NCS is atest commonly used to evaluate the function of
the motor and sensory nerves of the human body.
Nerve conduction velocity (NCV) is a
common measurement made during this test.
Nerve Conduction Study (NCS)
5.
Some indications ofnerve conduction studies are:
—Symptoms indicative of nerve damage
as numbness, weakness.
—Differentiation between local or diffuse
disease process (mononeuropathy or
polyneuropathy).
—Get prognostic information on the type
and extent of nerve injury.
Nerve Conduction Study (NCS)
6.
Electrodes:
Skin will becleaned
Electrodes will be taped to the skin along the
nerves that are being studied
Stimulus:
Small stimulus is applied (electric current) by
stimulating electrode that activate nerves
Procedure
7.
The recording electrodeswill measure the
current that travels down the nerve pathway
The ground electrode stabilizes the electrical
circuit between the stimulating and recording
electrodes, your recordings may not be external
electrical signals.
The procedure takes about 30-90 minutes
Procedure
10.
If damaged?
If thenerve damaged, the recording will be slower and weaker
Complications
No reported complication from the procedure
expect feeling discomfort from electrical current, but not
painful
Description of Procedure
11.
When a nervefiber is degenerating, conductivity is
lost distal to the lesion within a few days, and this
give some indication of state of lesion and possible
prognosis.
Nerve Conductivity
12.
• With lesionin which degeneration does not
occur, it may be possible to determine the level at
which impulses are blocked by testing at different
points on nerve trunk.
Nerve Conductivity
13.
Nerve conduction velocity(NCV) is a
common measurement made during this test.
The speed with which an impulse is transmitted
along a nerve fiber and contract a muscle, This can be
measured with suitable equipment called
Electromyography.
Both tests help find the presence, location, and extent
of diseases that damage the nerves and muscles.
Conduction Speed
14.
The testis not invasive.
No contraindication to the procedure, but if there
is an artificial pacemaker, appropriate
precautions should be taken.
Anesthesia is not used for this
procedure.
No special post procedure precautions.
The test is sometimes combined with
Electromyography (EMG).
.
Important points about NCS
Median nerves (R& L) at;
index finger
thumb
Ulnar nerves (R & L) at;
little finger
ring finger
Recording site
19.
Peroneal nerves (R& L) at:
Dorsum of the foot, typically between the 1st and 2nd
metatarsals
Recording site
20.
Scott PM.Clayton’s electrotherapy and
actinotherapy. 9th ed. USA: Williams & Wilkins:
1980.
Singh J. Textbook of electrotherapy. 2nd ed. India:
Jaypee; 2012
REFERENCE BOOK
