Interferential Therapy.pptx

Interferential therapy is a form of treatment that involves the use of 2 medium frequency current to bring out the effect of a low frequency current in the tissues.
Skin impedance.
Principal of IFT.
Beat frequency.

1. Interferential therapy Name : - Shruti Kumari

2. Introduction It is a type of electrotherapy treatment that uses electric currents to stimulate tissue which provides pain relief, reduction of swelling and many other health benefits. The principle of interferential therapy is to cause two medium frequency currents of slightly different frequencies to interfere with one another. It is basically used for the treatment of Chronic, Post Traumatic, and Post-surgical pains. IFT uses a range of frequencies that stimulate the body to get positive reactions such as increasing the blood supply in an area which in turn increases the healing speed. The major advantage of IFT is that it produces effects in the tissue, exactly where required without unnecessary and uncomfortable skin stimulation. This technique is widely used to elicit muscle contraction, promote healing and reduce edema. IFT is the form of the electrical treatment in which two medium frequency currents are used to produce a low – frequency effect .

3. Skin impedance Interferential therapy Main problem of direct application of faradic or sinusoidal currents to patient is the very high skin impedance. Medium frequency current of around 4000Hz , while able to stimulate motor and sensory nerves, encounter a much Lower skin impedance . Impedance is inversely proportional to frequency. Formula of skin impedance : Z= 1/2 pfC where , Z = impedance in ohms f =frequency in hertz C= capacitance of skin in micro farads

4. Principles It is to pass two medium frequency alternating currents which are the slightly out of phase, through the tissue., where the currents intersect to produce a low frequency effect. Duration of treatment : Between 10 – 20 minutes. Mostly used 10 minutes

5. Electrodes placement for Interferential therapy : El or Interferential therapy use to for electrodes [ 2 pair electrodes ] Each pair indicated by the coloring wire form the machine. 2 electrodes = black and 2 electrodes = red . So in pair = 1 electrode black and 1 electrode red. The electrodes of each pair are placed diagonally opposite one another. So that beat frequency is produced in the tissue where it required. Testing of the Interferential therapy machine : First of all on the plinth placed 4 electrode in positing of electrode. After that put the hand on center of the electrodes. Then increase to intensity and feel to current.

6. Technique of treatment of Interferential therapy Patient position = comfortable . Skin = washed and apply petroleum jelly on the lesions . After that place the electrode on the site of treatment . Instruct to patient if feel a tingling sensation please tell to therapist . On that time decrease the intensity . Beat frequency of Interferential therapy When to apply Interferential therapy two frequency current is used. If one of the currents is kept in constant of 4000 Hz and other can be varied between 3900 and 4000 Hz And interference effect at the called beat frequency. Beat frequency is equal to difference in frequency between the two currents. It is produce in the tissue at the point where the two current cross.

7. Dosage of Interferential therapy : : For pain relief = 80 – 100 Hz For reduce swelling = 1 – 10 Hz Reduce edema = 100 Hz For partial tetany contraction = 5 – 20 Hz For tetany contraction = 30 – 100 Hz Apply for 15 minutes

8. Physiological effect of Interferential therapy Indication Contraindication Pain relief Motor stimulation Absorption of exudate Increase the local blood flow Reduction of edema Rheumatoid arthritis. Frozen shoulder. Disc herniation. Spinal canal stenosis. Reduction of Edema Muscle injuries Ligaments injuries Stress incontinence Cervical spondylosis. Osteoarthritis of the knee. Infective condition Malignancy Pacemakers Loss of sensation. Large open wounds Dermatological Conditions Pregnant Uterus Hypertension Thrombosis Hemorrhage Neoplasm Tb Fever

9. Thank you