Video Head Impulse Test Protocol

vHIT was performed with a video-oculography device (Interacoustics, EyeSeeCam, Denmark). The subject was instructed to maintain the fixation on an earth-fixed target, which is usually straight ahead. Experienced otologists An experienced laboratory technician delivered at least 20 brief, abrupt, and unpredictable head impulses per side (10–20° angle, duration 150–200 ms, peak velocity of >150°/s). The VOR gain was defined as the ratio of the eye velocity (°/s) over the head velocity (°/s). Individual VOR gains were automatically calculated using the device software. vHIT testing was considered to be abnormal for horizontal canal if VOR gain at 60 ms was <0.8 (18 (link)).

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Liu Y., Zhang F., He B., He J., Zhang Q., Yang J, & Duan M. (2021). Vestibular Endolymphatic Hydrops Visualized by Magnetic Resonance Imaging and Its Correlation With Vestibular Functional Test in Patients With Unilateral Meniere's Disease. Frontiers in Surgery, 8, 673811.

Publication 2021

EyeSeeCam

Canal Device Head Laboratory technician Otologists

Corresponding Organization : Karolinska Institutet

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Variable analysis

independent variables

Head impulses per side (at least 20 brief, abrupt, and unpredictable head impulses per side)

dependent variables

VOR gain (ratio of the eye velocity (°/s) over the head velocity (°/s))

control variables

Fixation on an earth-fixed target, usually straight ahead
Head impulse angle (10–20° angle)
Head impulse duration (150–200 ms)
Head impulse peak velocity (>150°/s)

controls

No positive or negative controls were explicitly mentioned in the input protocol.

Annotations

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