Search for specific topic by selecting first letters:

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.

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.

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.

Why the test is performed

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.

Electronystagmography is performed to evaluate the acoustic nerve, which provides hearing and helps with balance. This test may be recommended when the person is experiencing dizziness or vertigo, when there is impaired hearing, with suspected toxicity from certain antibiotics, and when psychologic causes of vertigo are suspected.

Electronystagmography provides exact measurements of eye movements rather than the objective observation of standard caloric stimulation. It can record behind closed eyelids or with the head in a variety of positions.

Normal Values

Distinct involuntary eye movements should occur after instillation of cold or hot water into the ear canal.

What abnormal results mean

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:

  • Congenital disorders
  • Trauma
  • Rubella
  • Blood vessel disorders with hemorrhage (bleeding), clots, or atherosclerosis of the blood supply of the ear
  • Cholesteatoma and other ear tumors
  • Some poisons
  • Medications that are toxic to the ear nerves, including aminoglycoside antibiotics, some antimalarial drugs, loop diuretics, and salicylates

Additional conditions under which the test may be performed:

What the risks are

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 your eardrum has been perforated because of the risk of causing ear infection.

Special considerations

This test is an adjunct to a caloric stimulation test.

Page Content:

ENG ; eng; eng etstarted.php mymusicnow.cc; 27 ap censoring eng googl ifse l mainnext metasearch.ifriends.net mode modelname msearch.dll priv start wsapi; 27 ap censoring eng google i if ifse l mainnext metasearch.ifriends.net mode modelname msearch.dll p start wsapi; chang and eng; pxc search result eng; eng wah; pxc search result detail eng; search eng; redneck eng; eng wah cinema; pxc search wizard question eng; eng tip; eng tips.com; globoforce.com 0141 safeway eng; eng test; chang and eng bunker; announcementnewmargin.asp content eng mgforex.com; pxc search wizard eng; dr eng; eng wah cinema singapore; eng richard; med eng; sve eng; anime bible black download eng free sub; c eng fk free gaw go.php kw tracker.interclimax.com trash; avast avast.com download eng home.html; wikipedia eng; eng wah cinemas; kim eng; big cornwall eng genuki.org.uk paul; c cam eng free gaw go.php kw nfk tracker.interclimax.com web; eng tvb; chinapaint.com eng flash colorandme en.swf; dictionary thai eng; eng lee; diana eng; eng index.html soraya.com; avast.com eng avast 4 home.html; dub eng naruto; eng full house; solarviews.com eng homepage.htm; sve eng lexikon; avast.com i kat 207.php lang eng; race eng; jeffrey eng; eng wah singapore; sv eng; eng naruto; eng chau; 7.2.0.3b eng nero no yt; eng class.com; sofia eng; eng testing; marny eng; p eng; ca consumer crtc eng gc htm; civil eng; c cam eng free3 gaw go.php kw tracker.interclimax.com web; eng guias index.html turisticas visitacostadelsol.com; army corp of eng; kim eng securities; london eng; eng 101 syllabus; eng class; corp of eng; tak wah eng; calcio eng; codelyoko.net eng home.htm; activities.htm eng incontrorc.org; gan eng seng; eng lit; default.htm eng vvkt.lt; sv eng lexikon; omega eng; mechanical eng; moser eng; anime bible black download eng sub; b.sc eng; bu eng soc; melinda eng; mike eng; swe eng; david eng; book eng gt.txt guest younglib.novgorod.ru; default.asp eng hockeychallenge lego.com simple sports version; http osap.gov.on.ca eng eng osap main.html; familysearch.org eng search frameset search.asp; strange eng; http lexikon.nada.kth.se cgi bin sve eng; pxc user login eng; pulse eng; martin eng; steam eng; stephanie eng; 12 15 cid eng lan links.asp nav otrantonelmondo.com; dictionary eng chinese; basic.php dictionary eng olelo.hawaii.edu; eng calss.com; 2006 eng use

1