Certain factors or conditions may interfere with EMG test results. Be sure to discuss any concerns with your physician prior to the procedure.
There may be other risks depending upon your specific medical condition. It also may be contraindicated in persons with extensive skin infections due to the risk of a spreading infection from the skin to the muscle. EMG may be contraindicated in persons receiving anticoagulant therapy (blood thinning medication such as Coumadin) because the needle electrodes may cause bleeding within the muscle. The insertion of the electrodes may also cause false results on a muscle biopsy or during blood tests in which muscle enzymes are measured. Afterwards, the muscle may feel sore for a few days and a bruise may appear at the needle stick site. Some discomfort, similar to the feeling of an injection or an acupuncture needle, may be felt when the needle electrodes are inserted into the muscle.
Both procedures help to detect the presence, location, and extent of diseases that damage the nerves and muscles. NCV can determine nerve damage and destruction, and is often performed at the same time as EMG. NCV is a measurement of the speed of conduction of an electrical impulse through a nerve. A related procedure that may be performed is nerve conduction velocity (NCV). An audio-amplifier is used so the activity can be heard. The electrical activity picked up by the electrodes is then displayed on an oscilliscope (a monitor that displays electrical activity in the form of waves). During the test, one or more small needles (also called electrodes) are inserted through the skin into the muscle. The test is used to help detect neuromuscular abnormalities. Electromyography (EMG) measures muscle response or electrical activity in response to a nerve’s stimulation of the muscle.
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