A 65-year-old male patient with septic shock is being prepared for air medical transport. His blood pressure is 70/40 mmHg, heart rate is 120 bpm, and he exhibits signs of poor perfusion. Which initial intervention is MOST appropriate to improve his oxygen delivery?
Transfusing packed red blood cells
Administering oxygen via non-rebreather mask
Starting a continuous infusion of vasopressors
Administering intravenous fluids