A 50-year-old female patient visited the emergency department of a university hospital complaining of sudden-onset vertigo. Symptoms initiatedwhile the patient was seated at a table andworsened whenever she moved her head. One month prior, the patient had been admitted to a hospital for 2 weeks for geotropic benign paroxysmal positional vertigo of the right lateral semicircular canal (LSCC). At...

OBJECTIVE To evaluate a novel test for dynamic visual acuity (DVA) that uses an adaptive algorithm for changing the size of Landolt rings presented during active or passive head impulses, and to compare the results with search-coil head impulse testing. DESIGN Prospective study in healthy individuals and patients with peripheral vestibular deficits. SETTING Tertiary academic center. PARTI...

Background. False negative fistula testing in patients with chronic suppurative otitis media is a dilemma when proceeding to surgery. It is imperative to rule out a dead labyrinth or a mass effect secondary to the cholesteatoma in an otherwise normally functioning inner ear. We present a case series of three patients in whom a bedside vestibuloocular reflex (VOR) evaluation using a head impulse...

We studied the human vestibulo-ocular reflex (VOR) in response to head 'impulses': brief, unpredictable, passive, high-acceleration (up to 4000 degrees/s2), low-amplitude (20-30 degrees) head rotations. We delivered the head impulses approximately in the plane of the semicircular canal (SCC) being tested. To test the anterior and posterior SCCs, the head impulses were delivered in a diagonal pl...

BACKGROUND/HYPOTHESIS With the video head impulse test (vHIT), the vertical VOR gain is defined as (vertical eye velocity/vertical head velocity), but compensatory eye movements to vertical canal stimulation usually have a torsional component. To minimize the contribution of torsion to the eye movement measurement, the horizontal gaze direction should be directed 40° from straight ahead so it i...