The nurse caring for a patient receiving a transfusion notes that 15 minutes after the infusion of packed red blood cells (PRBCs) has begun, the patient is having difficulty breathing and complains of severe chest tightness. What is the most appropriate initial action for the nurse to take?
A. Notify the patient's physician.
B. Stop the transfusion immediately.
C. Remove the patient's IV access.
D. Assess the patient's chest sounds and vital signs.