Bleeding and thrombotic events (BTE) are frequent during extracorporeal membrane oxygenation (ECMO). They occur at varying timepoints and may be affected by temporal changes in coagulation and fibrinolysis. We aimed to assess various coagulation and fibrinolytic markers over time and their relationship with BTE.
Methods
A single-centre prospective study was performed in 17 patients with severe respiratory failure receiving veno-venous ECMO. Blood samples were collected before and during ECMO, and around circuit decannulation.
Results
Prior to ECMO, D-Dimer, Plasmin-Antiplasmin complexes (PAP), Plasminogen-Activator Inhibitor-1 (PAI-1) and fibrinogen were elevated. There was an increase in D-Dimer and Prothrombin Fragments 1+2 (PF1+2) (729 to 1305pmol/L, p = .034) by day 1 and PAP increased by day 2 from baseline levels (median 1022 to 1797 µg/L, p = .023). There was a strong positive correlation in PAP, PF1+2 and thrombin-antithrombin complexes (TAT) to D-Dimer. BTE were frequent – 18% had major extracranial haemorrhage and 24% had intracranial haemorrhage. Over time, there was a progressive elevation PAP in patients developing subsequent extracranial haemorrhage, whereas D-Dimer, PAP and PF1+2 increased after intracranial haemorrhage.
Conclusions
There were early changes in coagulation activity during ECMO by PF1+2 followed by subsequent fibrinolysis by PAP. Changes in PAP, PF1+2 and TAT were associated with major haemorrhage.
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