School of Psychology, University of Sydney, Sydney, Australia.
Institute of Academic Surgery, Royal Prince Alfred Hospital, Sydney, Australia.
Acta Otolaryngol. 2021 May;141(5):471-475. doi: 10.1080/00016489.2021.1884287. Epub 2021 Feb 27.
Superior Canal Dehiscence is classically diagnosed with typical abnormalities on Vestibular Evoked Myogenic Potentials (VEMPs) and Computed Tomography (CT) scans.
This paper discusses the utility of the video Head Impulse Test (vHIT) in SCD.
Data from 11 ears (8 patients) with SCD were retrospectively reviewed. Results from vHIT, VEMPs and CT and when possible, MRI scans were correlated. An audit of 300 vHIT from patients undergoing routine testing for any neurotological complaint was also conducted to look at the incidence of isolated abnormal superior canal function.
82% of patients (9 ears) with SCD showed abnormal vHIT (reduced gain and catch-up saccades) isolated to the affected superior semicircular canal.
Correlation of the CT and VEMPs are important in forming a diagnosis of SCD. However, if isolated superior canal vHIT abnormalities are demonstrated, it is suggestive of SCD and such patients should be referred for further investigations.
上半规管裂通常通过前庭诱发肌源性电位（VEMPs）和计算机断层扫描（CT）检查的典型异常来诊断。
本文讨论视频头脉冲试验（vHIT）在上半规管裂中的应用。
回顾性分析 8 例（11 耳）上半规管裂患者的数据。对 vHIT、VEMPs 和 CT 的结果进行了相关性分析，当可能时，还对 MRI 扫描结果进行了相关性分析。对 300 例因任何神经耳科主诉而接受常规检查的患者进行 vHIT 检测，以观察孤立性上半规管功能异常的发生率。
82%（9 耳）的上半规管裂患者（SCD）的 vHIT 异常（增益降低和追赶性扫视）局限于受累的上半规管。
CT 和 VEMPs 的相关性对 SCD 的诊断很重要。然而，如果仅出现上半规管 vHIT 异常，提示 SCD 的可能性，应建议此类患者进一步检查。
