Disseminated intravascular coagulation and hemorrhage in hemophilia B following elective surgery.

Two patients with hemophilia B are described in whom disseminated intravascular coagulation (DIC) developed following infusion of repeated doses of Factor IX concentrate in the perioperative period. In both cases the surgery was elective, Factor IX survival studies had been done to assure proper dosing, and Factor IX levels were monitored daily. Neither patient had clinically significant liver disease. The DIC manifested itself as excessive blood loss from surgical drains without documented thrombosis and was accompanied by prolonged coagulation times, increased fibrin split products and decreased fibrinogen and platelets. In both patients the process was quickly reversed with administration of fresh frozen plasma, cryoprecipitate, and the addition of heparin to the Factor IX concentrate. These cases highlight the difficulty in managing patients with hemophilia B undergoing surgical procedures due to the potential thrombogenicity of the currently available concentrates, and the importance of differentiating the bleeding associated with DIC from underdosing with Factor IX. Furthermore, the potential complications associated with the presently available Factor IX concentrates stress the need for the development of purer, safer Factor IX concentrates.