Final answer:
The nurse should first address the client's pain followed by the client's oxygenation. Pain management and ensuring proper oxygenation are important aspects of providing healthcare.
Step-by-step explanation:
The nurse should first address the client's pain followed by the client's oxygenation. In healthcare, it is important to prioritize the immediate needs and safety of the patient. Pain management is essential for the patient's comfort and well-being, while addressing oxygenation ensures the patient is receiving enough oxygen for proper body functioning. By addressing these needs, the nurse can provide appropriate care and support to the client.