Correct Answer: D

Rationale: The trough level of vancomycin should be drawn just before the next dose is administered, typically about 30 minutes before the scheduled dose. Since the morning dose is at 0700, the trough level should be drawn at 1800. This timing ensures an accurate measurement of the lowest concentration of the drug in the client's system before the next dose is given. Choice A (2100) is too close to the next dose, choice B (900) is too early, and choice C (1300) is also too far from the next dose.

Correct Answer: A

Rationale: Spinach is the correct answer because it is a good source of calcium, which is important for clients with lactose intolerance who are not consuming dairy products. Peanut butter, ground beef, and carrots do not provide as much calcium as spinach and are not the best choices for meeting the calcium needs of clients with lactose intolerance.

Correct Answer: B

Rationale: In end-stage liver disease, the liver's inability to convert ammonia into urea leads to elevated ammonia levels. Elevated ammonia levels can result in hepatic encephalopathy, a serious complication. Therefore, the correct answer is B. Elevated albumin (Choice A) is not typically seen in end-stage liver disease as liver dysfunction often leads to decreased albumin levels. Decreased total bilirubin (Choice C) is unlikely in end-stage liver disease, as bilirubin levels tend to be elevated due to impaired liver function. Decreased prothrombin time (Choice D) is also not expected in end-stage liver disease, as impaired liver function results in prolonged prothrombin time.

Correct Answer: C

Rationale: The correct action for the nurse to take before performing a closed intermittent bladder irrigation is to apply sterile gloves. Sterile gloves help maintain asepsis, reduce the risk of infection, and ensure patient safety during the procedure. Aspirating the irrigation solution from the bladder (Choice A) is not a standard step in closed intermittent bladder irrigation. Inserting the tip of the irrigation syringe into the catheter opening (Choice B) can introduce contaminants into the system. Opening the flow clamp to the irrigating fluid infusion tubing (Choice D) should only be done after ensuring all equipment is ready and the nurse is gloved to maintain sterility.

Correct Answer: D

Rationale: The correct answer is D. Elbow splints are utilized to prevent the child from touching the surgical site. However, it is essential to remove them periodically to conduct range-of-motion exercises to prevent joint stiffness. Choices A, B, and C are incorrect because providing an orthodontic pacifier, offering fluids using a straw, and cleansing the suture line with a cotton-tip swab are not directly related to postoperative care following a cleft palate repair.