Horizontal VOR function shows frequency dynamics in vestibular schwannoma

Blödow, Alexander; Blödow, Julia; Bloching, M.; Helbig, Ralf; Walther, Leif Erik

doi:10.1007/s00405-014-3042-2

Cited by 52 publications

(48 citation statements)

References 26 publications

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“…vHIT is a physiological quick test, does not cause nausea or dizziness, studies the response of each semicircular canal, thus detecting a mono or multicanals pathology, with no need to a darkroom. It has a high specificity reaching 90 % [7,22]. Table 1 shows the sensitivity and specificity of vHIT according to the disease and the degree of caloric test deficit.…”

Section: Discussionmentioning

confidence: 98%

Video head impulse test: a review of the literature

Alhabib

Saliba

2016

Eur Arch Otorhinolaryngol

144

110

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Video head impulse test (vHIT) is a new testing which able to identify the overt and covert saccades and study the gain of vestibulo-ocular reflex (VOR) of each semicircular canal. The aim of this study is to review the clinical use of vHIT in patients with vestibular disorders in different diseases. PubMed and Cochrane databases were searched for all articles that defined vHIT, compared vHIT with another clinical test, and studied the efficacy of vHIT as diagnostic tools with vestibular disease. 37 articles about vHIT were reviewed. All articles studied the vHIT in English and French languages up to May 2015 were included in the review. Editorial articles or short comments, conference abstracts, animal studies, and language restriction were excluded from the review. Four systems were used in the literature to do the vHIT. vHIT is physiological quick test, which studied the VOR at high frequency of each semicircular canal by calculating the duration ratio between the head impulse and gaze deviation. vHIT is more sensitive than clinical head impulse test (cHIT), especially in patient with isolated covert saccades. vHIT test is diagnostic of vestibular weakness by gain reduction and the appearance of overt and covert saccades. If the vHIT is normal, then caloric test is mandatory to rule out a peripheral origin of vertigo. It is recommended to test each semicircular canal, as isolated vertical canal weakness was identified in the literature. More investigation would be required to determine the evolution of the VOR gain with the progression of the vestibular disease.

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Section: Discussionmentioning

confidence: 98%

Video head impulse test: a review of the literature

Alhabib

Saliba

2016

Eur Arch Otorhinolaryngol

144

110

View full text Add to dashboard Cite

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“…One factor is the difference in stimulus frequency of the vHIT and caloric test. The caloric stimulus is a low frequency assessment of vestibular function, while vHIT is a high frequency assessment [McCaslin et al, 2014;Blodow et al, 2015]. A second factor is the extent of physiologic involvement in specific patient populations.…”

Section: Discussionmentioning

confidence: 99%

Effects of Device on Video Head Impulse Test (vHIT) Gain

et al. 2017

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Numerous video head impulse test (vHIT) devices are available commercially; however, gain is not calculated uniformly. An evaluation of these devices/algorithms in healthy controls and patients with vestibular loss is necessary for comparing and synthesizing work that utilizes different devices and gain calculations.Using three commercially available vHIT devices/algorithms, the purpose of the present study was to compare: (1) horizontal canal vHIT gain among devices/algorithms in normal control subjects; (2) the effects of age on vHIT gain for each device/algorithm in normal control subjects; and (3) the clinical performance of horizontal canal vHIT gain between devices/algorithms for differentiating normal versus abnormal vestibular function.Prospective.Sixty-one normal control adult subjects (range 20–78) and eleven adults with unilateral or bilateral vestibular loss (range 32–79).vHIT was administered using three different devices/algorithms, randomized in order, for each subject on the same day: (1) Impulse (Otometrics, Schaumberg, IL; monocular eye recording, right eye only; using area under the curve gain), (2) EyeSeeCam (Interacoustics, Denmark; monocular eye recording, left eye only; using instantaneous gain), and (3) VisualEyes (MicroMedical, Chatham, IL, binocular eye recording; using position gain).There was a significant mean difference in vHIT gain among devices/algorithms for both the normal control and vestibular loss groups. vHIT gain was significantly larger in the ipsilateral direction of the eye used to measure gain; however, in spite of the significant mean differences in vHIT gain among devices/algorithms and the significant directional bias, classification of “normal” versus “abnormal” gain is consistent across all compared devices/algorithms, with the exception of instantaneous gain at 40 msec. There was not an effect of age on vHIT gain up to 78 years regardless of the device/algorithm.These findings support that vHIT gain is significantly different between devices/algorithms, suggesting that care should be taken when making direct comparisons of absolute gain values between devices/algorithms.

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“…30 However, there are inconsistencies with this frequency-dependent model, especially in Ménière's Disease (MD), often characterized by normal vHIT gains and abnormal caloric testing. 31 While varying models have been purposed, this is an area of active research. 30–32 …”

Section: Discussionmentioning

confidence: 99%

Can the Video Head Impulse Test Define Severity of Bilateral Vestibular Hypofunction?

Judge

Janky

Barin

2017

Otology &Amp; Neurotology

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Objective The objective of the study was to compare rotary chair and video head impulse test (vHIT) findings in patients with bilateral vestibular hypofunction (BVH) to determine whether vHIT can: 1) define severity of BVH and 2) accurately predict rotary chair findings in patients with BVH. Study Design Retrospective chart review Setting Research Hospital Patients Twenty subjects with bilateral vestibular hypofunction as assessed by rotary chair. Intervention Rotary chair and vHIT Main Outcome Measures The main outcome measures were rotary chair phase, gain, and symmetry and vHIT vestibulo-ocular reflex (VOR) gain. Rotary chair and vHIT results were assessed and subjects were stratified into groups according to the severity of their vestibular hypofunction. For rotary chair, subjects were classified as Mild, Moderate, or Severe BVH. For vHIT, subjects were classified as normal, unilateral or bilateral. Results Average lateral canal vHIT VOR gain: 1) significantly increased as severity of BVH decreased, and 2) demonstrated a significant and positive, linear relationship with rotary chair gains. vHIT was in disagreement with rotary chair in the classification of 5 subjects, which could be due to right-left asymmetry of BVH. Conclusion vHIT can serve as an initial tool for identifying patients with BVH. Lower vHIT gains are consistent with having Severe BVH. There was disagreement between vHIT and rotary chair, though not for any patients with Severe BVH. Compared to rotary chair, the clinical gold standard for identifying BVH, vHIT possesses 100% sensitivity for identifying Severe BVH when average vHIT gains are < 0.46.

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Horizontal VOR function shows frequency dynamics in vestibular schwannoma

Cited by 52 publications

References 26 publications

Video head impulse test: a review of the literature

Video head impulse test: a review of the literature

Effects of Device on Video Head Impulse Test (vHIT) Gain

Can the Video Head Impulse Test Define Severity of Bilateral Vestibular Hypofunction?

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