scholarly journals The Role of Predictability in Saccadic Eye Responses in the Suppression Head Impulse Test of Horizontal Semicircular Canal Function

2017 ◽  
Vol 8 ◽  
Author(s):  
Jorge Rey-Martinez ◽  
Joaquin Yanes ◽  
Jonathan Esteban ◽  
Ricardo Sanz ◽  
Eduardo Martin-Sanz
Keyword(s):  
Semicircular Canal ◽  
Head Impulse Test ◽  
Horizontal Semicircular Canal ◽  
Head Impulse

Video Head Impulse Testing (vHIT) and the Assessment of Horizontal Semicircular Canal Function

2015 ◽  
Vol 26 (05) ◽  
pp. 518-523 ◽  
Author(s):  
Kristal M. Riska ◽  
Owen Murnane ◽  
Faith W. Akin ◽  
Courtney Hall
Keyword(s):  
Semicircular Canal ◽  
Objective Assessment ◽  
Vestibular Function ◽  
Vestibular Evoked Myogenic Potentials ◽  
Head Impulse Test ◽  
Clinical Test ◽  
Horizontal Semicircular Canal ◽  
Head Impulse ◽  
New Instrument ◽  
Qualitative Test

Background: Vestibular function (specifically, horizontal semicircular canal function) can be assessed across a broad frequency range using several different techniques. The head impulse test is a qualitative test of horizontal semicircular canal function that can be completed at bedside. Recently, a new instrument (video head impulse test [vHIT]) has been developed to provide an objective assessment to the clinical test. Questions persist regarding how this test may be used in the overall vestibular test battery. Purpose: The purpose of this case report is to describe vestibular test results (vHIT, rotational testing, vestibular evoked myogenic potentials, and balance and gait performance) in an individual with a 100% unilateral caloric weakness who was asymptomatic for dizziness, vertigo or imbalance. Data Collection and/or Analysis: Comprehensive assessment was completed to evaluate vestibular function. Caloric irrigations, rotary chair testing, vHIT, and vestibular evoked myogenic potentials were completed. Results: A 100% left-sided unilateral caloric weakness was observed in an asymptomatic individual. vHIT produced normal gain with covert saccades. Conclusions: This case demonstrates the clinical usefulness of vHIT as a diagnostic tool and indicator of vestibular compensation and functional status.

scholarly journals Clinical Implication of Corrective Saccades in the Video Head Impulse Test for the Diagnosis of Posterior Inferior Cerebellar Artery Infarction

2021 ◽  
Vol 12 ◽  
Author(s):  
Gi-Sung Nam ◽  
Hyun-June Shin ◽  
Jin-Ju Kang ◽  
Na-Ri Lee ◽  
Sun-Young Oh
Keyword(s):  
Semicircular Canal ◽  
Posterior Inferior Cerebellar Artery ◽  
Mean Amplitude ◽  
Head Impulse Test ◽  
Stroke Patients ◽  
Horizontal Semicircular Canal ◽  
Head Impulse ◽  
Cerebellar Artery ◽  
Corrective Saccades ◽  
The Mean

Objective: In the present study, we characterized the vestibulo-ocular reflex (VOR) gain and properties of corrective saccades (CS) in patients with posterior inferior cerebellar artery (PICA) stroke and determined the best parameter to differentiate PICA stroke from benign peripheral vestibular neuritis (VN). In particular, we studied CS amplitude and asymmetry in video head impulse tests (vHITs) to discriminate these two less-studied disease conditions.Methods: The vHITs were performed within 1 week from symptom onset in patients with PICA stroke (n = 17), patients with VN (n = 17), and healthy subjects (HS, n = 17).Results: PICA stroke patients had bilaterally reduced VOR gains in the horizontal semicircular canal (HC) and the posterior semicircular canal (PC) compared with HSs. When compared with VN patients, PICA stroke patients showed preserved gains in the HC and anterior semicircular canal (AC) bilaterally (i.e., symmetric VOR gain). Similar to VOR gain, smaller but bilaterally symmetric CS in the HC and AC were observed in PICA stroke patients compared with VN patients; the mean amplitude of CS for the ipsilesional HC was reduced (p < 0.001, Mann–Whitney U-test), but the mean amplitude of CS for the contralesional HC was increased (p < 0.03, Mann–Whitney U-test) in PICA stroke compared with VN. The receiver operating characteristic (ROC) curve showed that CS amplitude asymmetry (CSs) and VOR gain asymmetry (Gs) of HC are excellent parameters to distinguish PICA stroke from VN.Conclusion: In the current study, we quantitatively investigated the VOR gain and CS using vHITs for three semicircular canals in PICA stroke and VN patients. In addition to VOR gain, quantitative assessments of CS using vHITs can provide sensitive and objective parameters to distinguish between peripheral and central vestibulopathies.

scholarly journals Head Impulse Test

2012 ◽  
Vol 4 (2) ◽  
pp. 106-111 ◽  
Keyword(s):  
Semicircular Canal ◽  
Prognostic Significance ◽  
The Other ◽  
Reliable Indicator ◽  
Head Impulse Test ◽  
Caloric Test ◽  
Horizontal Semicircular Canal ◽  
Head Impulse ◽  
Vestibular Deficit ◽  
Simple Bedside

