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An electromyogram (EMG) is a test that measures the electrical
discharges made by the muscles. It can determine whether muscle weakness or
paralysis is due to a nerve problem or to a problem with the muscle
During an electromyogram, a thin needle is placed in a muscle to
measure its electrical activity at rest and during use. The needle is attached
to a machine with a viewing screen (like a TV) that displays electrical
activity in the muscles as waves on the screen.
Current as of:
February 20, 2015
Anne C. Poinier, MD - Internal Medicine & Colin Chalk, MD, CM, FRCPC - Neurology
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