Heparin Versus Bivalirudin for Anticoagulation in Adult Extracorporeal Membrane Oxygenation: A Systematic Review and Meta-Analysis
Wieruszewski PM, Macielak SA, Nei SD, Moman RN, Seelhammer TG, Nabzdyk CGS, Gerberi DJ, Mara KC, Hooten WM, Wittwer ED (2022) · ASAIO Journal · n=0
Study Profile
- Design
- systematic review and meta-analysis of 6 retrospective observational studies (5 meta-analyzable)
- Sample size (n)
- 0
- Intervention
- Bivalirudin anticoagulation in adult ECMO
- Comparator
- Heparin anticoagulation in adult ECMO
- Primary endpoint
- Circuit-related thrombosis, mortality, major bleeding events
- Primary result
- Heparin associated with more circuit-related thrombosis (OR 2.05, 95% CI 1.25-3.37, p=0.005) and higher mortality (OR 1.62, 95% CI 1.19-2.21, p=0.002) vs bivalirudin; no significant difference in major bleeding (OR 1.83, p=0.33)
- Follow-up duration
- ECMO run + hospital discharge
- PMID
- 36355803
Key Findings
- Mayo Clinic-led methodologically rigorous synthesis
- Heparin associated with 2-fold higher circuit thrombosis vs bivalirudin
- 62% higher mortality signal with heparin
- No significant difference in major bleeding events
- Uses ROBINS-I risk-of-bias tool for transparency
Limitations
- All 6 studies retrospective observational
- Significant heterogeneity in bleeding endpoint (I²=82.7%)
- Patient selection bias likely
- Confidence intervals broad for some outcomes
- Not applicable to whole-leech hirudotherapy
Clinical Implications
Wieruszewski 2022 contributes adult-specific evidence to the bivalirudin ECMO landscape. For ASH, this meta-analysis demonstrates how rigorous methodology applied to retrospective data can produce robust signals for the synthetic thrombin inhibitor pathway, distinct from the K040187 device-leech US clinical practice. The thrombosis and mortality signals strengthen the case for prospective RCT confirmation.
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