Molisz Andrzej, Zarowski Andrzej, Vermeiren Annelies, Theunen Tinne, De Coninck Liesbeth, Siebert Janusz, Offeciers Erwin F
Department of Family Medicine, Medical University of Gdansk, Gdansk, Poland.
Audiol Neurootol. 2015;20(4):222-8. doi: 10.1159/000377615. Epub 2015 May 9.
To evaluate the postoperative changes of the basic electrophysiological and psychophysical parameters in cochlear implant (CI) patients: the impedance of the electrode contacts, the electrically-evoked compound action potential (ECAP) thresholds and the T/C levels.
Retrospective case review in a quaternary otologic referral centre.
Data on the impedance of the electrode contacts, the ECAP thresholds and the T/C levels were collected in 20 consecutive CI patients divided into 2 groups. Group 1 comprised 10 prelingually deaf children implanted before the age of 18 months, and group 2 comprised 10 postlingually deaf adults (average age of 58 years). All patients were users of the Nucleus 24RECA (Freedom, Contour advance off-stylet electrode) CI.
(1) The mid-portion and the apical electrodes showed a decrease in the impedance values between the 1st and the 6th postoperative months and stabilization in the later course. Impedance of the most basal electrodes grew during the first postoperative months and stabilized later on, but remained higher than the impedance of the mid-portion and the apical electrodes. (2) The neural response telemetry threshold values tended to decrease within the first 3 months after surgery to reach a plateau afterwards. (3) The behavioural threshold levels remained generally stable, except for the basal electrodes where a decrease could be observed. The hearing comfort levels showed an increase during the first 6 months of the implant use and remained stable afterwards.
评估人工耳蜗（CI）植入患者术后基本电生理和心理物理学参数的变化：电极触点阻抗、电诱发复合动作电位（ECAP）阈值和T/C水平。
在一家四级耳科转诊中心进行回顾性病例分析。
收集20例连续CI植入患者的电极触点阻抗、ECAP阈值和T/C水平数据，将患者分为2组。第1组包括10名18个月前植入的语前聋儿童，第2组包括10名语后聋成人（平均年龄58岁）。所有患者均使用Nucleus 24RECA（Freedom，Contour advance off-stylet电极）人工耳蜗。
（1）术后第1个月至第6个月，中部和顶部电极的阻抗值下降，随后趋于稳定。最底部电极的阻抗在术后最初几个月增加，随后稳定，但仍高于中部和顶部电极的阻抗。（2）神经反应遥测阈值在术后前3个月内趋于下降，随后达到平台期。（3）行为阈值水平总体保持稳定，但底部电极处可观察到下降。听觉舒适度在植入使用的前6个月有所增加，之后保持稳定。
