|
A Transcutaneous
Electrical Nerve Stimulator, more commonly referred to as a TENS unit
and pronounced tens, is an electronic device that produces electrical
signals used to stimulate nerves through unbroken skin. It is usually
applied to the skin using two or more electrodes. The electrical
current that is produced is very mild, but it can prevent pain messages from
being transmitted to the brain. Pain relief can last for several hours. Some
people may use a small, portable TENS unit that hooks onto a belt for more
continuous relief. TENS machines should only be used under the supervision
of a physician or physical therapist. A typical
battery-operated TENS unit consists of a pulse generator, small transformer,
frequency and intensity controls, and a set of electrode wires.
Uses
TENS is considered a method of pain relief, and has a wide following
for use in obstetric care particularly labour. Nevertheless, there is little
data on its actual efficacy, and many obstetricians maintain that it is
ineffective. TENS machine can be purchased or rented from hospital
supply or surgical supply houses; however, a prescription is necessary for
insurance reimbursement.
In palliative care and pain medicine, TENS is occasionally attempted
for neuropathic pain (pain due to nerve compression). Although
results are modest, some patients benefit from this approach. To generate
more conductivity from the electrode to the skin a cream should be used. The
position of the electrodes on your skin can alter which muscle is
stimulated.
-
TENS seems to have two effects:
1- TENS selectively stimulates certain
"non-pain" nerve fibers possibly sending signals to the brain
blocking other nerve signals carrying pain messages. Only the non-pain
messages get through to the brain.
2- TENS seems to stimulate the
production of endorphins, which are natural pain-relieving hormones
produced by the body.
Safety
Unlike many pain relieving drugs, Tens is not addictive and seems to
have few side effects. Electrodes should never be
placed near or on the eyes, neck, or on an open wound or cut. If placed on
an open wound, the veins in your body will serve as wires sending a
mircoshock directly to your heart, sending you into ventricular
fibrillation. Also a TENS unit should not be used if you have a pacemaker in
you, as it will interfere with the electrical structures on the pacemaker.
|
