During electrotherapy, which sign should prompt re-evaluation of placement and parameters?

• A. Gentle tingling without skin irritation.
• B. Comfortable warmth with no redness.
• C. Skin redness and a burning sensation under the electrode.
• D. No sensation at all.

Answer: (C)

Redness with a burning sensation under an electrode is a warning sign that the current density is too high or that contact is inadequate, risking skin damage. This signals you must re-check electrode placement and adjust the settings or setup. Take steps like inspecting the skin, ensuring good contact with appropriate conductive gel, and either lowering the current or shortening duration, or using a larger electrode to spread the current more evenly. You might also reposition the electrodes to avoid sensitive areas and verify connections and impedance before continuing. Mild tingling or comfortable warmth without irritation typically reflects safe, acceptable stimulation, while no sensation can indicate poor contact rather than a problem with safety, so the burning/redness finding is the clear trigger to re-evaluate.