Comparison of two VHIT software programs in diagnostics of semicircular canals

Abstract

A b s t r a c tIntroduction: 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.

The Relationship between Meniere’s Disease and Acute Low-Tone Sensorineural Hearing Loss

“…vHIT uses high-frequency and natural passive head-turning stimuli to objectively record head and eye movements (3 pairs of semicircular canal VOR gain values and corresponding 3 gain asymmetry values) and to test 6 semicircular canal high-frequency dynamic functions (2–5 Hz) and horizontal semicircular tube function and the vertical semicircular tube function. The vHIT has been shown to improve the detection rate in patients with peripheral vertigo and is useful for the identification of peripheral vertigo [ 16 , 17 ]. Vestibular-evoked myogenic potential (VEMP) testing [ 18 ] is a noninvasive and simple technique for detecting otolithic vestibular function by evoked potentials generated after the stimulation of the otolithic apparatus by bone-conducted vibration or air-conducted sound.…”

“…e heat test is a hydrodynamic response in which cold or hot water or air is instilled into the external auditory canal and the temperature of the water or air is conducted through the tympanic membrane to the inner ear, causing thermal expansion and contraction of the endolymph [13]. It can [16,17]. Vestibularevoked myogenic potential (VEMP) testing [18] is a noninvasive and simple technique for detecting otolithic vestibular function by evoked potentials generated after the stimulation of the otolithic apparatus by bone-conducted vibration or air-conducted sound.…”