Objective: 

To evaluate a possible correlation between impedance values and speech perception after cochlear implantation.

Study Design: 

Retrospective chart review.

Setting: 

Tertiary referral center.

Patients and Intervention: 

All patients implanted with a MedEl Flex28 device in our department with complete audiometric data (Freiburger monosyllabic testing at 65 dB, Hochmaier–Schulz–Moser testing in quiet and in 10 dB noise) and impedance measurements at the 1-year refitting appointment were enrolled in this study. Further inclusion criteria were age > 17 years, native speakers, and no use of electric-acoustic-stimulation.

Main Outcome Measures: 

Mean values for impedances were calculated over all electrode contacts and separately for basal, medial, and apical regions. These data were correlated statistically (Pearson's correlation) with speech testing results. Furthermore, groups of patients with extreme values were built and compared against each other and against the rest of the collective.

Results: 

Impedance values did not correlate significantly with speech performance in any of the audiometric tests neither for all electrode contacts nor for specific clusters of contacts. Patients with the lowest impedances did not perform statistically different than patients with the highest impedances in any condition.

Conclusion: 

To our knowledge, this is the first data on a possible correlation between impedances and speech perception. The extent of the impedances as a benchmark for a good performance in speech discrimination tests could not be verified. Further prospective studies, possibly with more precise diagnostic tools, should be carried out to define the value of impedance measurements for cochlear implantation provision.

中文翻译：

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阻抗值与人工耳蜗接受者的言语理解不相关

目的： 

为了评估耳蜗植入后阻抗值和语音感知之间的可能相关性。

学习规划： 

回顾性图表审查。

设置： 

第三转诊中心。

患者和干预措施： 

我们部门中所有植入了MedEl Flex28设备并具有完整听力数据的患者（在65 dB的Freiburger单音节测试，在安静和10 dB噪声下的Hochmaier-Schulz-Moser测试）和1年改装预约中的阻抗测量均已纳入研究。这项研究。进一步的纳入标准是年龄> 17岁，以母语为母语，并且不使用电声刺激。

主要结果指标： 

计算所有电极触点上的阻抗平均值，分别计算基底，内侧和顶端区域的阻抗。这些数据与语音测试结果在统计上相关（皮尔逊相关）。此外，建立了具有极高价值的患者群体，并将其与彼此以及其他群体进行比较。

结果： 

在所有听觉测试中，对于所有电极触点或特定触点群，阻抗值均与语音性能没有显着相关性。在任何情况下，阻抗最低的患者的表现与阻抗最高的患者在统计学上均无差异。

结论： 

据我们所知，这是有关阻抗和语音感知之间可能相关性的第一个数据。阻抗的程度不能作为语音识别测试中良好性能的基准。应该用可能更精确的诊断工具进行进一步的前瞻性研究，以定义用于人工耳蜗植入的阻抗测量值。