Head-Impulse Test in Unilateral Vestibular Loss
Video demonstrates a head-impulse test with scaled peak head velocities of 100-/s (A), 200-/s (B), and 300-/s (C) in a patient with left vestibular loss. Note the increasing salience of the catch-up saccades with stimulus size. The picture-in picture shows the online feedback trace (500 milliseconds) of angular head velocity (-/s) for the examiner. Head velocity was measured with a search coil mounted on a dental impression plate.
Reproduced with permission from Weber KP, Aw ST, Todd MJ, et al. Head impulse tests in unilateral vestibular loss: vestibulo-ocular reflex and catch-saccades. Neurology 2008;70(6):454Y463.
CONTINUUM: Lifelong Learning in Neurology. 18(5, Neuro-otology):1041-1059, October 2012