AVERT is a randomized multicenter clinical trial evaluating video-oculography (VOG), nystagmography and audiometry in patients presenting to an emergency department with dizziness or vertigo. The study will determine if these non-invasive tests of eye movement and hearing, when combined with a structured treatment plan, result in a better diagnosis. More than 1 million people visit the ED each year due to dizziness. About 5% of these patients have life-threatening strokes but a third of those are mis-diagnosed. It is hoped that the findings from this study will save lives and reduce costs through faster diagnosis and more appropriate treatment.