Final answer:
The nurse can assist in pain relief for a client with lower back pain by having the client perform active exercises, using massage and heat application, and administering opioid analgesics.
Step-by-step explanation:
The nurse can employ several actions to assist in pain relief for a client with lower back pain. One action is to have the client perform active exercises to stretch the back muscles. This can help alleviate pain and improve flexibility. Another action is to use massage and heat application to the lower back, which can help relax the muscles and reduce pain. Lastly, opioid analgesics can be administered to provide pain relief, although they should be used judiciously and under medical supervision.