Passive Care- Exam 1- Interferential Current

What type of currents penetrate deeper?

Medium frequency

What frequency does Interferential current (IFC) use?

3000-5000 Hz

IFC uses how many channels and how many electrodes

2 channels

4 electrodes

How must you apply the electrodes for IFC

Crisscross pattern

Treatment frequency is based on?

Type of pain

(Acute, subacute, chronic)

What produces the treatment frequency in IFC

Interference of the 2 currents in the body

What is it when two sinusoidal waves that are exactly in phase combine, and supplement each other?

Constructive interference

The combined current of constructive interferences has __________ the amplitude but ____________ frequency

2x amplitude

Same frequency

What is it when two sinusoidal waves are exactly out of phase with each other and results in cancellation of both waves?

Destructive interference

What is the combination of constructive and destructive interference?

Heterodyne

What type of wave results from a heterodyne interference?

Wave with a beat effect

How can you predict the beats in the combined wave of a heterodyne interference?

Difference of the 2 wave frequencies

What kind of interference does IFC use?

Heterodyne

What is the frequency we use for acute pain?

80-150 Hz

What is the frequency we use for chronic pain?

1-15 Hz

What is it when there is 2 channels (4 electrodes) and they are applied quadripolar?

True Interferential

During true Interferential, the electrodes are applied in ____________ fashion, and this creates a _____________ patterned treatment area

Crisscross (diagonal)

Cloverleaf

It is most intense where during true Interferential current?

Where currents cross

What does it mean when some machines can use "Target" during true Interferential current?

Reduce inaccurate of therapy by targeting the painful tissues

(Move the clover leaf pattern around)

What is the same as IF but the interference occurs in the machine, not the body?

Premodulated current

What type of current is good for small treatment areas?

Premodulated current

Premodulated current uses how many electrodes?

2

What allows for effective pain control with 2 electrodes?

Premodulated current

What is it when there is a mix of channels that occurs in the generator instead of tissues and does not penetrate deeply but is more accurate?

Bipolar electrode placement

Bipolar electrode placement is good for what?

One muscle or muscle group

Vector can must be used with?

True Interferential current

What is it when the cloverleaf pattern rotates during true Interferential current?

Vector scan

What allows for a larger treatment area during true Interferential current?

Vector scan

How does vector scan work and allow the cloverleaf pattern to rotate?

Varies the amplitude between the channels

What is the 3D interference pattern?

Stereodynamic (3 channels, 6 electrodes)

What do we use IFC for?

Pain reduction (main thing)

Muscle strengthening

Where especially do we use IFC for muscle strengthening?

Pelvic floor in women with post-partum incompetence

What are the 12 contraindications to IFC use

1. Anterior cervical area

2. Through head

3. Through chest

4. Pacemakers, and implantable cardioverter- defribilator (ICD)

5. Abdomen, pelvis, lumbar areas of pregnant women in 1st tri

6. Metal implants

7. Epilepsy

8. Areas of hemorrhage

9. Cancer

10. Confused and unreliable patients

11. Damaged skin

12. Unknown etiology

What are the risks of IFC

Skin irritation

Diathermy devices must be 10 ft (3m) away

What is the frequency for subacute pain IFC treatment?

1-150 Hz

What is the treatment time for IFC

15-20 minutes

How do you determine the amplitude of IFC

Patient comfort (turn it up just below its uncomfortable)

What fibers are targeted with IFC when patient feel tingling

A- beta fibers

What fibers are targets with IFC when muscles twitch

Alpha motor neurons

What is the frequency we use for IFC strength?

40-60 Hz

(WE USE 50 Hz)

How many electrodes do we use for IFC strength use?

Bipolar electrodes (2 electrodes)

What is the duty cycle for IFC strength use?

10:50

(10 sec on and 50 sec off)

What is it when the amplitude eases into the max contraction during IFC strength use?

Ramp Time