Correct Answer: A

Rationale: The correct answer is to check the ventilator tubing for disconnection first when a patient on mechanical ventilation experiences a sudden drop in oxygen saturation. This is crucial because equipment malfunction, such as tubing disconnection, can lead to decreased oxygen delivery, resulting in a drop in oxygen saturation. Checking the tubing ensures that the ventilation system is functioning properly and that the patient is receiving the necessary oxygen. Option B is incorrect because increasing oxygen flow without checking for equipment issues may not address the root cause of the drop in saturation. Option C is not the priority in this situation as the immediate focus should be on assessing and ensuring the functioning of the ventilation equipment. Option D delays addressing the potential equipment malfunction, which could worsen the patient's condition if not promptly resolved.

Correct Answer: B

Rationale: The presence of chronic illness is the factor that places a patient at the highest risk for infection. Chronic illness can compromise the immune system's ability to fight off infections effectively, making individuals more susceptible to getting sick. Option A, a healthy immune system, actually reduces the risk of infection. Option C, being well-nourished, can support overall health but does not directly correlate with infection risk. While age over 65 years is a risk factor for certain infections due to age-related immune system changes, chronic illness has a more significant impact on infection risk.

Correct Answer: A

Rationale: The correct answer is to encourage early ambulation and leg exercises. By promoting early ambulation and leg exercises, blood flow is enhanced, reducing the risk of venous thromboembolism (VTE) in postoperative patients. Choice B, applying compression stockings, helps prevent VTE but is not as effective as early ambulation and exercises. Choice C, administering anticoagulants, is important in VTE prevention but does not directly address improving circulation through physical activity. Choice D, elevating the patient's legs, may be beneficial for circulation in specific cases but is not as effective in preventing VTE as early ambulation and leg exercises.

Correct Answer: B

Rationale: When a medication error occurs, the most appropriate action for a healthcare professional is to report the error to the healthcare provider immediately. This is crucial for ensuring prompt corrective action to mitigate any potential harm to the patient. Documenting the error is important but should come after reporting it to the relevant authorities. Apologizing to the patient is important for maintaining trust and communication but should not take precedence over reporting and addressing the error. Continuing to administer the medication without addressing the error is unsafe and goes against patient safety protocols.

Correct Answer: B

Rationale: The most appropriate instruction to prevent falls at home is to remove loose rugs and install grab bars in high-risk areas like the bathroom. This helps eliminate tripping hazards and provides stability for the patient. Keeping the living space well-lit (Choice A) is important but may not directly address fall prevention. Using furniture for support (Choice C) can lead to accidents if the furniture is not stable. Wearing socks without shoes (Choice D) increases the risk of slipping rather than preventing falls.