A nurse is teaching a client about skin cancer prevention. Which of the following statements by the client indicates an understanding of the teaching?

• Urticaria: Urticaria (hives) is a hallmark sign of an allergic reaction, particularly latex allergy, and typically appears quickly following exposure to allergens. It is not seen in malignant hyperthermia or hypovolemic shock.
• Wheezing: Wheezing can occur in latex allergy due to bronchospasm or airway edema. While respiratory compromise may happen in malignant hyperthermia, it is typically due to muscle breakdown and CO2 retention, not bronchospasm. Wheezing is not expected in hypovolemic shock.
• Muscle rigidity: Generalized rigidity, especially of the jaw (masseter spasm), is a key early sign of malignant hyperthermia, a life-threatening reaction to certain anesthetics. It is not a symptom of latex allergy or hypovolemic shock.
• Hypercapnia: An elevated PaCO₂ is an early, sensitive marker of malignant hyperthermia, resulting from increased CO₂ production due to sustained muscle contraction. This does not occur in latex allergy or hypovolemic shock.
• Tachycardia: Elevated heart rate can be seen in all three conditions: in malignant hyperthermia due to increased metabolic demand, in latex allergy due to anaphylactic reaction, and in hypovolemic shock as a compensatory response to fluid loss.

A. Choose a vein that is palpable and straight. A palpable, straight vein provides the best access for successful IV catheter insertion. It allows for easier threading of the catheter and reduces the risk of complications like infiltration.
B. Select a site on the client's dominant arm. The non-dominant arm is usually preferred to minimize interference with daily activities and reduce the risk of dislodgement due to frequent use.
C. Elevate the client's arm prior to insertion. Elevating the arm can decrease venous filling, making veins less prominent and harder to access. Instead, the arm should be placed in a dependent position to promote vein distention.
D. Apply a tourniquet below the venipuncture site. The tourniquet should always be placed above the insertion site to restrict venous return and make the veins more prominent and easier to access.