Electromyography (EMG) and nerve conduction studies (NCS)
are tests that evaluate and measure muscle and nerve function.
These two tests are performed together, EMG usually follows
the NCS.
NCS is performed by mild electrical currents applied to the
skin overlying the particular nerve that is being tested. A response is recorded
from the corresponding muscle. This is done to measure how fast the electrical
impulse travels between the examining points. EMG assesses the muscles function
as well as gives information regarding the health of the nerves which control that
particular muscle. To do this a fine needle is inserted into the muscle this
needle then sends information to the recording device. No electrical currents
are applied with the needle. These needles are specially designed to carry the
electrical information back to the instrument, they are disposable and Teflon coated.
There is minimal pain upon insertion into the skin and the muscle.
During the test wave forms appear on the screen. Measurements
will be performed over the areas of test and transmitted to a computer which is
incorporated in the instrument. These measurements and the wave forms and their
shapes will help to determine the test results and the condition of the nerves
and the muscles that have been tested.
Prepare for the test as instructed. Shower or bathe before
the test. Avoid applying oil, cream, or lotion. You skin must be clean and free
of oil. Beware that you may be asked to change into a hospital gown. Let the
technician and the doctor know if you are taking any blood thinners, especially
coumadin, have any bleeding conditions or any immune system disorder including HIV
and AIDS. This is both for your protection as well as the technician and your
doctor.
The entire test will take about one hour.
 |
 |
