Changes of video head impulse test results in lateral semicircular canal plane by different peak head velocities in patients with vestibular neuritis

Abstract

Background: The peak head velocity influences on the video head impulse test (vHIT) results, but it has been not known how much the difference is.

Aims: To evaluate the clinical evidence for the superiority of high-velocity compared to low-velocity vHIT.

Material and methods: vHIT was performed in 30 patients with vestibular neuritis using two peak head velocities (mean 80 vs. 240°/s). vHIT gains and parameters of corrective saccades (CSs) were compared. A vHIT gain of ≤0.8 or a peak CS velocity of ≥100°/s was considered pathologic.

Results: The vHIT gains were significantly lower (mean 0.5 vs. 0.6), and GA was larger (35 vs. 25%) at high-velocity vHIT, compared to low-velocity vHIT. CSs were significantly more frequent (100 vs. 80%) and peak CS velocities were larger (252 vs. 112°/s) at high-velocity vHIT. The abnormal rates based on vHIT gains were higher (90% vs. 73%) and CSs occurred more frequently (100% vs. 80%) at high-velocity vHIT. The abnormal rates based on the peak CS velocity were significantly higher at high-velocity vHIT (100% vs. 57%).

Conclusion: High-velocity vHIT is superior to low-velocity vHIT with a difference of 17–20% based on pathologic vHIT gains and presence of CSs.

Chinese abstract

背景：峰值磁头速度对视频磁头脉冲测试（vHIT）结果有影响, 但差异到底有多大还是未知数。

目的：评估相较于低速vHIT, 高速vHIT的优越性的临床证据。

材料和方法：使用两个峰值磁头速度（平均值80°/ s相对于240°/ s）对30名前庭神经炎患者进行vHIT检测。比较vHIT增益和修正扫视参数（CS）。 vHIT增益≤0.8或峰值CS速度≥100°/ s被认为是病理性的。

结果：与低速vHIT相比, 在高速vHIT时, vHIT增益明显较低（平均值为0.5对0.6）, GA较大（35%对25％）。在高速vHIT时, CS更频繁（100% 对80％）, 峰值CS速度更大（252°/ s对112°/ s）。基于vHIT增益, 异常率在高速vHIT时较高（90％对73％）, 而CS更频繁（100％对80％）。基于峰值CS速度, 异常率在高速度vHIT时显著更高（100％对57％）。

结论：基于病理性vHIT获益和CSs的存在, 高速vHIT优于低速vHIT, 差异为17-20％。

Keywords:

• Vestibular neuritis
• video head impulse test
• saccade
• overt
• covert
• gain
• diagnosis

Disclosure statement

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article.