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EXPLANATION
✔Correct answer:
Reflex vasoconstriction will take place. When heat therapy, such as an aquathermia pad, is applied to an area for too long (generally more than 20 to 30 minutes), reflex vasoconstriction can occur. Initially, the application of heat causes vasodilation (widening of blood vessels) to improve blood flow and promote healing. However, after a prolonged period, the body initiates reflex vasoconstriction as a protective mechanism to prevent tissue damage from excessive heat exposure. This response reduces blood flow and can limit the benefits of the heat application, which is why heat therapy is typically recommended to be limited to 20 to 30 minutes.
Heat is used to relax muscles, reduce stiffness, and promote healing by increasing blood flow to the injured area. However, if the heat is applied for too long, the body reacts to protect tissues from potential damage, and vasoconstriction occurs, negating the positive effects of heat therapy. Therefore, limiting the time of application is essential for effective and safe treatment.
Think of heat therapy like warming up your hands by a fire. Initially, it feels great and warms you up, but if you keep your hands too close to the fire for too long, they can get too hot, causing discomfort. The body does something similar with heat therapy by reducing blood flow to protect against overheating after a while.
When applying heat therapy like an aquathermia pad, Nurse Lee should:
- Monitor the client during the treatment to ensure the pad is applied correctly and that the skin is not becoming too hot or damaged.
- Explain to the patient the need to remove the pad after 20 to 30 minutes to prevent reflex vasoconstriction and ensure the therapy is effective.
- Assess the client’s skin before and after the application for any signs of adverse reactions, such as burns, redness, or discomfort.
- Encourage the patient to report any unusual sensations, such as excessive heat or pain during the treatment.
✘Incorrect answer options:
Reflex vasodilation will take place. Reflex vasodilation occurs during the initial application of heat, but prolonged heat application results in reflex vasoconstriction, which is the body's protective response to prevent tissue damage from excessive heat exposure.
A systemic response will occur. Heat therapy applied locally, such as with an aquathermia pad, usually results in a local response, not a systemic one. Systemic responses typically involve the entire body, whereas this type of therapy primarily affects the area where heat is applied.
A local response will occur. While a local response is correct in terms of the direct effects of the heat, the timing of removing the pad is specifically due to reflex vasoconstriction, which limits the effectiveness of the heat after a prolonged period. The question asks for the reason behind the timing, which relates to the vasoconstriction rather than the broader local response.
References
- Perry, A. G., Potter, P. A., & Ostendorf, W. R. (2017). Clinical Nursing Skills and Techniques (9th ed.). Elsevier.
- Taylor, C. R., Lillis, C., LeMone, P., & Lynn, P. (2018). Fundamentals of Nursing: The Art and Science of Person-Centered Care (9th ed.). Wolters Kluwer.