Hemoglobin-oxygen affinity changes in neonatal blood transfusions: RBC selection insights

Area of Science:

• Neonatal Physiology
• Blood Transfusion Medicine
• Red Blood Cell Biology

Background:

• Preterm newborns often require blood transfusions, but the effect of adult packed red blood cells (pRBCs) on fetal red blood cell (RBC) oxygen affinity is not fully understood.
• Investigating the influence of adult pRBCs on fetal RBC oxygen binding is crucial for optimizing neonatal transfusion practices.

Purpose of the Study:

• To investigate the impact of adult pRBC transfusions on the oxygen binding properties of fetal RBCs from preterm newborns.
• To explore how the biological age of adult pRBCs influences fetal blood oxygen affinity.

Main Methods:

• Cord blood samples from preterm infants were titrated with young (Y-RBC) and old (O-RBC) adult pRBCs in an in vitro transfusion model.
• Key parameters measured included oxygen affinity (p50), hemoglobin variants (HbF and HbA), and RBC indices.

Main Results:

• Titration of cord blood with adult pRBCs led to a concentration-dependent decrease in p50, indicating increased oxygen affinity.
• Hemoglobin analysis showed a shift from fetal hemoglobin (HbF) to adult hemoglobin (HbA) post-transfusion.
• Older adult RBCs (O-RBCs) had a more significant impact on p50 values compared to younger adult RBCs (Y-RBCs).

Conclusions:

• In vitro, adult pRBC transfusion significantly alters fetal blood oxygen binding, increasing its affinity.
• The biological age of transfused adult RBCs influences their impact on fetal oxygen binding, with older cells having a greater effect.
• These findings highlight the importance of considering adult pRBC characteristics in neonatal transfusions to mitigate potential morbidities related to oxygen physiology.