Nerve Conduction and Electromyography
 

 

What is EMG Testing? Why is an EMG test done?

 

An electromyogram (EMG) is a test used to detect abnormal electrical activity of muscles and nerves. 

It is performed when patients suffer from sciatica, radicular pain, tingling, numbness, and muscle weakness. 

Part I – Nerve Conduction Testing (NCV):

 

A nerve conduction velocity test is performed by stimulating the nerve and recording the electrical response 'down-stream'. The time taken by the electrical impulse to travel is referred to as nerve conduction velocity.  NCV is abnormal in radiculopathy, neuropathy, or compression of the nerve as in Carpal Tunnel Syndrome. 

Part II – Needle Examination (NCV):
 
 

A fine needle is inserted into the muscle to record the electrical activity. The size and shape of the waveform (called the action potential) provide information on the muscle function.  EMG test is used to detect muscle disorders like myopathy and also to test the neuromuscular junction where the nerve and the muscle meet.

How to come prepared for the test? Does it hurt? 

Please wear loose clothes like sweatpants and a T-shirt.  There is little discomfort with the test but our experienced physicians make it painless to undergo.

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