Aprotinin and transfusion requirements in orthotopic liver transplantation: a multicentre randomised double-blind study. EMSALT Study Group.

Background: Intraoperative hyperfibrinolysis contributes to bleeding during adult orthotopic liver transplantation. We aimed to find out whether aprotinin, a potent antifibrinolytic agent, reduces blood loss and transfusion requirements.

Methods: We did a randomised, double-blind, placebo-controlled trial in which six liver-transplant centres participated. Patients undergoing primary liver transplantation were randomly assigned intraoperative high-dose aprotinin, regular-dose aprotinin, or placebo. Primary endpoints were intraoperative blood loss and transfusion requirements. Secondary endpoints were perioperative fluid requirements, postoperative blood transfusions, complications, and mortality.

Findings: 137 patients received high-dose aprotinin (n=46), regular-dose aprotinin (n=43), or placebo (n=48). Intraoperative blood loss was significantly lower in the aprotinin-treated patients, with a reduction of 60% in the high-dose group and 44% in the regular-dose group, compared with the placebo group (p=0.03). Total amount of red blood cell (homologous and autologous) transfusion requirements was 37% lower in the high-dose group and 20% lower in the regular-dose group, than in the placebo group (p=0.02). Thromboembolic events occurred in two patients in the high-dose group, none in the regular-dose group, and in two patients in the placebo group (p=0.39). Mortality at 30 days did not differ between the three groups (6.5%, 4.7%, and 8.3%; p=0.79).

Interpretation: Intraoperative use of aprotinin in adult patients undergoing orthotopic liver transplantation significantly reduces blood-transfusion requirements and should be routinely used in patients without contraindications.