Department of Otolaryngology - Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota.
Department of Otolaryngology - Head and Neck Surgery, West Virginia University, Morgantown, West Virginia.
Otol Neurotol. 2020 Jul;41(6):e680-e685. doi: 10.1097/MAO.0000000000002625.
Determine if changes in middle ear absorbance measured with wide-band tympanometry (WBT) occur following hearing-preservation cochlear implantation (CI). Such measures may provide insight into the mechanisms of acoustic hearing loss postimplantation.
Clinical capsule report.
Tertiary academic referral center.
WBT absorbance was measured bilaterally during pre- and postoperative clinical office visits in five unilaterally-implanted cochlear implant recipients. Pre- and postoperative WBT measures were compared within each subject in the implanted and contralateral, unimplanted ears.
In general, WBT absorbance measurements show a broad spectral pattern including two or three distinct peaks measured over a frequency range of 226 to 8000 Hz. Grand average and linear mixed model comparisons between the pre- and postoperative WBT patterns show significantly reduced (p < 0.05) low-frequency absorbance in the implanted ears in the frequency region over 0.6 to 1.1 kHz, but not in the unimplanted ears. The maximum effect occurred at 1 kHz with absorbance decreasing from ∼0.8 to ∼0.5 after implantation. The limited data are consistent with expected relationships between WBT absorbance and air- and bone-conduction thresholds, assuming an increased air-bone gap reflects conductive hearing loss.
Cochlear implantation can result in reduction of low-frequency acoustic absorbance as measured by WBT. WBT may be a useful and sensitive tool for monitoring the mechanical status of the middle and inner ears following cochlear implantation.
确定宽频带鼓室声导抗（WBT）测量的中耳吸收率在听力保护耳蜗植入（CI）后是否发生变化。这些措施可能为植入后声学听力损失的机制提供深入了解。
临床胶囊报告。
三级学术转诊中心。
在五名单侧植入人工耳蜗植入受者的术前和术后临床门诊期间，双侧测量 WBT 吸收率。在植入和对侧未植入耳朵中，在每个受试者内比较术前和术后 WBT 测量值。
通常，WBT 吸收率测量值显示出广泛的光谱模式，包括在 226 至 8000 Hz 的频率范围内测量的两个或三个明显的峰值。在植入耳朵中，WBT 模式的总体平均值和线性混合模型比较显示，在 0.6 至 1.1 kHz 以上的频率区域中，低频吸收率显著降低（p<0.05），而在未植入耳朵中则没有。最大效应发生在 1 kHz，植入后吸收率从约 0.8 降至约 0.5。有限的数据与 WBT 吸收率与空气和骨导阈值之间的预期关系一致，假设空气骨间隙增加反映传导性听力损失。
耳蜗植入可导致 WBT 测量的低频声吸收率降低。WBT 可能是监测耳蜗植入后中耳和内耳机械状态的有用且敏感的工具。
