Videonystagmography (VNG)
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What is Videonystagmography (VNG)?
Videonystagmography (VNG or VN) is a test used to examine the inner ear's balance function. During the test, electrodes are placed around the eyes, and a video recording is taken while the eyes move. The recording can detect any abnormal movements of the eyes, which can indicate a balance disorder.
Preparation for VNG Test
Before having the VNG test, an audiologist or doctor will discuss with the patient the procedure and any questions they have. There is no special preparation needed before the test, apart from removing any eye makeup.
VNG Test Procedure
During the VNG test, special goggles with electrodes around the eyes are used to record the eye movements. These goggles are connected to a computer, which records the small eye movements caused by the inner ear's balance system when stimuli such as hot and cold air, sound or light is used. The recording is then analyzed by a specialist to detect any problems with balance.
Types of VNG Tests
There are two main types of VNG tests. The computerized VNG test uses advanced digital equipment to measure the eye movement. The other type is the electronystagmography test, which uses electrodes placed around the eyes to measure the electrical activity in the brain.
Uses of VNG Tests
The VNG test is used to diagnose balance disorders such as labyrinthitis, Ménière's disease and benign paroxysmal positional vertigo (BPPV). It can also help to identify the cause of dizziness or dizzy spells. It is also used to evaluate the effects of certain medications or to evaluate the progress of treatment for a balance disorder.
Risks Associated with VNG
The VNG test is generally safe with few risks. Some patients may experience redness or a mild burning sensation around their eyes where the electrodes were placed. There is also a risk of false positive or false negative results due to the limitations of the technology.
When is a VNG Test Needed?
A VNG test is usually performed when a patient is experiencing symptoms of a balance disorder such as dizziness, vertigo or vertigo-related nausea. It can be used to evaluate the severity of the disorder, as well as the response to treatment. It can also be used to detect any central nervous system disorders that might be responsible for balance problems.
