ENTcare: Electrostagmography (ENG)

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ELECTRONSTAGMOGRAPHY (ENG)

Electronystagmography (ENG) is a computerized test that measures the presence, intensity, and direction of eye movements (nystagmus) during specific types of stimulation. It is used to evaluate people with vertigo (a false sense of spinning or motion that can cause dizziness) and certain other disorders that affect hearing and vision.

Electrodes are placed at locations above and below the eye to record electrical activity. A standard ENG test battery consists of 3 parts: occulomotor evaluation, positional testing, and caloric stimulation of the vestibular system. The comparison of results obtained from various subtests of ENG assists in determining whether a disorder is central or peripheral. A central disorder is related to your neurologic system and how it interprets balance information. A peripheral disorder is related to an individual part of your balance system external to your brain and central nervous system (i.e. inner ear, eyes, joints and muscles). While ENG is the most widely used clinical laboratory test to assess vestibular function, it should be used in conjunction with other testing and information to accurately determine a

diagnosis. ENG abnormalities can be useful in the diagnosis and localization of site of lesion; however, many abnormalities are nonlocalizing; therefore, the clinical history and otologic examination of the patient are vital in formulating a diagnosis and treatment plan for a patient presenting with dizziness or vertigo.

Patient Risks with ENG Testing
The greatest risk involved with ENG testing is the likelihood of increased nausea or dizziness through specific portions of the test or at the conclusion of the test. For this reason we typically suggest that a friend or family member accompany the patient to ensure their safety returning home after the test.

We utilize closed-loop water calorics in the final part of our ENG testing. This involves cold or warm water, enclosed in a balloon, being passed through the middle ear space. Because this can create some pressure, it can be uncomfortable to some patients. It is also not recommended that this portion of the test be performed on patients with a history of recent ear drum perforation.

There may be other risks depending upon your specific medical condition. Be sure to discuss any concerns with your physician prior to the procedure.

Preparing for ENG Testing

Your physician or a staff member will explain the procedure to you and offer you the opportunity to ask any questions that you might have about the procedure. We will also do our best to explain each portion of the test as we progress through the procedure.
You may be asked to sign a consent form that gives your permission to do the procedure. Read the form carefully and ask questions if something is not clear.
 
Because of the possibility of increased nausea, we do suggest not eating 4 hours prior to your test.
 
Avoid consuming caffeine and alcohol for 24 to 48 hours before the test.
 
Discontinue taking sedatives, tranquilizers, and any other medications as instructed by your physician before the test. If you have any questions about a specific medication, please contact our office.
Clean your ears of excessive earwax. Before the ENG, your ears will be examined for the presence of wax, inflammation, or other problems that may interfere with the test.
 
If you wear eyeglasses and/or a hearing aid, bring them with you to the test.
 
Due to the use of adhesive electrodes and the need for a clean site for contact it is recommended to female patients to minimize or avoid applying facial make-up, especially around the eyes.
Based upon your medical condition, your physician may request other specific preparation.