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Changes of video head impulse test results in lateral semicircular canal plane by different peak head velocities in patients with vestibular neuritis |
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| Authors: | Tae Su Kim Hyun Woo Lim Chan Joo Yang Yong Han Kim Woo Ri Choi Yeh Ree Kim |
| Affiliation: | 1. Department of Otolaryngology, Kangwon National University, Chuncheon, Republic of Korea;2. Department of Otolaryngology, Asan Medical Center, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Republic of Korea;3. Department of Otorhinolaryngology-Head and Neck Surgery, Hanil General Hospital, Seoul, Republic of Korea;4. Department of Otolaryngology-Head and Neck Surgery, Asan Medical Center, University of Ulsan, Seoul, Republic of Korea |
| 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. |
| Keywords: | Vestibular neuritis video head impulse test saccade overt covert gain diagnosis |