C J Yang1, J Y Lee1, B C Kang1, H S Lee1, M H Yoo2, H J Park3. 1. Department of Otolaryngology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. 2. Department of Otorhinolaryngology-Head & Neck Surgery, Korea University Ansan Hospital, Ansan, Korea. 3. Department of Otolaryngology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. dzness@amc.seoul.kr.
Abstract
OBJECTIVES: To 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). DESIGN: Prospective cohort study. SETTING: Tertiary care academic referral centre. PARTICIPANTS: Fifty 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 MEASURES: vHIT gains and the incidence and amplitudes of covert and overt CSs. RESULTS: The 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. CONCLUSIONS: vHIT 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.
OBJECTIVES: To 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). DESIGN: Prospective cohort study. SETTING: Tertiary care academic referral centre. PARTICIPANTS: Fifty 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 MEASURES: vHIT gains and the incidence and amplitudes of covert and overt CSs. RESULTS: The 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. CONCLUSIONS: vHIT 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.
Authors: Helen S Cohen; Jasmine Stitz; Haleh Sangi-Haghpeykar; Susan P Williams; Ajitkumar P Mulavara; Brian T Peters; Jacob J Bloomberg Journal: Acta Otolaryngol Date: 2017-11-16 Impact factor: 1.494
Authors: Charlotte Johnson; Ann Hallemans; Evi Verbecque; Charlotte De Vestel; Nolan Herssens; Luc Vereeck Journal: J Int Adv Otol Date: 2020-12 Impact factor: 1.017