TENS Flashcards
What is the rationale behind TENS?
Introduces a new sensation that travels faster than pain signals - pain nerve fibres are slower than sensory
Faster light touch sensations from TENS blocks pain signals
Masking pain may allow patients to temporarily regain movement
What are the physiological effects of TENS
Pain relief
What are the physiological effects of high TENS?
High frequency, low intensity, lots of short stimuli block pain signals
What are the physiological effects of low TENS?
Low frequency, High pulse width & intensity, stabbing sensation acts as a noxious stimulus so body releases pain relieving chemicals
What structures does TENS affect?
Sensory receptors in area of application
How would you apply TENS?
1) Introduce
2) Explain procedure & benefits for informed consent
3) Check area visually and ask about contraindications
4) Perform a pin prick test.
5) Place electrode either side of the area to be treated.
6) Attach the leads to the machine.
7) Set the desired frequency and pulse rate.
8) Turn up the intensity as much as the patient can comfortably tolerate.
9) Start the timer.
10) At the end of time turn the machine off
and remove the electrodes, checking the skin for any signs of
Adverse reactions.
11) Patient may have to be taught how to
apply and use the machine as TENS is
frequently given for home use.
What are the parameters for high TENS?
FQ= 150hz
Pulse w= 50-80us
Duration = up to 8hrs
Intensity = pins & needles
What are the parameters for low TENS
FQ= 1-4hz
Pulse w= 200us
Duration = up to 30-40mins
Intensity = very strong
Who cannot be treated with TENS?
People with:
Pacemakers
Heart disease or dysrhythmias
Undiagnosed pain
Epilepsy
In the first three months of pregnancy
Where should TENS not be used?
The mouth
The carotid sinus
Broken skin
Anaesthetic skin
The abdomen during pregnancy
Near the eyes
