Correct Answer: B

Rationale: The correct answer is B: Maintain strict aseptic technique. This is crucial during thoracentesis to prevent infection. Step 1: Before the procedure, sterile equipment and supplies must be used. Step 2: Proper hand hygiene is essential to reduce the risk of introducing pathogens. Step 3: During the procedure, maintaining a sterile field helps minimize the risk of contamination. Step 4: After the procedure, ensuring proper disposal of all used supplies prevents the spread of infection. Summary: A: Placing the patient in a quiet and cool room may be comforting but is not directly related to the safety of the procedure. C: Advising the patient to sit still is important for accurate needle insertion but does not address infection prevention. D: Applying pressure over the puncture site is important but does not prevent infection if aseptic technique is not maintained.

Correct Answer: B

Rationale: The correct answer is B - Avoid traumatic injuries and exposure to any infection. For a client with pancytopenia caused by chemotherapy, their immune system is compromised, making them more susceptible to infections and bleeding. By avoiding traumatic injuries and exposure to infections, the client can reduce the risk of complications. Option A is incorrect because aggressive mouth care may further damage the already compromised oral mucosa. Option C is incorrect because excessive fluid intake may not be necessary and could worsen electrolyte imbalances. Option D is incorrect because muscle cramps and tingling sensations are not directly related to the main concern of infection and bleeding in pancytopenia.

Correct Answer: C

Rationale: The correct answer is C because performing a physical examination is the method nurses use to establish a patient's database. This involves directly assessing the patient's physical condition, gathering data on their health status, and identifying any abnormalities or concerns. Reviewing literature (A) is important but not a direct method of collecting patient data. Checking orders for tests (B) is part of data collection but not the initial step. Ordering medications (D) is a treatment action, not data collection.

Correct Answer: C

Rationale: The correct answer is C: He walked home in a cold rain. Walking in cold rain can lead to vasoconstriction, which impairs blood flow, increasing the likelihood of a sickle cell crisis in individuals with sickle cell disease. This can cause red blood cells to sickle and block blood vessels, leading to pain and tissue damage. Choices A, B, and D do not directly affect the physiology of sickle cell disease and are less likely to trigger a crisis.

Correct Answer: D

Rationale: The correct answer is D: Stop the transfusion. This is the first action the nurse should take because the sudden fever could indicate a transfusion reaction. Stopping the transfusion is crucial to prevent further complications. Continuing to monitor vital signs (choice C) may delay necessary intervention. Forcing fluids (choice A) could worsen the situation if it is a reaction to the transfusion. Increasing the flow rate of IV fluids (choice B) is not indicated as the priority is to stop the transfusion to prevent a potential adverse event.