Correct Answer: A

Rationale: The most crucial nursing action when assisting an older adult client with a tub bath is to check the bath water temperature. This step is essential to prevent burns from hot water or chilling from water that is too cold. Ensuring the water temperature is safe is a critical aspect of promoting the client's safety and comfort during the bathing process.

Correct Answer: D

Rationale: Central venous pressure (CVP) monitoring is the most effective method to assess fluid status and the cardiovascular system in a client with severe burns. Severe burns can lead to significant fluid shifts and hemodynamic changes, making central venous pressure monitoring crucial for guiding fluid resuscitation and managing cardiovascular stability in these patients.

Correct Answer: D

Rationale: The symptoms of fatigue, muscle weakness, leg cramps, and cardiac dysrhythmias are classic manifestations of hypokalemia. Potassium plays a vital role in muscle function and cardiac conduction, so a deficiency can lead to these symptoms. Checking the client's laboratory values for potassium levels will help confirm the presence of hypokalemia.

Correct Answer: D

Rationale: In fostering a therapeutic relationship, demonstrating respect is essential as it helps the patient feel valued and understood. Respectful communication contributes to building trust and a safe environment for open and honest discussions.

Correct Answer: C

Rationale: Keeping the drainage system below the level of the chest (C) is crucial to ensure proper drainage and prevent backflow of air or fluid into the chest cavity. This position helps maintain the integrity of the closed drainage system. Ensuring the chest tube remains unclamped at all times (A) allows for continuous drainage. Emptying the chest tube (B) should be done as needed, not routinely every 2 hours. Assessing for subcutaneous emphysema (D) is important but not the most critical action in this scenario.