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EMG/ Nerve conduction

NERVE CONDUCTION STUDY.

What is a nerve conduction velocity test?

A nerve conduction velocity (NCV) test — also called a nerve conduction study (NCS) — measures how fast an electrical impulse moves through your nerve. NCV can identify nerve damage.

During the test, your nerve is stimulated, usually with electrode patches attached to your skin. Two electrodes are placed on the skin over your nerve. One electrode stimulates your nerve with a very mild electrical impulse. The other electrode records it. The resulting electrical activity is recorded by another electrode. This is repeated for each nerve being tested.

The speed is then calculated by measuring the distance between electrodes and the time it takes for electrical impulses to travel between electrodes.

 

A related test that may be done is an electromyography (EMG). This measures the electrical activity in your muscles. It is often done at the same time as an NCV. Both tests help find the presence, location, and extent of diseases that damage the nerves and muscles.

Why might I need a nerve conduction velocity test?

NCV is often used along with an EMG to tell the difference between a nerve disorder and a muscle disorder. NCV detects a problem with the nerve, whereas an EMG detects whether the muscle is working properly in response to the nerve’s stimulus.

 

Diseases or conditions that may be checked with NCV include:

  • Guillain-Barré syndrome. A condition in which the body’s immune system attacks part of the peripheral nervous system. The first symptoms may include weakness or a tingling sensation in the legs.
  • Carpal tunnel syndrome. A condition in which the median nerve, which runs from the forearm into the hand, becomes pressed or squeezed at the wrist by enlarged tendons or ligaments. This causes pain and numbness in the fingers.
  • Charcot-Marie-Tooth disease. An inherited neurological condition that affects both the motor and sensory nerves. It causes weakness of the foot and lower leg muscles.
  • Herniated disk disease. This condition occurs when the fibrous cartilage that surrounds the disks of your vertebrae breaks down. The center of each disk, which contains a gelatinous substance, is forced outward. This places pressure on a spinal nerve and causes pain and damage to the nerve.
  • Chronic inflammatory polyneuropathy and neuropathy. These are conditions resulting from diabetes or alcoholism. Symptoms may include numbness or tingling in a single nerve or many nerves at the same time.
  • Sciatic nerve problems. There are many causes of sciatic nerve problems. The most common is a bulging or ruptured spinal disk that presses against the roots of the nerve leading to the sciatic nerve. Pain, tingling, or numbness often result.

 

Nerve conduction studies may also be done to find the cause of symptoms, such as numbness, tingling, and continuous pain.

Other conditions may prompt your healthcare provider to recommend NCV.

What are the risks of NCV tests?

The voltage of the electrical pulses used during an NCV is considered very low.

 

Risks depend on your specific medical condition. Be sure to discuss any concerns with your healthcare provider before the procedure.

 

Certain factors or conditions may interfere with the results of NCV tests. This includes damage to the spinal cord, severe pain before the test, and body temperature.

 

Tell your healthcare provider if you have a cardiac defibrillator or pacemaker, as precautions may need to be taken.

How do I get ready for an NCV test?

  • Your healthcare provider will explain the procedure and you can ask questions.
  • You will be asked to sign a consent form that gives your permission to do the procedure. Read the form carefully and ask questions if something is not clear.
  • Generally, you will not need to fast or get sedation before the procedure.
  • Normal body temperature must be maintained before and during the procedure, as low body temperature slows nerve conduction.
  • Tell your healthcare provider of all medicines (prescription and over-the-counter) and herbal supplements that you take.
  • Dress in clothes that allow access to the area to be tested or that are easily removed.
  • Stop using lotions or oils on your skin for a few days before your procedure.
  • Based on your medical condition, your healthcare provider may request other preparation.

Providers

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DR. ABDUL SOFI MD
Pediatry Doctor

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RANDY HEARNE ARNP
Pediatry Doctor

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LAURA SMITH ARNP
Dentist

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AMY BEACH ARNP
Dentist

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SHARON SCHLICK. PA.
Surgeon

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Contacts

Phone no. 8505843278

Fax no. 850 584 8171