The Whole Blood Renaissance
For decades, blood banks separated donated blood into components: packed red blood cells, plasma, and platelets. This component therapy allowed hospitals to use each product for specific needs. However, the military's experience in Iraq and Afghanistan demonstrated that whole blood transfusion in the prehospital setting produces better outcomes in hemorrhaging trauma patients. Civilian EMS is now adopting this approach with growing evidence of its effectiveness.
Why Whole Blood?
Whole blood contains red blood cells, plasma, platelets, and clotting factors in their natural ratios. When a trauma patient is bleeding severely, they are losing all of these components simultaneously. Replacing blood loss with crystalloid or individual components requires complex mixing, multiple product types, and still may not replicate the ideal ratios. Whole blood provides a physiologically balanced replacement in a single product.
Advantages of whole blood over component therapy include:
- Simpler administration: one product instead of multiple component types
- Balanced ratio of red cells to plasma to platelets
- Better hemostasis (clotting ability) compared to crystalloid or PRBCs alone
- Reduced risk of hemodilution and the lethal triad
- Less volume required to achieve the same hemodynamic effect
Prehospital Whole Blood Programs
Many EMS agencies now carry low-titer type O whole blood (LTOWB), which can be safely administered to most patients without blood type matching. LTOWB is screened for low levels of anti-A and anti-B antibodies, reducing the risk of hemolytic transfusion reactions. Cold-stored LTOWB has a shelf life of 21 to 35 days, requiring agencies to establish rotation agreements with blood banks to minimize waste.
Indications for Prehospital Whole Blood
- Penetrating trauma with suspected internal hemorrhage
- Blunt trauma with signs of hemorrhagic shock (tachycardia, hypotension, altered mental status)
- Traumatic cardiac arrest
- Patients receiving a tourniquet for extremity hemorrhage with signs of shock
- Massive transfusion protocol activation in the field
Administration and Monitoring
Administer whole blood through a standard blood administration set with an inline filter. Warm the product if possible to prevent worsening hypothermia. Monitor for transfusion reactions including fever, urticaria, dyspnea, and hypotension. Document the unit number, start time, volume infused, and the patient's hemodynamic response. Communicate the transfusion to the receiving hospital during your handoff so they can continue the transfusion and monitor for delayed reactions.