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Brain
Brain


Brain wave monitor
Brain wave monitor


Definition:

Brainstem auditory evoked response (BAER) is a test to measure the brain wave activity that occurs in response to clicks or certain tones.



Alternative Names:

Evoked auditory potentials; BAEP - brainstem auditory evoked potentials; Evoked response audiometry



How the test is performed:

You lie on a reclining chair or bed and remain still. Electrodes are placed on your scalp and on each earlobe. The earphones give off a brief click or tone. The electrodes pick up the brain's responses to these sounds and record them. You do not need to be awake for this test.



How to prepare for the test:

You may be asked to wash your hair the night before the test.



How the test will feel:

There is little discomfort.



Why the test is performed:

The test is done to help diagnose nervous system problems and hearing losses (especially in low birth weight newborns), and to assess neurological functions.



Normal Values:

The normal range for auditory brain stem values will vary among patients and with the instruments used.



What abnormal results mean:

Abnormal test results may indicate a hearing loss , multiple sclerosis , or stroke.

Additional conditions under which the test may be performed:

This test may also be performed during surgery to decrease the risk of injury to the auditory nerve and the brain.



What the risks are:

There are no risks.



Special considerations:




Review Date: 10/20/2008
Reviewed By: Luc Jasmin, MD, PhD, Departments of Anatomy and Neurological Surgery, University of California, San Francisco, CA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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