1. Role of video-head impulse test in lateralization of vestibulopathy: Comparative study with caloric test.
- Author
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Park, Pona, Park, Joo Hyun, Kim, Ji Soo, and Koo, Ja-Won
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DIAGNOSIS of ear diseases , *CEREBRAL dominance , *VESTIBULO-ocular reflex , *VERTIGO , *CALORIC expenditure , *RECEIVER operating characteristic curves , *VERTIGO diagnosis , *VESTIBULAR apparatus diseases , *COMPARATIVE studies , *RESEARCH methodology , *MEDICAL cooperation , *REFLEXES , *RESEARCH , *VESTIBULAR function tests , *VIDEO recording , *EVALUATION research , *CASE-control method , *DIAGNOSIS - Abstract
Objective: To evaluate the lateralization value of video head-impulse test (vHIT) for the diagnosis of vestibulopathy and to analyze cases showing dissociated results with caloric test.Methods: In total, 19 healthy volunteers and 92 dizzy patients who underwent both a caloric test and a vHIT were enrolled. Patients were divided into two groups depending on their fluctuating pattern of vertigo. The vestibulo-ocular reflex (VOR) gain and gain asymmetry (GA) of a vHIT as well as unilateral weakness (UW) and the sum of the slow-phase velocities (SPVs) of warm and cold irrigation of the same side were compared. A cutoff value of VOR gain of a vHIT was also calculated using a receiver-operating characteristic curve.Results: A VOR gain in an affected ear and GA of a vHIT showed a statistically significant correlation with UW in a caloric test. The cutoff value of a vHIT was determined to be 0.875, derived under the assumption that UW of a caloric test ≤25% is normal. However, the parameters of the two tests were dissociated in 18%.Conclusion: A VOR gain of vHIT is a valuable objective parameter with a lateralization value determining vestibular hypofunction. However, considering substantial dissociation between a vHIT and a caloric test, these tests can be complementary tools for the lateralization of vestibular impairment for the comprehensive evaluation of patients' VOR. [ABSTRACT FROM AUTHOR]- Published
- 2017
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