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Restrictive Versus Liberal Transfusion in Symptomatic Coronary Artery Disease and Myocardial Infarction: A
Sahib Singh1, Udaya S Tantry2, Kevin Bliden2
1Department of Medicine, Sinai Hospital of Baltimore, Baltimore, MD.
Insights
For patients with coronary artery disease (CAD) and myocardial infarction (MI), a liberal red blood cell transfusion strategy may improve cardiovascular outcomes compared to a restrictive approach. This finding suggests a potential shift in transfusion guidelines for these high-risk patients.
Area of Science:
- Cardiology
- Transfusion Medicine
- Clinical Trials
Background:
- Anemia in patients with coronary artery disease (CAD) and myocardial infarction (MI) is linked to worse cardiovascular (CV) outcomes.
- Optimal red blood cell transfusion strategies for these patients remain uncertain.
Purpose of the Study:
- To conduct a meta-analysis of randomized controlled trials (RCTs).
- To compare restrictive versus liberal red blood cell transfusion strategies in patients with symptomatic CAD/MI.
Main Methods:
- Searched multiple databases (Cochrane, Pubmed, Embase, MEDLINE) for relevant RCTs.
- Analyzed data using a random-effects model to calculate pooled odds ratios (ORs) and 95% confidence intervals (CIs).
- Evaluated endpoints including major adverse CV events (MACEs), MI, all-cause death, CV death, revascularization, heart failure (HF), and infection.
Main Results:
- Included 5 RCTs with 4518 patients; 2258 received restrictive and 2260 liberal transfusion.
- At 30 days, MACE and MI rates were similar between groups.
- Longer-term follow-up showed restrictive transfusion increased MACE (OR 1.18) and MI (OR 1.27) risks, with a trend towards higher all-cause death (OR 1.21) compared to liberal transfusion.
Conclusions:
- A liberal red blood cell transfusion strategy may be associated with better CV outcomes in symptomatic CAD/MI patients.
- Results suggest liberal transfusion could be superior to restrictive transfusion in this population.
Background:
In patients with coronary artery disease (CAD) and/or myocardial infarction (MI), anemia is associated with an increased risk of adverse cardiovascular (CV) outcomes. Transfusion goals in such patients remain unclear.
Study Question:
A meta-analysis of the available randomized controlled trials (RCTs) was conducted comparing restrictive and liberal transfusion strategies in patients with symptomatic CAD/MI.
Data Sources:
Multiple online databases including Cochrane, Pubmed, Embase, and MEDLINE were searched for RCTs.
Study Design:
End points of interest were major adverse CV events (MACEs), MI, all-cause death, CV death, revascularization, heart failure (HF), and infection. Pooled odds ratios (ORs) and 95% confidence intervals (CIs) were calculated using a random-effects model.
Results:
A total of 5 RCTs with 4518 patients-2258 in the restrictive transfusion group and 2260 in the liberal transfusion group-were included. The mean age was 72 years, and 59% of patients were men. At 30 days, MACE and MI were similar in the 2 transfusion groups. However, at the longest available follow-up, the restrictive strategy was associated with increased risks of MACE (OR 1.18, 95% CI, 1.02-1.37; P = 0.03) and MI (1.27, 95% CI, 1.02-1.58; P = 0.04), along with the higher trend of all-cause death (1.21, 95% CI, 1.00-1.46; P = 0.05) as compared with liberal transfusion. The 2 groups had comparable rates of CV death, revascularization, HF, and infection.
Conclusions:
Liberal transfusion strategy may be associated with improved CV outcomes among patients with symptomatic CAD/MI as compared with a restrictive transfusion strategy.
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