Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2017 Feb 16;16(1):124-128.
doi: 10.5114/aoms.2017.66048. eCollection 2020.

Comparison of two VHIT software programs in diagnostics of semicircular canals

Piotr Pietkiewicz  1 , Jaroslaw Milonski  1 , Marzena Bielinska  1 , Jurek Olszewski  1
Affiliations

Comparison of two VHIT software programs in diagnostics of semicircular canals

Piotr Pietkiewicz et al. Arch Med Sci. .

Abstract

Introduction: The aim of this work was to assess SCC function in VHIT test, using both versions of VHIT ULMER.

Material and methods: The study was performed in 57 subjects aged 22-33 years (48 women and 9 men) without vertigo in anamnesis. Patients did not complain of any "vertigo" ailments or any balance disorder incidents in the past. All tests using either VHIT I or VHIT II were performed by the same person. The function of lateral SCC in VHIT ULMER II was examined similarly like in VHIT ULMER I. In both methods was used the same sensitivity threshold parameters for horizontal and vertical accelerations (horizontal - 2500, vertical - 1600). Each of these sequences enables a parameter, called represented GAIN, to be calculated in form of a point on the canalogram.

Results: GAIN represents the deviation of the gaze in comparison to the deviation of the head between the first (t - 0 ms) and the fourth image (t = 120 ms). The calculation formula is: GAIN (in %) =100 x DG/RH. DG is deviation of the gaze ("gaze velocity in space") and RH is rotation of the head ("head velocity or impulse canal paresis"). Normal GAIN value ranges 1-40%.

Conclusions: The examination using VHIT ULMER II appears to be a more sensitive diagnostic method than VHIT ULMER I. Improved software with automated functions such as camera adjustments, examination surface arrangement, of VHIT ULMER II, enables technician to shorten the time of examination, simultaneously providing a range of new information about the condition of oculo-vestibular system.

Keywords: semicircular canal diagnostics; two VHIT software programs.

PubMed Disclaimer

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Range of head movements for testing the horizontal semicircular canals
Figure 2
Figure 2
Range of head movements for testing the vertical semicircular canals
Figure 3
Figure 3
The mean value amplification/GAIN for VHIT ULMER I in women and men
Figure 4
Figure 4
The mean value amplification/GAIN for VHIT ULMER I in women
Figure 5
Figure 5
The mean value amplification/GAIN for VHIT ULMER I in men
Figure 6
Figure 6
The mean value amplification/GAIN for VHIT ULMER II in women and men
Figure 7
Figure 7
The mean value amplification/GAIN for VHIT ULMER II in women
Figure 8
Figure 8
The mean value amplification/GAIN for VHIT ULMER II in men
See this image and copyright information in PMC

References

    1. Zingler VC, Cnyrim C, Jahn K, et al. Causative factors and epidemiology of bilateral vestibulopathy in 255 patients. Ann Neurol. 2007;61:524–32. - PubMed
    1. McGarvie LA, Halmagyi M, Curthoys I, MacDougall H. Video head impulse testing – age dependent normative values in healthy subjects. J Vestib Res. 2014;24:77.
    1. Macdougall HG, McGarvie LA, Halmagyi GM, Curthoys IS, Weber KP. The video Head Impulse Test (vHIT) detects vertical semicircular canal dysfunction. PLoS One. 2013;8:1488–98. - PMC - PubMed
    1. Curthoys IS. The interpretation of clinical tests of peripheral vestibular function. Laryngoscope. 2012;122:1342–52. - PubMed
    1. Eza-Nuñez P, Fariñas-Alvarez C, Perez-Fernandez N. The caloric test and the Video Head-Impulse Test in patients with vertigo. Int Adv Otol. 2014;10:144–9.