Which of the following is a listed precaution when using superficial thermal agents?

• A. Diminished sensation
• B. Increased muscle strength
• C. High venous return
• D. Excellent circulation

Answer: (B)

Precautions when using superficial thermal agents center on avoiding tissue injury by heat. Diminished sensation is a key precaution because reduced ability to feel temperature means the skin can overheat and burn before the patient notices. With diminished sensation, you must lower the temperature, shorten the exposure time, and frequently check the skin or use a barrier to protect the area.

Increasing muscle strength is a beneficial therapeutic goal, not a precaution related to heat application. Similarly, high venous return and excellent circulation describe favorable blood flow states and do not inherently indicate a safety concern specific to superficial heating.