Department of Otorhinolaryngology - Head and Neck Surgery, Shinshu University School of Medicine, Matsumoto, Japan.
Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan.
Acta Otolaryngol. 2023 Sep;143(9):748-752. doi: 10.1080/00016489.2023.2256790. Epub 2023 Nov 8.
To achieve better speech performance following cochlear implantation (CI), measuring the patient's cochlear duct length (CDL) and determining the appropriate length of the CI array are important.
To investigate the CDL in CI patients after using the OTOPLAN software preoperatively and compare the results of angular insertion depth (AID) estimation by OTOPLAN and postoperative radiography.
The study included 105 Japanese CI patients with normal cochleae. We measured the CDL using OTOPLAN and the position of the tip channel of the electrode for each selected electrode array, and estimated the AID using the software.
The mean CDL was 35.1 ± 1.6 mm. Preoperatively, the mean estimated AID was 580.3 ± 57.8°. Postoperative radiography revealed a mean AID of 583.0 ± 56.7°, demonstrating a strong linear correlation between the two measurements ( = 0.635).
Our findings revealed that CDL varies widely, which is consistent with previous studies. To achieve better speech perception, surgeons should select the appropriate length of CI electrode array based on the individual's CDL. Preoperative measurement of each CDL by OTOPLAN, which is clinically feasible and comparable to postoperative evaluation, can be used to ensure selection of the appropriate electrode array length.
为了在人工耳蜗植入（CI）后获得更好的言语表现，测量患者的耳蜗管长度（CDL）并确定 CI 数组的适当长度非常重要。
使用 OTOPLAN 软件术前测量 CI 患者的 CDL，并比较 OTOPLAN 估计的角插入深度（AID）与术后放射照相的结果。
本研究纳入了 105 例日本正常耳蜗的 CI 患者。我们使用 OTOPLAN 测量 CDL，并为每个选定的电极数组测量电极尖端通道的位置，并使用软件估计 AID。
平均 CDL 为 35.1±1.6mm。术前，平均估计的 AID 为 580.3±57.8°。术后放射照相显示平均 AID 为 583.0±56.7°，两者之间存在很强的线性相关性（ = 0.635）。
我们的研究结果表明 CDL 变化范围较大，与以往研究一致。为了获得更好的言语感知，外科医生应根据个体的 CDL 选择适当长度的 CI 电极数组。通过 OTOPLAN 对每个 CDL 进行术前测量，这在临床上是可行的，并且可以与术后评估相媲美，有助于确保选择合适的电极数组长度。
