
doi: 10.1111/coa.12558
pmid: 26453356
ObjectivesTo evaluate video‐head‐impulse test (vHIT) results in normal subjects, to determine the normative values of vHIT for the vestibulo‐ocular reflex (VOR) and to characterise the catch‐up saccades (CSs).DesignProspective cohort study.SettingTertiary care academic referral centre.ParticipantsFifty healthy subjects with no history of vestibular impairment, ten each in their 20's, 30's, 40's, 50's and 60's, underwent vHITs in the lateral semicircular canal plane.Main outcome measuresvHIT gains and the incidence and amplitudes of covert and overt CSs.ResultsThe mean vHIT gain was 1.02 ± 0.07, and the mean gain asymmetry was 2.39 ± 1.96%, with no significant differences among age groups. CSs were observed during 22.6% of the trials and in 49% of the ears. The incidence of CSs was not associated with age. The mean velocity of CSs was 55.5 ± 16.9°/s, and its mean interaural difference was 11.8 ± 10.7°/s.ConclusionsvHIT gains were consistently equal to 1.0 in all age groups (20's to 60's), suggesting that abnormal criteria for vHIT gain (e.g. 0.8) and gain asymmetry (e.g. 8%) can be used, regardless of age. CSs were observed in about half of normal ears, suggesting that VOR is a hypometric system. The amplitudes and interaural difference of CSs were also similar in all age groups, suggesting that abnormal criteria for CS amplitude (e.g. 100°/s) and interaural difference (e.g. 40°/s) can be used, regardless of age.
Adult, Male, Video Recording, Reflex, Vestibulo-Ocular, Middle Aged, Reference Values, Head Movements, Saccades, Humans, Female, Prospective Studies, Head Impulse Test, Aged
Adult, Male, Video Recording, Reflex, Vestibulo-Ocular, Middle Aged, Reference Values, Head Movements, Saccades, Humans, Female, Prospective Studies, Head Impulse Test, Aged
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