Pain Control - IFC & Premod Flashcards
interferential therapy can produce what effects
muscle stimulation
edema reduction
muscle spasm reduction
pain reduction
explain edema reduction via interferential therapy
can stimulate muscle pump
can stimulate vasculature - change vasomotor tone and pressure differences
prerequisites associated with interferential current therapy
medium frequency = 1000-10k Hz
2 independent current generators
alternating current
what is beat frequency
when 2 currents cross in the tissue, interference between them forms a frequency that extends into deeper tissue
relationship between skin resistance and frequency
skin resistance will decrease as frequency increases
what is the mathematical definition of beat frequency
difference between 2 frequencies
2nd channel - 1st channel = beat frequency
what frequencies are necessary for interferential currents to occur
1st channel has to be 4000 Hz
2nd channel can be anywhere from 4001-4150 Hz
explain widensky inhibition
basically why the beat frequency occurs
an uninterrupted frequency (difference between channels) is created between the corresponding electrodes and is then used therapeutic
what value corresponds with lower frequency IFC
40-60 Hz
- smooth muscle contraction in normally innervated muscles
therapeutic effects associated with low frequency IFC
edema reduction
muscle spasm reduction
muscle strengthening
value associated with high frequency IFC
80-150 Hz - pain control
explain frequency and time of healing associated with high frequency IFC
acute = 130-150 Hz
sub to chronic = 80-120 Hz
explain SWEEP
lessening of accommodation via channel 2 sweeping between a preselected range of frequency
how much change in frequency is noted during SWEEP
(+/-) 20%
explain electrode placement in IFC
has to be quadripolar so that there is a crossing and interference between signals
compare IFC and TENS
IFC = deeper tissue can be treated / greater treatment areas
explain static position IFC
interference current will be drawn more near to stronger current (from either channel)
what mode is used to move or rotate interference within tissue
VECTOR
what are under the umbrella of VECTOR mode
20, 50, 100%
- each corresponding to how much of the area between the quadripolar electrodes will receive current
explain premodulation
taking carrier frequency and distributing it into predetermined bursts per second without changing carrier frequency
explain the channel(s) and thier roles in pre-modulation? why is this important?
both channels will produce a carrier frequency of 4000 Hz
- beat frequency will be the same as the pre-modulated frequency
WILL DECREASE TISSUE RESISTANCE
what electrode set up is related to pre-modulation
can be:
monopolar
bipoolar
quadripolar
advantages of IFC and Pre-Mod
low impedance across skin
stimulate PSNS for vasculature
deeper penetration that is more comfortable
pain relief
considerations for IFC
not as abundant/available as TENS
- insurance is more difficult
