Video Head Impulse Testing (vHIT) and the assessment of horizontal semicircular canal function
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2015-01-01
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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.
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Riska, Kristal M, Owen Murnane, Faith W Akin and Courtney Hall (2015). Video Head Impulse Testing (vHIT) and the assessment of horizontal semicircular canal function. Journal of the American Academy of Audiology, 26(5). pp. 518–523. 10.3766/jaaa.14083 Retrieved from https://hdl.handle.net/10161/14011.
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Kristal Mills Riska
My research program’s overarching goals are to improve the diagnosis and management of dizziness, falls, and vestibular disorders. Her research focuses in three strategic areas: 1) improving the identification of Benign Paroxysmal Positional Vertigo in primary care settings to enable timely access to cost-effective treatment, 2) characterizing the role of vestibular function and rehabilitative strategies in post-concussive/mild traumatic brain injury related dizziness; and 3) identifying and understanding the mechanisms that mediate the association between falls and hearing loss in an effort to develop interventions that will modify falls risk in the hearing impaired population.
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