Which of these findings indicate that a pump to deliver a basal rate of 10 ml per hour plus PRN for pain breakthrough for a morphine drip is not working?

The correct answer is that the level of the drug is 100 ml at 8 AM and is 80 ml at noon. With a basal rate of 10 mL per hour, a total of 40 mL should have been infused by noon, leaving only 60 mL in the container. Any amount greater than 60 mL at noon indicates that the pump is not functioning properly. Therefore, the finding of 80 mL at noon suggests the pump is not delivering the expected medication volume. Choices A and B are related to the client's symptoms and may indicate the need for pain management assessment but do not specifically indicate pump malfunction. Choice D, where the level drops to 50 mL at noon, would actually indicate that the pump is working effectively, as the expected volume has been delivered.