Department of Otorhinolaryngology, Kırıkkale Yüksek İhtisas Hospital, Kırıkkale, Turkey.
Department of Radiology, Faculty of Medicine, Hacettepe University, Ankara, Turkey.
J Laryngol Otol. 2021 Jun;135(6):501-507. doi: 10.1017/S0022215121000979. Epub 2021 Apr 12.
To determine the effect of cochlear dimensions on cochlear implant selection in cochlear hypoplasia patients.
Temporal bone computed tomography images of 36 patients diagnosed with cochlear hypoplasia between 2010 and 2016 were retrospectively reviewed and compared with those of 40 controls without sensorineural hearing loss.
Basal turn length and mid-modiolar height were significantly lower in the cochlear hypoplasia patients with subtypes I, II and III than in the control group (p < 0.001). Mid-scalar length was significantly shorter in subtype I-III patients as compared with the control group (p < 0.001). In addition, cochlear canal length (measured along the lateral wall) was significantly shorter in subtype I-IV patients than in the control group (subtypes I-III, p < 0.001; subtype IV, p = 0.002).
Cochlear hypoplasia should be considered if basal turn length is less than 7.5 mm and mid-modiolar height is less than 3.42 mm. The cochlear implant should be selected according to cochlear hypoplasia subgroup. It is critically important to differentiate subtype II from incomplete partition type I and subtype III from a normal cochlea, to ensure the most appropriate implant electrode selection so as to optimise cochlear implantation outcomes.
确定耳蜗尺寸对耳蜗发育不全患者人工耳蜗选择的影响。
回顾性分析 2010 年至 2016 年间诊断为耳蜗发育不全的 36 例患者的颞骨 CT 图像，并与 40 例无感觉神经性听力损失的对照组进行比较。
耳蜗发育不全 I、II 和 III 型患者的基底回长度和中耳蜗高度明显低于对照组（p<0.001）。I-III 型患者的中耳蜗长度明显短于对照组（p<0.001）。此外，I-IV 型患者的耳蜗管长度（沿外侧壁测量）明显短于对照组（I-III 型，p<0.001；IV 型，p=0.002）。
如果基底回长度小于 7.5mm，中耳蜗高度小于 3.42mm，应考虑耳蜗发育不全。应根据耳蜗发育不全亚组选择人工耳蜗。区分 II 型与不完全分隔 I 型，以及 III 型与正常耳蜗至关重要，以确保最合适的植入电极选择，从而优化耳蜗植入效果。
