Liberal or restrictive transfusion after cardiac surgery

Area of Science:

• Cardiology
• Transfusion Medicine
• Critical Care Medicine

Background:

• The optimal hemoglobin threshold for red-cell transfusions post-cardiac surgery remains debated.
• Uncertainty exists regarding the comparative effectiveness of restrictive versus liberal transfusion strategies on patient outcomes and healthcare expenses.

Purpose of the Study:

• To compare the efficacy of restrictive versus liberal hemoglobin thresholds for red-cell transfusions in reducing postoperative morbidity and healthcare costs following cardiac surgery.

Main Methods:

• A multicenter, parallel-group trial involving over 2000 adult patients undergoing non-emergency cardiac surgery in the UK.
• Patients with postoperative hemoglobin <9 g/dL were randomized to restrictive (<7.5 g/dL) or liberal (<9 g/dL) transfusion thresholds.
• Primary outcome: serious infection or ischemic event within 3 months; secondary: healthcare costs.

Main Results:

• No significant difference in the primary composite outcome of serious infection or ischemic events between restrictive (35.1%) and liberal (33.0%) groups (OR, 1.11; 95% CI, 0.91-1.34).
• Higher mortality was observed in the restrictive group (4.2%) compared to the liberal group (2.6%) (HR, 1.64; 95% CI, 1.00-2.67; P=0.045).
• Total healthcare costs did not differ significantly between the two transfusion strategies.

Conclusions:

• A restrictive red-cell transfusion threshold is not superior to a liberal threshold in mitigating morbidity or healthcare costs after cardiac surgery.
• The findings suggest potential increased mortality with restrictive transfusion strategies in this patient population.