Restrictive versus Liberal Transfusion Strategies in Acute Myocardial Infarction and Anemia: A Meta-Analysis and...

Area of Science:

• Cardiology
• Hematology
• Critical Care Medicine

Background:

• Optimal red blood cell transfusion strategy for acute myocardial infarction (AMI)-associated anemia is not well-defined.
• Anemia in AMI patients presents a significant clinical challenge, impacting outcomes.

Purpose of the Study:

• To compare all-cause mortality between liberal versus restrictive red blood cell transfusion strategies in patients with AMI-associated anemia.
• To evaluate the efficacy and safety of different transfusion thresholds in this patient population.

Main Methods:

• Systematic literature search of randomized controlled trials (RCTs) in PubMed, Embase, and ClinicalTrials.gov.
• Random-effects meta-analysis and trial sequential analysis (TSA) were employed to assess outcomes.
• Pooled analysis included 4,217 participants from three RCTs with 30-day follow-up.

Main Results:

• No statistically significant difference in all-cause mortality between liberal and restrictive transfusion strategies (RR 1.03; 95% CI 0.67-1.57; p=0.90).
• Similar outcomes were observed for recurrent AMI, heart failure, stroke, and kidney injury.
• No significant differences in safety endpoints like infection or lung injury were detected.

Conclusions:

• Current evidence does not support a clear advantage of liberal over restrictive transfusion strategies for AMI-associated anemia regarding 30-day mortality or other major clinical events.
• Heterogeneity in blood product utilization within restrictive transfusion protocols may contribute to variable findings across studies.