The nurse is monitoring a client receiving a blood transfusion when the client develops a cough with shortness of breath. The client also has a headache and a racing heart. What should the nurse do...

The nurse is monitoring a client receiving a blood transfusion when the client develops a cough with shortness of breath. The client also has a headache and a racing heart. What should the nurse do first?

1. Slow the infusion rate.

2. Replace the blood with saline.

3. Administer an antihistamine.

4. Place the client flat with the feet elevated.