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N C S / E M G
Impulses inspect your nerves to check for any "roadblocks"
Pin electrodes go into your muscles and read what your muscles are "saying"
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A Nerve Conduction Study (NCS), a precursor to an EMG, uses electrode stickers applied to the skin (surface electrodes) to measure the speed and strength of signals traveling between two or more points.
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Electromyography (EMG) is a routine diagnostic procedure to assess the health of muscles and the nerve cells that control them (motor neurons). EMG results can reveal nerve dysfunction, muscle dysfunction or problems with nerve-to-muscle signal transmission. Motor neurons transmit electrical signals that cause muscles to contract.
An EMG uses a thin, pin electrode inserted directly into a muscle to record the electrical activity and behavior. Using specialized software, these signals are translated into sounds, numerical values, and graphs that are then interpreted by a specialist.
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Why is it Done?
Your doctor may order an EMG if you have signs or symptoms that may indicate a nerve or muscle disorder. Such symptoms may include:
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Tingling
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Numbness
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Muscle weakness
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Muscle pain or cramping
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Certain types of limb pain
EMG results are often necessary to help diagnose or rule out a number of conditions such as:
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Muscle disorders, such as muscular dystrophy or polymyositis
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Diseases affecting the connection between the nerve and the muscle, such as myasthenia gravis
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Disorders of nerves outside the spinal cord (peripheral nerves), such as carpal tunnel syndrome or peripheral neuropathies
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Disorders that affect the motor neurons in the brain or spinal cord, such as amyotrophic lateral sclerosis or polio
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Disorders that affect the nerve root, such as a herniated disk in the spine