Jessie Patterson1, Amanda Rodriguez1,2, Kamran Barin3, Kristen L Janky1. 1. Department of Audiology, Boys Town National Research Hospital, Omaha, Nebraska. 2. Department of Special Education and Communication Disorders, University of Nebraska-Lincoln, Lincoln, Nebraska. 3. Department of Otolaryngology-Head & Neck Surgery (Emeritus), The Ohio State University, Columbus, Ohio.
Abstract
OBJECTIVE: To evaluate the effect of gaze angle on vertical vestibulo-ocular reflex (VOR) gain using two different video head impulse (vHIT) devices in healthy adults and subjects with bilateral vestibular loss (BVL). STUDY DESIGN: Prospective study. SETTING: Hospital research laboratory. SUBJECTS: Twenty-four healthy adults (mean [standard deviation {SD}] age = 32 [4.8]; 23-42; 8 men) and four subjects with previously diagnosed BVL (mean age [SD] = 32 [8.2]; 21-40; 3 men) participated. INTERVENTION: Vertical canal vHIT was administered with two different devices using three gaze angles (-45 degrees, 0 degree, +45 degrees). These devices have different gain calculation algorithms and different head and gaze angle protocols. MAIN OUTCOME MEASURES: Vertical canal gain and presence or absence of reset saccades. RESULTS: A significant stepwise reduction in vHIT gain was noted as gaze moved away from the plane of the canals stimulated (from -45 degrees to 0 degree, to +45 degrees) for both healthy adults and subjects with BVL. vHIT gain was able to separate the two groups using gaze angles -45 degrees and 0 degree. CONCLUSIONS: In spite of their differences in gain algorithm and recommended head position and gaze angle, each device was able to appropriately separate healthy adults from subjects with BVL with high sensitivity/specificity.
OBJECTIVE: To evaluate the effect of gaze angle on vertical vestibulo-ocular reflex (VOR) gain using two different video head impulse (vHIT) devices in healthy adults and subjects with bilateral vestibular loss (BVL). STUDY DESIGN: Prospective study. SETTING: Hospital research laboratory. SUBJECTS: Twenty-four healthy adults (mean [standard deviation {SD}] age = 32 [4.8]; 23-42; 8 men) and four subjects with previously diagnosed BVL (mean age [SD] = 32 [8.2]; 21-40; 3 men) participated. INTERVENTION: Vertical canal vHIT was administered with two different devices using three gaze angles (-45 degrees, 0 degree, +45 degrees). These devices have different gain calculation algorithms and different head and gaze angle protocols. MAIN OUTCOME MEASURES: Vertical canal gain and presence or absence of reset saccades. RESULTS: A significant stepwise reduction in vHIT gain was noted as gaze moved away from the plane of the canals stimulated (from -45 degrees to 0 degree, to +45 degrees) for both healthy adults and subjects with BVL. vHIT gain was able to separate the two groups using gaze angles -45 degrees and 0 degree. CONCLUSIONS: In spite of their differences in gain algorithm and recommended head position and gaze angle, each device was able to appropriately separate healthy adults from subjects with BVL with high sensitivity/specificity.
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