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Electronystagmography

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Electronystagmography

Definition:

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.

Alternative Names:
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How the test is performed:

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.

A standard caloric stimulation test is performed, with cold or hot water instilled into the ear canal. Each ear is tested separately. The duration and velocity (speed) of eye movements that occur when the inner ear is stimulated are recorded by the electrodes.

The test takes about 90 minutes. It is performed by an audiologist and interpreted by an ENT specialist.

How to prepare for the test:

No preparation is necessary. Check with your health care provider if you are taking any medications.

For infants and children:

The preparation you can provide for this test depends on your child's age and experience. For general information regarding how you can prepare your child, see the following topics:

• Infant test or procedure preparation (birth to 1 year)
• Toddler test or procedure preparation (1 to 3 years)
• Preschooler test or procedure preparation (3 to 6 years)
• Schoolage test or procedure preparation (6 to 12 years)
• Adolescent test or procedure preparation (12 to 18 years)

How the test will feel:

There is minimal discomfort. You may find cold water in the ear uncomfortable. Brief vertigo may occur during the test.