Videonystamography (VNG) allows audiologists to assist your physician in determining the cause of your dizziness. As dizziness is one of the most difficult things to diagnose a cause of, this test helps determine if your symptoms are coming from your ear, your brain, or possibly another part of your body like your legs or heart. Before this test, it is very important to think about your dizziness and find a way to describe it without use the words “dizzy” or “vertigo”. These words are very vague and mean different things to different people.
Before your test, you should be given a sheet with instructions. They include no food for at least 4 hours before testing, avoiding caffeine and nicotine for 48 hours, and avoiding any non-essential narcotics, suppressants, or stimulants for at least 48 hours before the test. All of these things can skew the information obtained during the test and cause it to be inconclusive.
When you arrive for your test, you will be taken to an exam room and your history will be reviewed. Next, a set of goggles will be placed over your eyes. These goggles allow us to view your eye movements and monitor how they change with different tests. The lights in the room will be dimmed and you will be asked to watch a dot on a TV screen. Next, you will be asked to lay in various positions to evaluate if head or body movement affect your symptoms. Finally, cool and warm air will be put in your ears to evaluate some of the ears contribution to dizziness.
It typically takes a few days to review and analyze the testing so results are not available the same day. You will likely have a follow up appointment with your physician to review the results of this evaluation.