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Alternative names
ENGDefinition Return to top
Electronystagmography records involuntary eye movements. The test is used to determine whether ear nerve damage is the cause of dizziness or vertigo. Damage to the nerve of the inner ear is one of the more common causes of vertigo.
How the test is performed Return to top
Metal electrodes (similar to those used with ECG, but smaller) are placed to the side, above, and below each eye. They may be attached by adhesive or by a band around the head. A "ground" electrode is attached to the forehead. These electrodes record eye movements relative to the position of the ground electrode.How to prepare for the test Return to top
No preparation is necessary. Check with your health care provider if you are taking any medications.How the test will feel Return to top
There is minimal discomfort. Some people find cold water in the ear uncomfortable. Brief vertigo may occur during the test.Why the test is performed Return to top
This test is used to determine if ear nerve damage is a cause of dizziness or vertigo. Damage to the vestibular portion of the acoustic nerve (the nerve of the inner ear) is one of the more common causes of vertigo.Normal Values Return to top
Distinct involuntary eye movements should occur after instillation of cold or hot water into the ear canal.What abnormal results mean Return to top
If the expected eye movements do not occur, there may be some damage to the nerve of the inner ear.
Any disease or injury that damages the acoustic nerve can cause vertigo. This may include:
Additional conditions under which the test may be performed:
What the risks are Return to top
A risk is associated with the caloric stimulation part of the test. Excessive water pressure can injure a previously damaged eardrum, but this rarely occurs. Caloric stimulation should not be performed if the eardrum is perforated because of the risk of causing ear infection.Special considerations Return to top
This test is an adjunct to a caloric stimulation test. Update Date: 5/12/2003 Updated by: Elaine T. Kiriakopoulos, M.D., M.Sc., Department of Neurology, Beth Israel Deaconess Medical Center, Harvard University, Boston, MA. Review provided by VeriMed Healthcare Network.
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Page last updated: 28 October 2004 |