[Erythrocyte transfusions: an evidence-based approach]

Area of Science:

• Transfusion Medicine
• Critical Care Medicine
• Evidence-Based Medicine

Background:

• Limited randomized controlled trials exist comparing restrictive vs. liberal red blood cell transfusion strategies.
• Existing evidence suggests similar outcomes between different transfusion thresholds.

Purpose of the Study:

• To review controlled studies on erythrocyte transfusion thresholds.
• To evaluate the benefits and risks of restrictive versus liberal transfusion strategies.

Main Methods:

• Systematic review of 19 controlled studies on erythrocyte transfusion thresholds published since the 1980s.

Main Results:

• Morbidity, mortality, and hemodynamic/respiratory variables were similar between restrictive (7-8 g/dL) and liberal (10 g/dL) transfusion strategies.
• Restrictive strategies may offer benefits, including reduced exposure to transfusions and fewer adverse events.
• Anemia has minimal impact on functional recovery and quality of life post-operatively.

Conclusions:

• Current transfusion practice recommendations lack robust evidence.
• A restrictive transfusion strategy (7-8 g/dL) is appropriate for most patients.
• High-quality trials are needed to establish optimal transfusion practices.