To challenge clinicians to reassess blood transfusion thresholds for packed red blood cells (PRBC) in ECMO patients amidst conflicting evidence and evolving practices, particularly focusing on the implications of recent studies.
Key Findings:
Haemoglobin concentration is a modifiable driver of oxygen delivery in ECMO, necessitating careful consideration of transfusion thresholds.
Dynamic shifts in plasma volume complicate the use of haemoglobin concentration as a transfusion trigger, highlighting the need for individualized assessment.
Liberal transfusion strategies may show early survival benefits but lack long-term differences, suggesting a need for reevaluation.
Transfusion benefits in VV-ECMO are only observed at critically low haemoglobin levels, reinforcing the importance of tailored approaches.
Interpretation:
Current transfusion practices in ECMO may not be adequately supported by evidence, necessitating a reevaluation of thresholds based on individual patient physiology rather than fixed laboratory values, particularly in light of recent studies.
Limitations:
Observational study designs may introduce confounding factors, impacting the reliability of findings.
Limited evidence exists for both VA-ECMO and VV-ECMO transfusion strategies, necessitating further research.
Guidelines from international societies remain inconclusive regarding specific transfusion thresholds for ECMO patients, complicating clinical decision-making.
Conclusion:
A critical reassessment of blood transfusion criteria in ECMO is essential, focusing on physiological needs rather than traditional thresholds, to improve patient outcomes.
