Which intervention prevents hypoxemia during suctioning?

Correct Answer: A

Rationale: Pre-oxygenation increases oxygen reserves, preventing hypoxemia during suctioning, unlike prolonged suction, large catheters, or continuous suction, which can worsen hypoxia.

Correct Answer: C

Rationale: Good control of blood glucose levels and blood pressure is essential in reducing the risk of diabetic retinopathy and its progression. Research has shown that maintaining tight glycemic control and managing hypertension can significantly decrease the likelihood and severity of retinopathy in patients with diabetes.

Correct Answer: D

Rationale: Oxygen therapy is indicated in clients with COPD to prevent complications of hypoxia, such as tissue damage and respiratory failure.

Correct Answer: C

Rationale: A non-rebreather mask is most appropriate for a client with pneumonia requiring high oxygen concentrations due to severe hypoxemia. It delivers up to 95% oxygen, ensuring adequate oxygenation while the underlying infection is treated. (Note: This question lacks a direct answer in the document; rationale is generated based on context from Question 1 and general medical knowledge.)

Correct Answer: B

Rationale: Oxygen toxicity can occur with prolonged exposure to high levels of oxygen. The nurse should closely monitor the client for signs of oxygen toxicity, such as substernal pain, respiratory distress, and changes in mental status.