Electromyography and Nerve Conduction Velocity (also called: EMG & NCV, nerve conduction study, myogram )

What is it?

A test that measures the electrical activity of muscles.

What is the purpose?

To determine the degree and site of nerve compression. Measures the nerve cnduction path. To evaluate disorders of the muscles and nerves.

Is there any special preparation?

No special prep is required . You may be asked to sign a consent form.

How is it done?

NCV-Patch like electrodes are placed on various locations on the skin, over nerves. One electrode gives the nerve a very mild electrical charge and the other records the resulting activity.

EMG-Very slender needle-like electrodes are inserted through the skin into the muscles. Electrical activity is measured through the electrode and recorded on a graph.

What happens afterwards?

There should be no special instructions or after effects.

What are the risks of this procedure?

Very minimal risk of infection since it is an invasive procedure.

Does it hurt?

You may feel very small electrical shocks, although these are usually so small that they cannot be felt.

For more information:

Lycos/WebMD

Electromyography

Adam.com 

References:
Clinical Reference Systems
MedicineNet