resistance compared to far-field resistance were associated with increased resistance to current flow closer to the surface of the electrode. The decreased double-layer capacitance and slightly increased Faraday resistance further suggested increased resistance to charge transfer at the electrode-electrolyte interface.

Conclusions: Electrode impedance subcomponent analysis reveals changes in the electrochemical reaction at the electrode surface that cause fluctuating or rising CI electrode impedances.

查看原文本刊更多论文

耳蜗植入患者电极阻抗上升或波动的亚分量分析。

背景/目的：电极阻抗是优化人工耳蜗（CI）刺激和听力结果的关键。虽然通常稳定，但有些患者会出现无法解释的阻抗波动。本研究使用电极阻抗子分量分析来识别导致这些阻抗波动的子分量。方法：本研究分析了10例使用Nucleus devices （CI422、CI522或CI622电极阵列）的CI患者的临床电极阻抗和跨阻抗矩阵（TIM）测量结果，这些患者的电极阻抗表现为波动或上升。TIM测量采用阴极前导双相脉冲（110 CLs， 75µs/相，7µs相间间隔）。在6、12、18、24和75µs时测定电极阻抗，并计算子分量（接近电阻[近场/远场]和极化阻抗[Warburg电容/法拉第电阻]）。结果：接入电阻和极化阻抗的变化都对阻抗波动有影响。与远场电阻相比，近场电阻的巨大变化与靠近电极表面的电流阻力增加有关。双层电容的减小和法拉第电阻的轻微增加进一步表明电极-电解质界面的电荷转移阻力增加。结论：电极阻抗子分量分析揭示了电极表面电化学反应的变化导致CI电极阻抗波动或上升。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Audiology Research AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGY-

CiteScore

2.30

自引率

23.50%

发文量

审稿时长

11 weeks

期刊介绍： The mission of Audiology Research is to publish contemporary, ethical, clinically relevant scientific researches related to the basic science and clinical aspects of the auditory and vestibular system and diseases of the ear that can be used by clinicians, scientists and specialists to improve understanding and treatment of patients with audiological and neurotological disorders.