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

Kim, Tae Su; Lim, Hyun Woo; Yang, Chan Joo; Kim, Yong Han; Choi, Wonbong; Kim, Yeh Ree; Park, Jun Woo; Kang, Byung Chul; Park, Hong Ju

doi:10.1080/00016489.2018.1481523

Cited by 19 publications

(13 citation statements)

References 19 publications

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“…Therefore, it is very unlikely that differences in peak head velocity between Synapsys and the other VHIT systems might have caused most of the VOR gain differences between VHIT systems in this study. The statistically significant difference in median peak head velocities between VHIT trials of Interacoustics and Otometrics was only small (11°/s difference), and, therefore, probably not influenced the (not significant) VOR gain differences between the two systems [19]. Regarding the order effect and the frequency and latency of covert saccades, VOR gains and covert saccades did not show differences in this BV population with repetitive testing.…”

Section: Discussionmentioning

confidence: 69%

“…In the other seven patients, no statistically significant difference in peak head velocities between VHIT systems was found, or the system with significantly higher (or lower) peak head velocities also measured higher (or lower, respectively) VOR gains in that patient [19].…”

Section: Peak Head Velocitymentioning

confidence: 74%

“…When observing differences in VOR gains between different VHIT systems and VHIT trials, it is very important to first rule out measurement artefacts, like clinically relevant differences in peak head velocities, the order effect, and differences in frequency and latency of covert saccades that could influence the VOR gain calculations [5,16,21]. Regarding differences in peak head velocities, a higher peak head velocity might result in lower VOR [19]. However, in contrast to these findings, the system with significantly lower median peak head velocities during VHIT trials (Synapsys), also showed the lowest VOR gains in this study.…”

Section: Discussionmentioning

confidence: 99%

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Comparison of three video head impulse test systems for the diagnosis of bilateral vestibulopathy

et al. 2020

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Introduction A horizontal vestibulo-ocular reflex gain (VOR gain) of < 0.6, measured by the video head impulse test (VHIT), is one of the diagnostic criteria for bilateral vestibulopathy (BV) according to the Báràny Society. Several VHIT systems are commercially available, each with different techniques of tracking head and eye movements and different methods of gain calculation. This study compared three different VHIT systems in patients diagnosed with BV. Methods This study comprised 46 BV patients (diagnosed according to the Báràny criteria), tested with three commercial VHIT systems (Interacoustics, Otometrics and Synapsys) in random order. Main outcome parameter was VOR gain as calculated by the system, and the agreement on BV diagnosis (VOR gain < 0.6) between the VHIT systems. Peak head velocities, the order effect and covert saccades were analysed separately, to determine whether these parameters could have influenced differences in outcome between VHIT systems. Results VOR gain in the Synapsys system differed significantly from VOR gain in the other two systems [F(1.256, 33.916) = 35.681, p < 0.000]. The VHIT systems agreed in 83% of the patients on the BV diagnosis. Peak head velocities, the order effect and covert saccades were not likely to have influenced the above mentioned results. Conclusion To conclude, using different VHIT systems in the same BV patient can lead to clinically significant differences in VOR gain, when using a cutoff value of 0.6. This might hinder proper diagnosis of BV patients. It would, therefore, be preferred that VHIT systems are standardised regarding eye and head tracking methods, and VOR gain calculation algorithms. Until then, it is advised to not only take the VOR gain in consideration when assessing a VHIT trial, but also look at the raw traces and the compensatory saccades.

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Section: Discussionmentioning

confidence: 69%

Section: Peak Head Velocitymentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

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Comparison of three video head impulse test systems for the diagnosis of bilateral vestibulopathy

et al. 2020

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“…Finally, if the head impulses are performed too quickly, e.g., faster than 250° per second, it may influence the examination by causing a lot of noise, leading to high gain values [23].…”

Section: Resultsmentioning

confidence: 99%

Normative Vestibular-Ocular Reflex Gain Values for the Vertical Semicircular Canals

2020

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Objectives: To determine normative vestibular-ocular-reflex (VOR) gain values for the vertical semicircular canals (SCCs) within a Danish cohort of healthy adults. Normative data regarding the vertical SCCs are sparse. Assessing the function of all 6 SCCs is important, as some vestibular diseases may selectively affect specific SCCs. Methods: A prospective cross-sectional study of 60 subjects aged 18-65 years with no previous vestibular disorders. All subjects underwent complete examination of all 6 SCCs with EyeSeeCam video head impulse test (vHIT) system. Results: Mean VOR gain values of the right anterior and left posterior canal were 1.46 and 1.43 respectively. For the left anterior and right posterior canals, mean VOR gain values were 0.96 and 0.97 respectively. Conclusions: Our results suggest that mean VOR gain is close to 1.4 in the right anterior and left posterior plane and close to one for the left anterior and right posterior plane when testing the vertical SCCs in healthy adults with the EyeSeeCam vHIT system.

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“…In patients with AUV, the frequency of corrective saccades was also lower with low-velocity head impulse tests (80 degree/s) compared with high-velocity head impulses (240 degree/s). 28 VOR deficits, both from bedside head impulse tests and quantitative measures, have also been demonstrated in central lesions, although these are typically mild unilateral deficits or mild bilateral reductions. 3,21,29 Stroke in the distribution of the AICA is the closest mimicker of vestibular neuritis as it is the vascular supply to the peripheral auditory and vestibular structures.…”

Section: Brainstem or Cerebellar Ischemia/infarctionmentioning

confidence: 99%

Acute Vestibular Syndrome

Kerber

2020

Semin Neurol

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The acute vestibular syndrome (AVS) is a label for presentations of new-onset severe dizziness, vertigo, or imbalance, with examination findings of nystagmus or gait unsteadiness. The prototypical AVS presentation is the acute unilateral vestibulopathy due to vestibular neuritis. Stroke is also a serious concern in patients with AVS. Most other peripheral vestibular disorders present as episodic or chronic syndromes. In this article, the diagnostic considerations, exam findings, and management of AVS are reviewed.

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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

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

Cited by 19 publications

References 19 publications

Comparison of three video head impulse test systems for the diagnosis of bilateral vestibulopathy

Comparison of three video head impulse test systems for the diagnosis of bilateral vestibulopathy

Normative Vestibular-Ocular Reflex Gain Values for the Vertical Semicircular Canals

Acute Vestibular Syndrome

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