Correct Answer: C

Rationale: Placing a pillow between the client's legs is beneficial after hip replacement surgery to maintain proper alignment and prevent dislocation of the prosthesis. This position helps keep the hip in a neutral position, reducing the risk of dislocation. Encouraging the client to bend at the waist (Choice A) can increase the risk of hip dislocation. Maintaining the client in a high-Fowler's position (Choice B) and avoiding placing a pillow under the client's knees (Choice D) do not directly address the need to maintain proper alignment of the hip joint to prevent dislocation.

Correct Answer: B

Rationale: The correct answer is to prioritize investigating the client's medication history. This is important because certain medications can contribute to agitation in clients with dementia. Understanding the medication history can help identify potential causes of agitation and guide appropriate interventions. Checking for fluid and electrolyte imbalances is important in healthcare but may not directly relate to the client's agitation. While environmental factors can influence behavior, investigating the medication history is more pertinent in this case. Cognitive functioning assessment is crucial in dementia care but may not be the priority when addressing acute agitation.

Correct Answer: C

Rationale: The correct answer is C. After knee arthroplasty, it is essential for the client to use a front-wheeled walker when ambulating to ensure stability and prevent falls. Sharing this information with the assistive personnel (AP) is crucial for the client's safety and proper rehabilitation. Choices A, B, and D are incorrect because the roommate's independence, the client's footwear over stockings, and the timing of pain medication administration are not directly related to the safe ambulation of a client post-knee arthroplasty.

Correct Answer: C

Rationale: An elevated creatinine level indicates impaired kidney function, which may affect the client's ability to undergo surgery. The other laboratory values (white blood cell count, potassium level, and hemoglobin level) are within normal ranges and do not directly impact the client's readiness for surgery.

Correct Answer: C

Rationale: The most important nursing action when administering IV potassium is to administer it slowly and dilute it in IV fluids. This approach helps prevent irritation and hyperkalemia. Monitoring for decreased urine output (Choice A) is important but not as critical as ensuring the safe administration of IV potassium. Administering potassium via IV push (Choice B) is unsafe and can lead to adverse effects. Ensuring the client drinks water before administration (Choice D) is not directly related to the safe administration of IV potassium.