Correct Answer: C

Rationale: When a surgical mask becomes moist, it loses its effectiveness as a barrier against microorganisms. Therefore, the perioperative nurse should apply a new mask. Choice A is incorrect because a moist mask should not be continued to be worn even if the nurse is comfortable. Choice B is not the best course of action as the mask should be changed immediately when it becomes moist. Choice D is also incorrect as waiting for the mask to air-dry is not recommended due to the loss of barrier effectiveness.

Correct Answer: B

Rationale: During a fire emergency, it is crucial to close all doors to contain smoke and fire, helping to protect the patients. This action can prevent the spread of fire and smoke to the area where patients are located. Identifying evacuation routes is also important for a timely and orderly evacuation if necessary. Waiting for the fire department to arrive before taking action (Choice A) can waste valuable time and put patients at risk. Moving bedridden patients in their beds (Choice D) can be dangerous during a fire and should be avoided as it can expose patients and staff to more risks.

Correct Answer: B

Rationale: The nurse's priority action should be to withhold the medication until the trough level is obtained. This is crucial to ensure accurate dosing based on the patient's levels. Administering the medication before the peak level is obtained (choice A) can lead to incorrect dosing. Administering the medication based on the previous trough level (choice C) may not reflect the current levels accurately. Ensuring that the medication is administered within 2 hours of the peak level (choice D) is not necessary for obtaining accurate peak and trough levels.

Correct Answer: B

Rationale: Reporting the behavior to the nurse manager immediately is the most appropriate action when a nurse suspects a colleague of being impaired while on duty. This is crucial to ensure patient safety and maintain a professional and safe work environment. Speaking to the colleague in private may not address the issue effectively and could potentially put patients at risk if the colleague is indeed impaired. Confronting the colleague directly on the floor may lead to a confrontation and is not the most professional way to handle the situation. Doing nothing and documenting the situation without taking immediate action can jeopardize patient safety and is not an appropriate response when substance use is suspected.

Correct Answer: A

Rationale: The correct answer is to ensure the catheter tubing is not kinked. This is the priority action because a kinked tubing can obstruct urine flow, leading to discomfort and potential complications. It is essential to troubleshoot the current catheter first before considering other interventions. Irrigating the catheter (Choice B) may not address the underlying issue of kinking. Changing the catheter to a smaller size (Choice C) or removing and replacing it with a new one (Choice D) should only be considered if ensuring the tubing is unkinked does not resolve the discomfort.