Correct Answer: D

Rationale: The correct answer is D, a history of allergy to shellfish. A known allergy to shellfish is a contraindication for the use of contrast media in a CT scan due to the potential risk of an allergic reaction, which could be severe and life-threatening. Choices A, B, and C are not contraindications to the procedure. A normal white blood cell count, urine specific gravity within the normal range, and a history of asthma do not typically interfere with the administration of contrast media for a CT scan.

Correct Answer: B

Rationale: The correct action for the nurse to take when preparing to perform postmortem care is to remove the client's IV lines. This step is essential to help maintain the dignity and appearance of the body. Placing the client's dentures in a labeled container (Choice A) is not a priority during postmortem care as the focus is on the body's preparation. While positioning the body in a semi-fowler's position (Choice C) or lowering the client's head of the bed (Choice D) are common practices for living clients to prevent aspiration, they are not necessary after death. Therefore, the immediate action of removing IV lines is most appropriate in this situation.

Correct Answer: B

Rationale: The correct answer is B. A heart rate of 68/min is lower than expected and should be reported as it may indicate digoxin toxicity. Choices A, C, and D are within normal limits for a client receiving furosemide for heart failure and do not require immediate reporting. Weight loss may be expected due to diuretic therapy, a potassium level of 3.8 mEq/L is within the normal range, and a urine output of 60 mL/hr indicates adequate renal perfusion.

Correct Answer: C

Rationale: The correct action for the nurse to take when caring for a client with a chest tube connected to a water-seal drainage system is to add sterile water to the water-seal chamber. This is necessary to maintain the correct water level for proper chest tube function. Clamping the chest tube during ambulation (Choice A) is incorrect as it can lead to complications by obstructing drainage. Keeping the collection chamber below the level of the chest (Choice B) is incorrect because it should be kept below the chest to facilitate drainage. Emptying the collection chamber every 12 hours (Choice D) is incorrect as it should be emptied whenever it reaches the fill line or as per facility policy, not on a fixed time schedule.

Correct Answer: B

Rationale: The correct answer is B: Weight gain. Weight gain is a common finding in clients with systemic lupus erythematosus due to fluid retention. Joint pain (choice A) is also common in SLE but is not specific to fluid retention. A butterfly-shaped rash on the face (choice C) is a classic symptom of SLE but is not related to fluid retention. Increased appetite (choice D) is less likely in SLE compared to weight gain.