Kaplan Meier estimate of events during MARS. Patients were grouped according to anticoagulation regimen during MARS treatment. None of the patients receiving citrate anticoagulation developed an event necessitating preterm cessation of MARS treatment. Four sessions without anticoagulation were interrupted preterm, one due to uncontrollable bleeding and three due to occlusive clotting of the extracorporeal blood circuit. Log Rank P = 0.03. MARS, Molecular Adsorbents Recirculation System.