Which modality can result in a galvanic rash?

Which modality can result in a galvanic rash?

• A. Iontophoresis
• B. Ultrasound
• C. Electrical stimulation
• D. Cryotherapy

Answer: (A)

Galvanic rash is a localized dermatitis caused by electrochemical reactions at the electrode–skin interface when direct current is used. Iontophoresis uses direct current to drive medication ions through the skin, and the combination of electrode materials, the conductive gel, and the skin can produce these electrochemical reactions, leading to a galvanic rash. The other modalities do not rely on a sustained direct current at the skin in the same way: ultrasound delivers mechanical energy, cryotherapy applies cold, and electrical stimulation typically uses pulsed or alternating currents that minimize continuous electrochemical interaction at the surface. So, iontophoresis is the modality most associated with this skin reaction.

Galvanic rash is a localized dermatitis caused by electrochemical reactions at the electrode–skin interface when direct current is used. Iontophoresis uses direct current to drive medication ions through the skin, and the combination of electrode materials, the conductive gel, and the skin can produce these electrochemical reactions, leading to a galvanic rash. The other modalities do not rely on a sustained direct current at the skin in the same way: ultrasound delivers mechanical energy, cryotherapy applies cold, and electrical stimulation typically uses pulsed or alternating currents that minimize continuous electrochemical interaction at the surface. So, iontophoresis is the modality most associated with this skin reaction.