faradic current.pptx about the medical physics

Faradic current
Type of the low frequency current

1. Electrotherapy The use of electric currents passed through the body to stimulate nerves and muscles, chiefly in the treatment of various forms of paralysis . Physical therapists can use electric therapy in a wide range of services. Examples include interferential therapy, therapeutic ultrasounds, EMS therapy, PENS therapy, and TENS therapy .

2. Low Frequency Currents Those currents Whose frequency is less than 1000Hz Primary use is to stimulate nerves and muscles Various currents in this category are used for physiotherapeutic treatment Faradic Current Galvanic Current Sinusoidal Current Diadynamic Current TENS Super imposed Current

3. Faradic Current Short duration of interrupted direct current with pulse duration of 0.1 to 1 ms and the frequency of 30 to 100 Hz Previously known as un evenly AC of two unequal phases It is also known as asymmetric alternating current and short duration interrupted direct current (IDC)

4. Principle Same like a interrupted direct current Modification These currents are always surged for treatment purpose to produce a near normal tetanic like contraction and relaxation of muscle Current is surged at variable controlled speed ranging from 30 to 40 surges/min with varying rest period Surging of Faradic Current Trapezoidal Surging Impulse increases slowly, maintained there for sometime and decreases gradually forming trapezoidal shape

5. Triangular Surging Impulse increases and decreases gradually forming triangular shape Saw-tooth Impulses increases gradually but suddenly falls Rectangular Impulses increases rapidly, maintained there for sometime and falls abruptly Physiological Effects Stimulation of sensory nerves Stimulation of motor nerves Reduction of swelling and pain Not stimulate the Denervated muscles Increases joint mobility Increases lymphatic activity Helps in healing Analgesic effect Does not produce chemical burn until high intensity is used Cases vasodilatation in turn increases circulation

6. Therapeutic Effects Reduces edema Controls acute and chronic pain Reduces and inhibits muscle spasm Reduces joint contracture Minimize atrophy Facilitates tissue healing Facilitates muscle re-education Facilitates fracture healing Strengthen muscles

7. Indications Facilitation of muscle contraction inhibited by pain Muscle re-education Training of muscle Nerve damage Improvement of venous and lymphatic drainage Prevention and loosing of Adhesion Painful knee syndrome

8. Contraindications Skin lesions Infections Inflammation Thrombosis Marked loss of sensation Tuberculosis or cancer Cardiac Pacemaker Skin diseases Unreliable patient Superficial metal