Faradic Current

Faradic current is a type of electrical current used in medical and therapeutic applications, particularly in Physiotherapy for muscle stimulation and rehabilitation. It is a short duration interrupted direct current having pulse duration between 0.1 to 1 ms with a frequency of 50 to 100 Hz. Faradic current is classified as unmodified and modified. The modified current is surged which contract and relax muscle i.e. it act like a pump.

 

Factors to consider while using Faradic Current

• Duration of current
• Patients comfort level
• Waveform used
• Interval between each impulse

 

Role of Faradic Current in Certain Conditions 

• Low frequency currents that include faradic stimulation as well as transcutaneous electrical nerve stimulation, is used in Bell’s Palsy and have also shown improvements. Its application depends upon severity of its symptoms. It is usually applied especially in the early stages. Effective results are achieved when applied immediately after paralysis. The physiotherapist can also incorporate exercises, merging them with PNF techniques for better results. Feedback exercises also proves beneficial in improving facial muscle symmetry.
• Faradic stimulation can also be used to treat upper trapezius strain that results as a result of overuse activity mostly.  Individual presents with restricted passive range of motion and spasm of antagonist muscles. The physiotherapist can feel palpable tender spots in the upper trapezius. Contra-indications include dermatitis, shoulder pathology, clotting disorder, open wound or degenerative cervical spine. Faradic stimulations aids in reducing pain and improving ROM.
• Faradic stimulation is sometimes used to treat psychogenic disorders like Functional Aphonia which is caused by psychosocial stressor. The stimulation is given superficially on the patient's throat on either side of the thyroid cartilage for about 10 min. Physiotherapist ask the patient to voluntarily attempt vocalization when stimulation is given. Presence of any cardiac comorbidity should be taken into consideration.
• Knee Osteoarthritis is a common condition nowadays, faradic stimulation provides effective results. Physiotherapist can incorporate quadriceps isometrics to reduce pain, stiffness and overcome an functional limitations. Faradic stimulation improves the quadriceps strength.

 

 Physiologic Effect

• Sensory Nerve stimulation
• Motor Nerve stimulation
• Improved Lymphatic Drainage
• It can cause Electrolyte Imbalance
• Not appropriate for Denervated Nerve supply

 

Indications

• Induce Muscle Contraction
• Re-educate muscle action
• Develop a new muscle action
• Improve Lymphatic Drainage
• Neuropraxia i.e. Peripheral Nerve Injury
• Prevent Adhesion Formation