Abstract：
BACKGROUND: The maximum comfort level (MCL), threshold level (THR) and electrical impedance change in the postoperative period of the cochlear implant for months until they stabilize. The objective of this article is to establish the variation during 5 post-surgical years of impedance, and its relationship with MCL in unilaterally implanted adults.
METHODS: Retrospective study over 5 years, with 78 adult patients implanted with MED-EL in a tertiary hospital from the year 2000 to 2015. The variation in impedance, MCL and the relationship between them were analyzed in basal (9-12), medial (5-8) and apical electrodes (1-4), performing an inferential ANOVA analysis of repeated measures with comparisons between consecutive times, corrected with Bonferroni criteria.
RESULTS: 33 men (42.3%) and 45 women (57.7%), with a mean age of 52.7±14.6 years. \"Stability\" was considered the time of follow-up without statistically significant differences between one visit and the next. Changes in impedance in medial electrodes ceased to be statistically significant at 3 months, and in apicals at 6 months, with mean values of 5.84 and 6.43kΩ. MCL stabilized at 2 years in basal and apical electrodes, and at 3 years in medial, with mean values of 24.9, 22.7, and 25.6qu. There was a correlation between MCL and impedance in medium electrodes up to 3 months and in apical ones up to one year.
CONCLUSIONS: Electrical impedance drops significantly in medial and apical electrodes up to 3 and 6 months. MCL increases significantly up to two years. Impedance is related to MCL up to 6 months.
METHODS: Retrospective study over 5 years, with 78 adult patients implanted with MED-EL in a tertiary hospital from the year 2000 to 2015. The variation in impedance, MCL and the relationship between them were analyzed in basal (9-12), medial (5-8) and apical electrodes (1-4), performing an inferential ANOVA analysis of repeated measures with comparisons between consecutive times, corrected with Bonferroni criteria.
RESULTS: 33 men (42.3%) and 45 women (57.7%), with a mean age of 52.7±14.6 years. \"Stability\" was considered the time of follow-up without statistically significant differences between one visit and the next. Changes in impedance in medial electrodes ceased to be statistically significant at 3 months, and in apicals at 6 months, with mean values of 5.84 and 6.43kΩ. MCL stabilized at 2 years in basal and apical electrodes, and at 3 years in medial, with mean values of 24.9, 22.7, and 25.6qu. There was a correlation between MCL and impedance in medium electrodes up to 3 months and in apical ones up to one year.
CONCLUSIONS: Electrical impedance drops significantly in medial and apical electrodes up to 3 and 6 months. MCL increases significantly up to two years. Impedance is related to MCL up to 6 months.
摘要：
背景：最大舒适度（MCL），阈值水平（THR）和电阻抗在耳蜗植入术后数月变化，直到它们稳定。本文的目的是建立在5个术后年的阻抗变化，及其与单侧植入成人MCL的关系。
方法：超过5年的回顾性研究，从2000年到2015年，78名成人患者在三级医院植入了MED-EL。阻抗的变化，在基础（9-12）中分析MCL及其之间的关系，内侧（5-8）和心尖电极（1-4），用连续时间之间的比较对重复测量进行推理方差分析，用Bonferroni标准校正。
结果:33名男性(42.3%)和45名女性(57.7%),平均年龄52.7±14.6岁。“稳定性”被认为是随访时间，一次访视与下一次访视之间无统计学差异。中间电极阻抗的变化在3个月时不再具有统计学意义，在六个月的顶点，平均值为5.84和6.43kΩ。MCL在基底和根尖电极中稳定在2年，在3年的中间，平均值分别为24.9、22.7和25.6。在长达3个月的中等电极和长达1年的顶部电极中，MCL与阻抗之间存在相关性。
结论：在3个月和6个月内，内侧和心尖电极的电阻抗显著下降。MCL显著增加长达两年。阻抗与MCL相关长达6个月。
方法：超过5年的回顾性研究，从2000年到2015年，78名成人患者在三级医院植入了MED-EL。阻抗的变化，在基础（9-12）中分析MCL及其之间的关系，内侧（5-8）和心尖电极（1-4），用连续时间之间的比较对重复测量进行推理方差分析，用Bonferroni标准校正。
结果:33名男性(42.3%)和45名女性(57.7%),平均年龄52.7±14.6岁。“稳定性”被认为是随访时间，一次访视与下一次访视之间无统计学差异。中间电极阻抗的变化在3个月时不再具有统计学意义，在六个月的顶点，平均值为5.84和6.43kΩ。MCL在基底和根尖电极中稳定在2年，在3年的中间，平均值分别为24.9、22.7和25.6。在长达3个月的中等电极和长达1年的顶部电极中，MCL与阻抗之间存在相关性。
结论：在3个月和6个月内，内侧和心尖电极的电阻抗显著下降。MCL显著增加长达两年。阻抗与MCL相关长达6个月。
