Correct Answer: B

Rationale: The correct answer is B. The client with renal failure and high potassium levels requires immediate attention because hyperkalemia can lead to life-threatening cardiac complications. Administering sodium polystyrene sulfonate helps lower the potassium levels. Choice A, the client with pneumonia and a high WBC count, although important, does not present an immediate life-threatening condition. Choice C, the post-CABG client prescribed atorvastatin, and Choice D, the client with anemia and a hemoglobin level of 11g/dL prescribed epoetin alfa, do not require immediate intervention compared to managing hyperkalemia in a client with renal failure.

Correct Answer: A

Rationale: The correct answer is A: Pregnancy status. Raloxifene is a pregnancy category X drug, which means it can cause serious birth defects. Therefore, it is crucial for the nurse to assess the client's pregnancy status before initiating therapy. Choice B, bone density, while important in osteoporosis management, is not a specific concern related to initiating raloxifene therapy. Choice C, calcium levels, and choice D, blood pressure, are not directly related to the initiation of raloxifene therapy in a female client with osteoporosis.

Correct Answer: B

Rationale: Covering the tracheostomy when outside is crucial as it helps prevent dust and other irritants from entering the airway, reducing the risk of complications. Cleaning with alcohol (choice A) can be too harsh for the skin around the tracheostomy site. While replacing the tube weekly (choice C) is important, it is typically done by healthcare providers. Using tap water to clean (choice D) is not recommended as it may introduce contaminants to the tracheostomy site.

Correct Answer: B

Rationale: The correct answer is Vitamin C. Vitamin C is essential for wound healing due to its role in collagen production. Collagen is crucial for wound repair and the formation of new tissue. Vitamin B12 is important for nerve function and DNA synthesis but is not directly related to wound healing. Vitamin K is essential for blood clotting and bone health but does not directly promote wound healing. Vitamin D plays a role in bone health and immune function but is not a primary vitamin involved in wound healing.

Correct Answer: C

Rationale: The correct action for the nurse to take is to withdraw 3 to 5 ml of urine from the port for an accurate culture and sensitivity test. Wiping the area around the needleless port with sterile water (Choice A) is not necessary when obtaining a urine specimen. Inserting the syringe into the needleless port at a 60-degree angle (Choice B) is incorrect as it does not align with the correct procedure for obtaining a urine specimen. Donning sterile gloves (Choice D) is a good practice but not the immediate action required for obtaining a urine specimen.