Besides TENS and NMES, which modalities are commonly used in electrotherapy in the US?

• A. Interferential therapy (IFT), HVPC, iontophoresis, and microcurrent therapy
• B. Ultrasound therapy and iontophoresis
• C. Laser therapy and diathermy
• D. Pharmacologic therapies only

Answer: (A)

In electrotherapy practice in the US, besides TENS and NMES, several modalities are commonly used: interferential therapy, high‑voltage pulsed current (HVPC), iontophoresis, and microcurrent therapy. Interferential therapy uses two medium‑frequency currents that intersect to create a low-frequency beat inside the tissues, allowing deeper tissue effects with less skin irritation for pain relief and edema reduction. HVPC delivers a high‑voltage, pulsed, monophasic current that can promote tissue healing and reduce edema and pain, often used for wound or soft tissue issues. Iontophoresis applies a direct current to drive charged medications through the skin, enabling localized anti‑inflammatory or analgesic effects without systemic exposure. Microcurrent therapy uses very small amplitudes that approximate the body’s own electrical signals, aiming to enhance cellular activity and tissue repair.

The other options mix modalities that aren’t electrical stimulation in the same sense (like ultrasound) or include non‑electrical approaches (laser therapy, diathermy) or non‑therapeutic categories (pharmacologic therapies), so they don’t fit the question as the commonly used electrotherapy modalities alongside TENS and NMES.