What type of electrical current is used in TENS therapy?

• A. Monophasic
• B. Biphasic
• C. Direct Current
• D. Pulsed Direct Current

Answer: (B)

TENS therapy, or Transcutaneous Electrical Nerve Stimulation, primarily utilizes a biphasic electrical current. This type of current involves alternating phases of positive and negative polarity, which helps in managing pain by stimulating sensory nerves. The biphasic waveform is effective because it reduces the risk of skin irritation and promotes a more comfortable experience for the patient during treatment.

The nature of biphasic current allows for the modulation of the frequency and pulse width, which can be adjusted based on the individual needs of the patient and the type of pain being treated. This flexibility is crucial for achieving the desired analgesic effect. Additionally, because the current alternates directions, it can effectively stimulate nerve fibers without causing damage or discomfort associated with unidirectional current types.

Understanding the characteristics of biphasic current and its application in TENS therapy is vital for healthcare professionals, as it directly impacts the efficacy of pain management strategies.