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EMG of the Shoulder  
EMG shoulder 2

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Definition  

Electromyography (EMG) measures and records the electrical activity of a muscle. The test can record a muscle's electrical activity at rest or during a muscle contraction.

An EMG is often done with nerve conduction studies . These studies can analyze the electrical activity in your nerves.

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Reasons for Test  

EMG is most often done to:

  • Aid in diagnosing the source of pain, cramping, or weakness
  • Differentiate between true muscle weakness and limitations due to pain
  • Determine if muscles and nerves are working properly
  • Distinguish between muscle and nerve disorders
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Possible Complications  

Problems from the procedure are rare, but all procedures have some risk. Your doctor will review potential problems, like:

  • Bleeding
  • Pain or bruising at the needle insertion site
  • Infection at the needs insertion site
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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.