Frequency of Hemorrhages Associated With the Functional Anomalies of Willebrand Factor in Emergency Patients

ECMO has improved the outcome of heart or respiratory failure and carcinogenic shock and are increasingly used. However bleeding complications occurring in up to 50% of patients are poorly understood and worsen the overall results. The aim is to investigate the occurence of bleeding and its frequency according to the type of ECMO either veno-arterial or veno-venous. The investigators also want to assess the relation of bleeding with von Willebrand Factor defects.