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What is a nerve conduction velocity test (NCV)?
A nerve conduction velocity test (NCV) is an electrical test that is used to determine the adequacy of the conduction of the nerve impulse as it courses down a nerve. This test is used to detect signs of nerve injury.
In this test, the nerve is electrically stimulated, and the electrical impulse 'down stream' from the stimulus is measured. This is usually done with surface patch electrodes (they are similar to those used for an electrocardiogram) that are placed on the skin over the nerve at various locations. One electrode stimulates the nerve with a very mild electrical impulse. The resulting electrical activity is recorded by the other electrodes. The distance between electrodes and the time it takes for electrical impulses to travel between electrodes are used to calculate the speed of impulse transmission (nerve conduction velocity). A decreased speed of transmission indicates nerve disease or abnormal pressure on the nerve. A nerve conduction velocity test is often done at the same time as an electromyogram (EMG). An EMG is carried out in order to exclude or detect muscle conditions which may be present due to muscular or neurologic disease.
Why the nerve conduction velocity test is performed
Symptoms that might prompt a health care professional to order a nerve conduction velocity test test include numbness, tingling, and/or burning sensations. The nerve conduction velocity test test can be used to detect true nerve disorders (such as peripheral neuropathy and mononeuritis multiplex) or conditions whereby nerves are affected by mechanical compression injury (such as carpal tunnel syndrome and other compression neuropathies). A normal body temperature must be maintained for the nerve conduction velocity test, because low body temperatures slow the speed of nerve conduction.
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Horowitz, Steven H. "Overview of nerve conduction studies." UptoDate. Updated Feb. 19, 2014.
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Carpal Tunnel SyndromeCarpal tunnel syndrome is a condition in which irritation of the wrist's median nerve causes tingling and numbness of the thumb, index, and the middle fingers. Treatment of carpal tunnel syndrome depends on the severity of the symptoms and the nature of any disease that might be causing the symptoms.
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Diabetic Neuropathy (Symptoms, Causes, Diagnosis, Treatment)
Diabetic neuropathy a condition in which nerve damage has occurred as a complication of diabetes. The pain from the nerve damage can be severe with tingling or numbness in the part of the body affected. Diabetic neuropathy can occur anywhere in the body. Diabetic neuropathy can cause symptoms like intense pain, numbness, burning, or tingling in the part of the body affected by the condition.
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Electromyogram (EMG)Electromyogram or EMG is defined as a test that records the electrical activity of muscles. Normal muscles produce a typical pattern of electrical current that is usually proportional to the level of muscle activity. Diseases of muscle and/or nerves can produce abnormal electormyogram patterns.
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