Which of the following is a sensitive area to avoid with electrotherapy?

• A. Forehead
• B. Abdomen
• C. Carotid sinus
• D. Ankle

Answer: (C)

Stimulation near the carotid sinus is avoided because that area contains baroreceptors that help regulate blood pressure. When electrical current is applied there, it can trigger a reflex through the glossopharyngeal nerve to the brainstem, leading to increased parasympathetic output via the vagus nerve and decreased sympathetic activity. The result can be a sudden drop in heart rate and blood pressure, causing dizziness, fainting, or even arrhythmias. For this reason, the anterior neck region over the carotid sinus is a contraindicated site for electrotherapy.

Areas like the forehead, abdomen, or ankle don’t carry the same risk of provoking that autonomic reflex, so they’re generally acceptable sites when placing electrodes, assuming no other contraindications.