Range of Peak Head Velocity in Video Head Impulse Testing for Pediatric Patients

Objective: To examine peak head velocity in video head impulse testing of pediatric patients and its effect on vestibulo-ocular reflex (VOR) gain. Study Design: Retrospective case review. Setting: Tertiary referral center. Patients: Pediatric patients ages 3 to 18 years old who underwent video head impulse testing during clinical evaluation of dizziness and/or imbalance. Intervention(s): Conducted video head impulse test (vHIT) in horizontal, left anterior–right posterior (LARP), and right anterior–left posterior (RALP) planes. Main Outcome Measure(s): Peak head velocity and mean VOR gain for individual semicircular canals in different age groups. Results: For the horizontal plane, vHIT peak head velocity greater than 150 degrees/s was achieved in 43 to 63% of 219 patients. In contrast, vHIT peak head velocity greater than 150 degrees/s was achieved in only 3 to 14% for the LARP and RALP planes. Analyses of differences in mean VOR gains among three ranges of peak head velocity (100–125 degrees/s, 126–150 degrees/s, and >150 degrees/s) by paired-t tests were not significant (p > 0.05) within individual patients. Mean VOR gains of three vertical canals in younger patients were significantly lower with higher peak head velocities compared with older children (p 

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