A nurse is reinforcing teaching with a client who is scheduled for a cardiac catheterization. Which of the following should the nurse tell the client to expect during injection of the contrast medium?

The correct answer is choice A, participate in reminiscence therapy with the client. This is an effective intervention for individuals with Alzheimer's disease. It involves encouraging the client to discuss past experiences and events. It has been shown to improve mood, decrease agitation, and increase communication skills. The reminiscence therapy should be individualized and tailored to the client's interests and abilities.

1. Raising the four side rails on the client's bed is not the correct answer because this could cause harm to the client by restricting their mobility and independence.
2. Alternating the client's daily routine is not the correct answer because individuals with Alzheimer's disease benefit from a consistent routine, which helps them to feel more secure and less anxious.
3. Keeping the lights dimmed is not the correct answer because it can be disorienting and confusing for clients with Alzheimer's disease, who need adequate lighting to distinguish their surroundings.

The correct answer is choice B: Store opened insulin vials at room temperature for up to 4 weeks.

Choice B rationale: Opened insulin vials can be stored at room temperature (59°F to 86°F or 15°C to 30°C) for up to 4 weeks. After this period, the insulin may lose potency, and a new vial should be used.

Choice A rationale: Regular insulin is short-acting, and its peak effect occurs 2 to 3 hours after administration. Eating a snack 6 hours after insulin administration may not be necessary as the insulin would have already reached its peak effect, and blood glucose levels should be monitored accordingly.

Choice C rationale: Warming the insulin vial to dissolve crystals is not recommended. Insulin should be inspected before use, and if crystals or clumps are present, it should be discarded as this could indicate that the insulin has lost its effectiveness.

Choice D rationale: Unopened insulin vials should be stored in the refrigerator (36°F to 46°F or 2°C to 8°C) and should not be frozen. Freezing can cause insulin to lose potency or become ineffective. Once opened, insulin vials can be stored at room temperature for up to 4 weeks, as mentioned in choice B.