Munson Health
 
Electromyography

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by Keel JC

(EMG)

 

What to Expect

Prior to Test

Make sure you talk to your doctor about the medications you are taking. You may be asked to adjust certain medications up to a week before the test, such as:
  • Aspirin or other non-steroidal anti-inflammatory drugs (NSAIDs)
  • Blood thinners
  • Anti-platelets
On the day before and day of the test:
  • If you have myasthenia gravis , ask if you should take any medication before the test.
  • If directed to, avoid cigarettes, coffee, tea, and soft drinks for 2-3 hours before the test.
  • Take a bath or shower before the test.
  • On the day before, do not use lotion or oil.
  • Wear comfortable clothing. You will have to change into a hospital gown.
  • Tell your doctor if you have a pacemaker or other implanted device.

Description of the Test

A small needle electrode will be inserted into a muscle at rest. You will be asked to rest or contract the muscle. The electrical activity picked up by the needle will produce a waveform. The waveform will be recorded and analyzed. The test is repeated on different muscles and limbs.

After Test

You will be able to leave once the test is done. Once you are home:
  • Resume any medications you stopped before the test
  • Resume normal activities as tolerated

How Long Will It Take?

30-90 minutes

Will It Hurt?

You may have some pain when the needle electrodes are inserted. The insertion feels like an injection into the muscle.
After the test, you may have muscle aches and discomfort for several days. Warm compresses and pain medication may help.

Results

The doctor doing the EMG may discuss the results with you. A report will also be sent to your regular doctor. Your doctor will discuss treatment options based on the tests and other factors.
 

RESOURCES

National Institutes of Health
http://www.nih.gov

National Institute of Neurological Disorders and Stroke
http://www.ninds.nih.gov

 

CANADIAN RESOURCES

Health Canada
http://www.hc-sc.gc.ca

Muscular Dystrophy Canada
http://www.muscle.ca

 

References


Electromyography (EMG). Johns Hopkins Medicine website. Available at: http://www.hopkinsmedicine.org/healthlibrary/test%5Fprocedures/neurological/electromyography%5Femg%5F92,P07656 . Accessed July 31, 2013.


FAQ: patient information. American Association of Neuromuscular & Electrodiagnostic Medicine website. Available at: http://www.aanem.org/Education/Patient-Resources/Learn-About-an-EMG.aspx . Accessed July 31, 2013.

 

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