Correct Answer: C

Rationale: The correct answer is C: Administer an incentive spirometer. Using an incentive spirometer helps prevent atelectasis by encouraging lung expansion after surgery. Encouraging deep breathing exercises (choice A) is beneficial but may not be as effective as an incentive spirometer. Encouraging the client to cough (choice B) helps with airway clearance but does not directly prevent atelectasis. Assisting the client to ambulate (choice D) is important for preventing complications such as deep vein thrombosis, but it is not the most effective intervention for preventing atelectasis.

Correct Answer: C

Rationale: The correct instruction for a client with left-leg weakness using a cane is to maintain two points of support on the floor at all times. This technique provides stability and support while walking. Choice A is incorrect because the cane should be used on the stronger side to support the weaker leg. Choice B is incorrect as advancing the cane and the strong leg together may not provide adequate support and balance. Choice D is incorrect as the distance to advance the cane with each step can vary depending on the individual's needs and abilities.

Correct Answer: A

Rationale: In acute renal failure, it is crucial to monitor urine output to assess kidney function and fluid balance. Administering diuretics helps manage fluid levels by promoting urine production. Choice B is incorrect because administering IV fluids can worsen fluid overload in renal failure patients, and restricting potassium intake is not typically the initial approach. Choice C is not the primary intervention but is important for long-term management. Choice D is incorrect as administering potassium can be dangerous in renal failure, and restricting fluids can lead to dehydration.

Correct Answer: A

Rationale: The correct answer is A: Chest pain radiating to the arm and shortness of breath. These are classic signs of an acute myocardial infarction. Choice B is incorrect because nausea, vomiting, and high fever are not typical signs of a heart attack. Choice C is incorrect as headache, confusion, and low blood pressure are not specific to myocardial infarction. Choice D is incorrect because an acute myocardial infarction typically presents with an increased heart rate, not bradycardia.

Correct Answer: C

Rationale: The correct instruction for the client with left-leg weakness using a cane is to maintain two points of support on the floor. This ensures stability and balance while walking. Choice A is incorrect because the cane should be used on the strong side of the body to provide additional support. Choice B is incorrect as the cane and the weak leg should move together for support. Choice D is incorrect as advancing the cane too far with each step may compromise balance and stability.