Whole Blood Transfusions in Pediatric Anesthesia

Introduction

• Whole blood is composed of packed red blood cells, which determine the ABO and Rh blood type, and plasma, which contains antibodies against the absent ABO antigens, and platelets.
• A donor with group A red cells will have anti B antibodies in the plasma, while a group B red cell donor will have anti-A antibodies.
• Group O red cell donors are considered universal for red cell transfusion, as they have both anti-A and anti-B antibodies in their plasma (Table 1).
• The Rh antigen differs in that anti-Rh antibodies are not naturally present; they develop only when an Rh-negative recipient is exposed to Rh-positive blood. Thus, an Rh-negative donor does not carry anti-Rh antibodies in plasma, unlike the anti-B antibodies found in type A donors. Consequently, the universal donor for packed red cells is type O Rh negative, and the universal plasma donor is type AB Rh negative. In contrast, there is no universal donor for whole blood.
• For additional information, please refer to the OpenAnesthesia summary: ABCs of Blood Transfusions. Link

Merits of Whole Blood

• Pediatric trauma patients requiring massive transfusion protocols (MTPs) had reduced early mortality and comparable safety when resuscitated with LTOWB (see below for more details) compared with traditional component therapy.¹
• Additionally, whole blood resuscitation simplifies MTPs and may improve early hemostatic control compared with component therapy.²
• Whole blood is advantageous for several reasons, as mentioned in the table below.³

• The Pediatric Traumatic Hemorrhagic Shock Consensus Conference suggests the use of low-titer, group O whole blood in pediatric trauma patients with hemorrhagic shock.³ While whole blood offers many advantages over individual component therapy, it is important to remember that group O whole blood can still place non-group O recipients at risk for hemolysis due to donor anti-A or anti-B antibodies, depending on the blood type. To reduce this risk, low-titer (≤256 anti-A, anti-B antibodies) group O whole blood is used.
• Please see the OA summary on whole blood transfusions for more details. Link

Leukocyte Reduction

• Leukocyte-reduced LTOWB may further enhance safety by reducing febrile nonhemolytic reactions and minimizing the risk of cytomegalovirus transmission.
• Although leukoreduction can slightly reduce platelet yield, current evidence suggests minimal impact on hemostatic efficacy.² Most transfusion services utilize prestorage leukoreduction, preserving platelet function while adhering to pediatric Patient Blood Management (PBM) principles and Association for the Advancement of Blood and Biotherapies standards.

Pediatric Indications

• LTOWB is increasingly being used in pediatric resuscitation due to its balanced composition and logistical advantages.
• LTOWB can be used in pediatric trauma resuscitation up to 40mL/kg. One case report describes 80ml/kg of LTOWB administered to a neonate for massive hemorrhage secondary to trauma.⁵
• Type-specific, cross-matched whole blood has also been used in elective craniofacial, congenital cardiac, and complex spine surgery.
• In a retrospective study of pediatric craniofacial surgery, patients who received type-specific whole blood had less donor exposure and reduced intraoperative blood loss compared with those who received reconstituted blood (packed red cells and fresh-frozen plasma from the same donor in a 1:1 ratio.⁶
• In a prospective study of pediatric spine surgery, patients who received whole blood had a shorter intensive care unit (ICU) stay and a reduced inflammatory response compared with those who received component therapy in a 1:1:1 ratio.⁷
• LTOWB has been used for hemorrhage from medical causes, including gastrointestinal bleeding, menorrhagia, and severe anemia, at some tertiary care pediatric centers.⁸
• Pre-hospital Use: A city in Texas authorizes first responders to administer LTOWB to pediatric patients at the point of injury, in the field, when specific criteria are met:
  • Systolic blood pressure (SBP) less than 70mmHg, or
  • SBP less than 90 mmHg AND heart rate above 110 beats per minute
  • End-tidal CO₂ less than 25 mmHg, or
  • Witnessed cardiac arrest less than 5 minutes with continuous cardiopulmonary resuscitation being provided.⁶
• When these criteria are met, first responders may administer 500 mL of whole blood to children aged 6-10 years, and 1000 mL to patients aged 11-13 years and older.⁹

Outcomes

• LTOWB provides hemostatic outcomes that are equivalent to, and in some cases superior to, those achieved with balanced component therapy.
• LTOWB transfusion is associated with decreased total product volume and earlier resolution of shock.²
• Studies show shorter time to first transfusion, rapid correction of coagulopathy, and faster improvement in base deficit.⁴
• Children receiving LTOWB required fewer total transfusion episodes and achieved quicker normalization of coagulation parameters.⁹
• Across available studies, LTOWB has demonstrated consistent safety, with no increased risk of transfusion-related adverse events, including hemolysis or alloimmunization.⁴
• The use of typed and cross-matched whole blood in selective, elective surgeries has been associated with reduced donor exposure, decreased blood loss, shorter ICU stays, and lower inflammatory response.

Pitfalls: Hemolysis

• Concerns regarding hemolytic reactions with LTOWB have been mitigated by adopting low anti-A and anti-B titer thresholds.
• No clinically significant hemolytic events have been reported following LTOWB transfusion in children.^2,4
• Surveillance protocols, including direct antiglobulin testing and hemolysis panels, have confirmed the rarity of immune-mediated complications in well-screened LTOWB inventories.

PBM Integration

• The integration of LTOWB into pediatric PBM programs focuses on minimizing unnecessary transfusions, optimizing hemostatic balance, and reducing donor exposures.
• Key PBM considerations include:
  • Protocol standardization: Establishing clear criteria for LTOWB use within pediatric MTPs.
  • Inventory management: Shelf life typically limited to 14 days; close coordination with adult trauma services helps prevent wastage.
  • Team education: Simulation and competency training improve activation speed and transfusion accuracy.
  • Data tracking: Continuous quality improvement through monitoring transfusion volume, product age, and outcomes.
  • As summarized in PBM literature, LTOWB aligns with PBM principles by maximizing transfusion efficiency and conserving blood resources.