ABSTRACT In 1988, Michael Halmagyi and Ian Curthuoys described a simple yet reliable indicator of unilateral peripheral vestibular deficits at the bedside. This ‘head impulse test’ (HIT) as is has been known since, has stood the test of being a reliable indicator of vestibular deficit, especially for the horizontal semicircular canal. The test has been described using various techniques, such as the scleral search coil, the video HIT, etc. but even a simple bedside clinical evaluation with a little amount of experience usually sufficed to detect overt vestibular deficits. Numerous studies have compared the efficacy of the HIT as compared with other tests of vestibular deficit, the caloric test (CT) being the most commonly compared one. A look at the physiology behind the two tests reveals the differing pathways tested by the two tests in mention, and hence it would be wise to say that the two are complimentary, rather than exclusive of the other. The HIT today forms a vital part of the armamentarium of the otologist to arrive at rapid understanding of the nature of the vestibular deficit, the laterality of the lesion, and the probable prognostic significance. How to cite this article Khattar VS, Hathiram BT. Head Impulse Test. Otorhinolaryngol Clin Int J 2012;4(2):106-111.

Vestibular semicircular canal function as detected by video Head Impulse Test (vHIT) is essentially unchanged in people with Parkinson’s disease compared to healthy controls

2021 ◽  
pp. 1-9
Author(s):  
Kim E. Hawkins ◽  
Elodie Chiarovano ◽  
Serene S. Paul ◽  
Ann M Burgess ◽  
Hamish G. MacDougall ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Semicircular Canal ◽  
Neurodegenerative Disorder ◽  
Vestibular Function ◽  
Head Impulse Test ◽  
Healthy Controls ◽  
Video Head Impulse Test ◽  
Head Impulse ◽  
Vestibulo Ocular Reflex

BACKGROUND: Parkinson’s disease (PD) is a common multi-system neurodegenerative disorder with possible vestibular system dysfunction, but prior vestibular function test findings are equivocal. OBJECTIVE: To report and compare vestibulo-ocular reflex (VOR) gain as measured by the video head impulse test (vHIT) in participants with PD, including tremor dominant and postural instability/gait dysfunction phenotypes, with healthy controls (HC). METHODS: Forty participants with PD and 40 age- and gender-matched HC had their vestibular function assessed. Lateral and vertical semicircular canal VOR gains were measured with vHIT. VOR canal gains between PD participants and HC were compared with independent samples t-tests. Two distinct PD phenotypes were compared to HC using Tukey’s ANOVA. The relationship of VOR gain with PD duration, phenotype, severity and age were investigated using logistic regression. RESULTS: There were no significant differences between groups in vHIT VOR gain for lateral or vertical canals. There was no evidence of an effect of PD severity, phenotype or age on VOR gains in the PD group. CONCLUSION: The impulsive angular VOR pathways are not significantly affected by the pathophysiological changes associated with mild to moderate PD.

scholarly journals Role of the Patient’s History of Vestibular Symptoms in the Clinical Evaluation of the Bedside Head-Impulse Test

2017 ◽  
Vol 8 ◽  
Author(s):  
Christoph Helmchen ◽  
Julia Knauss ◽  
Peter Trillenberg ◽  
Anita Frendl ◽  
Andreas Sprenger
Keyword(s):  
Clinical Evaluation ◽  
Head Impulse Test ◽  
Head Impulse ◽  
History Of ◽  
Vestibular Symptoms ◽  
Patient’S History

scholarly journals The Video Head Impulse Test (vHIT) Detects Vertical Semicircular Canal Dysfunction

PLoS ONE ◽  
2013 ◽  
Vol 8 (4) ◽  
pp. e61488 ◽  
Author(s):  
Hamish Gavin MacDougall ◽  
Leigh Andrew McGarvie ◽  
Gabor Michael Halmagyi ◽  
Ian Stewart Curthoys ◽  
Konrad Peter Weber
Keyword(s):  
Semicircular Canal ◽  
Head Impulse Test ◽  
Video Head Impulse Test ◽  
Head Impulse ◽  
Vertical Semicircular Canal

Comparison of three diagnostic tests in detecting vestibular deficit in patients with peripheral vestibulopathy

2015 ◽  
Vol 130 (2) ◽  
pp. 145-150 ◽  
Author(s):  
P Eza-Nuñez ◽  
C Fariñas-Alvarez ◽  
N Perez Fernandez
Keyword(s):  
Statistical Power ◽  
Laboratory Data ◽  
Head Impulse Test ◽  
Video Head Impulse Test ◽  
Test Results ◽  
Horizontal Semicircular Canal ◽  
Predictive Values ◽  
Head Impulse ◽  
Peripheral Vestibulopathy ◽  
Line Test

AbstractObjectives:This study aimed to evaluate the results of the video head impulse test and of the caloric and rotatory chair tests in patients with dizziness. Agreement between test results was assessed and the best protocol for detecting peripheral vestibulopathy was identified.Methods:Participants comprised 116 patients, 75 with a peripheral vestibulopathy and 41 with non-peripheral vestibulopathy. The main outcome measures were classified as normal or abnormal according to our laboratory data.Results:Agreement between tests was low. Vestibulopathy testing that required all three results to be abnormal had a sensitivity of 0.547, a specificity of 0.878, and positive and negative predictive values of 0.891 and 0.514, respectively. Vestibulopathy testing that required just one result to be abnormal had a sensitivity of 0.933, a specificity of 0.292, and positive and negative predictive values of 0.701 and 0.705, respectively.Conclusion:In peripheral vestibulopathy, there was weak concordance in the assessment of horizontal semicircular canal function among the different tests. However, the video head impulse test had sufficient statistical power to be recommended as the first-line test.

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