Electromyogram or EMG is a test that helps diagnose a variety of disorders involving peripheral nerves, muscles and spinal nerves and symptoms including numbness or tingling, pain, muscle weakness, low back pain, sciatica, Carpal Tunnel syndrome or radiculopathy.
The test will take 30-45 minutes. There are two parts to the study: the nerve conduction studies and EMG needle study. Each part of the study gives information which will help to determine the functional quality of the peripheral nerves and muscles tested. This test may cause mild to moderate discomfort. A mild analgesic or ice may be used if there is discomfort. Occasional bruising may occur.
• Please arrive 15 minutes prior to your EMG appointment
• Come with clean skin, no creams or sanitizers on the body part being tested
• You may continue taking your regular medications/pain medications
• Wear or bring a t-shirt if your upper body is being tested
• Wear or bring shorts if your lower body is being tested
• Testing may take 30-45 minutes
• Small children will not be allowed in the testing site
• Patients referred from an outside physician must bring a prescription with them
• If you cannot make your appointment call or text 845-454-0120 to cancel. Appointments must be cancelled with at least 24
hour notice or a no show fee of $250 may apply
Needle electromyography (EMG) refers to the recording of muscle electrical activity using a thin pin electrode. The pin electrode is inserted through the skin into the muscle. During the insertion, the licensed practitoner determines the resistance of the muscle. The practioner also evaluates the electrical activity of the muscle both at rest and during contraction of the muscle. The pin electrode translates the amount and intensity of the electrical activity into waveforms displayed on a computer screen. The sounds of the electrical activity are also emitted and interpreted by the practitoner.
Therefore, the practitoner is not only using sight and touch, but also sound to determine the proper diagnosis. After the practitoner finishes examining one muscle, he or she analyzes all of the data - the waveform, the sounds, and the feel of the muscle - to determine if and which other muscles may need to be studied.
Nerve conduction velocity studies (NCVs) are used to test the speed of impulses through a nerve. To perform this study, surface electrodes are used to stimulate the nerve by placing electrodes on the skin at various locations over the nerve. One electrode stimulates the nerve with a mild electrical impulse and the resulting electrical activity is recorded by the other electrode. The distance between electrodes and the time it takes for electrical impulses to travel between electrodes are used to determine whether the nerve is functioning appropriately.