vertigo evaluation negative

When the Dix-Hallpike (and everything else) is Negative

It is not uncommon to have a patient describing a history consistent with current active BPPV, and to have your exams, including Dix-Hallpike tests, be negative. My last post described techniques that can improve the likelihood of a positive test in these patients, but sometimes despite your best efforts, you cannot trigger an episode of…

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ocular counter roll (OCR) test

The Video Ocular Counter-Roll (vOCR): A New Means to Assess Utricle Function

The vestibular system (inner ear and brain pathways) has a primary role of providing visual stability associated with head movement through the vestibular ocular reflex (VOR). The VOR is able to provide visual stability by causing the eyes to move in the opposite direction of a head turn or head tilt. For instance, if a…

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