Red cell transfusion thresholds for preterm infants: finally some answers

Area of Science:

• Neonatal Medicine
• Pediatric Hematology
• Critical Care Pediatrics

Background:

• Infants with extremely low birthweight (ELBW) often develop anemia in the neonatal intensive care unit (NICU).
• This anemia results from physiological newborn anemia, umbilical cord clamping, blood loss for lab tests, and delayed red blood cell production.
• Current transfusion practices for ELBW infants rely on varying hemoglobin thresholds, lacking clear consensus.

Purpose of the Study:

• To evaluate the impact of different hemoglobin transfusion thresholds on neurodevelopmental outcomes and survival in ELBW infants.
• To provide evidence-based guidance on optimal transfusion strategies for anemia in ELBW neonates.

Main Methods:

• Two large, similar clinical trials (ETTNO and TOP) were conducted.
• These trials compared higher versus lower hemoglobin thresholds for packed red blood cell transfusions in ELBW infants.
• The primary outcome assessed was neurodevelopmental impairment or death at 2 years corrected age.

Main Results:

• No significant difference was found in the primary outcome (neurodevelopmental impairment or death) between higher and lower hemoglobin transfusion thresholds in either trial.
• Neither study showed a difference in the individual components of the primary outcome.
• The results were conclusive and concordant across both trials.

Conclusions:

• Hemoglobin transfusion thresholds ranging from 11-13 g/dL for critically ill/ventilated infants and 7-10 g/dL for stable infants are safe.
• These thresholds can be used without adversely affecting survival or neurodevelopment in ELBW infants.
• The findings provide clear guidance for transfusion practices in neonatal intensive care units.