IFC Flashcards
What is a “carrier frequency” in IFC?
The unmodulated alternating current that is modulated into a therapeutic current when it interferes with another carrier frequency.
What is a “beat frequency” in IFC?
The therapeutic current produced by interfering two independent carrier frequencies; the difference between the two carrier frequencies.
Give an example of how beat frequency is calculated.
If Carrier Frequency 1 is 4000 Hz and the Beat Frequency is 100 Hz, then Carrier Frequency 2 is 4100 Hz (4100 Hz - 4000 Hz = 100 Hz)
What are typical carrier frequencies for acute IFC?
4,000 or 5,000 Hz.
What are typical beat frequencies for acute IFC?
100 to 150 Hz
What are typical carrier frequencies for chronic (low-rate) IFC?
2500 Hz
What are typical beat frequencies for chronic (low-rate) IFC?
2-10 Hz.
Why are modulations used in IFC?
to avoid sensory habituation and allow for effective treatment at lower intensities.
What is “sweep” in IFC?
Rate (frequency) modulation
What is “scan” in IFC?
Amplitude modulation.
What is the goal of amplitude in IFC for acute pain?
Strong sensory sensation; muscle contraction may be elicited, but is not the goal
How long does pain relief typically last with IFC for acute pain?
Only while the stimulation is active and possibly shortly after.
What is the mechanism of pain relief for acute pain with IFC?
Dorsal horn gate theory
How is pre-modulated IFC produced?
Two un-modulated alternating currents are mixed inside the stimulator, and the resulting beat frequency is delivered to the patient.
What is the goal of amplitude for IFC used to treat chronic pain?
Strong to “sharp” sensory sensation, with notable muscle contraction.
How long does pain relief typically last with IFC for chronic pain?
3-4 hours post-treatment.
What is the mechanism of pain relief for chronic pain with IFC?
Endogenous opioid-like factor release.
