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Diagnostic Workup:
Nearly all new Center patients need a baseline measure of the primary vestibular and balance functions plus, in many cases, special vestibular test measures. The primary measure of vestibular function is Videonystagmography (VNG; a.k.a. ENG, electronystagmography) and the primary measure of balance function is the Computerized Dynamic Posturography (CDP). These two tests constitute the basic vestibular test battery.
The special test measures are the Dynamic Visual Acuity (DVA) to document and measure oscillopsia, Vestibular Evoked Myogenic Potential (VEMP) to assess saccular and inferior vestibular nerve function, the Rapid Head Thrust Test using scleral search coils (RHT) to evaluate specific semicircular canal function, the Rotational Chair Test to assess overall vestibular system performance, pediatric vestibular testing, and central compensation under precise rates of stimulation.
Many otoneurological practices provide primary vestibular testing; the UWMC is the only facility in the Northwest to offer this battery of special vestibular tests. Many patients only need primary testing. However, about half the patients referred to the UWMC for otoneurologic evaluation and care need special vestibular tests as well.