Module 11: Powerpoint 2: IFC

What are the primary clinical purposes of IFC?

Interferential Current Therapy (IFC) is used to achieve pain reduction, edema reduction, and reduction of muscle guarding. It is selected when deeper tissue penetration and improved patient comfort are desired compared to other forms of electrical stimulation.

How does frequency affect skin resistance in IFC?

At low frequencies such as 50 pps, skin resistance is high (approximately 3,200 ohms). At high frequencies such as 4,000 pps, skin resistance drops significantly (approximately 40 ohms), allowing current to pass more easily into deeper tissues.

What is interferential current therapy?

IFC is the simultaneous application of two separate sinusoidal alternating currents with carrier frequencies above 1,000 pps delivered to the same treatment area. The interaction of these currents within the tissues produces a therapeutic beat frequency.

What produces the beat frequency in IFC?

The beat frequency is produced by the difference between the two carrier frequencies where they intersect in the tissues. This beat frequency is responsible for the physiological effects of IFC.

What produces the beat frequency in IFC?

The beat frequency is produced by the difference between the two carrier frequencies where they intersect in the tissues. This beat frequency is responsible for the physiological effects of IFC.

What does 'setting the difference' mean clinically?

The difference' refers to the beat frequency created where the two current pathways intersect. The clinician selects parameters based on treatment goals, while the actual interaction occurs invisibly within the tissues.

Why must IFC electrodes be crossed?

Two channels must be crossed to allow the currents to intersect within the body, creating the therapeutic interferential field. Without crossing, the beat frequency will not be produced.

How does tissue resistance influence IFC current flow?

Current follows the path of least resistance, traveling preferentially through tissues with higher conductivity. Body contours and electrode placement influence where the currents intersect.

What are 'windows' in IFC application?

'Windows' are areas of decreased skin resistance, such as acupuncture points, motor points, and trigger points, which allow easier current penetration compared to areas of higher resistance.

What is meant by the 'third line' of current in IFC?

The third line refers to the vector field created by the interaction of the two applied currents within the body. This is where the therapeutic effects of IFC occur.

Why is modulation used with IFC?

Modulation helps prevent accommodation by varying parameters such as frequency, intensity, or vector movement. Patient comfort ultimately determines appropriate modulation settings.

What modulation options are commonly available with IFC?

Common modulation options include sweep, scan, and vector modulation, which alter how the interferential field moves or changes within the tissues.