The activity of the extrinsic pathway inhibitor (EPI), which is the factor-Xa-dependent inhibitor of the factor Vila-tissue thromboplastin complex, was serially determined in 13 patients with postoperative/posttraumatic septicemia, and compared to the activity of antithrombin (AT), heparin cofactor II and protein C (PC). In the survivors (n = 8), initial low values for all the inhibitors normalized during recovery. In the demises (n = 5), a progressive increase in EPI activity was observed until death, whereas progressive decreases were observed for the other inhibitors. No correlation was found between the inhibitor values and the endotoxin concentration. We conclude that EPI activities are increased in the late course of fatal septicemia. Apparently, a large EPI-AT gap is a severe prognostic indicator in such patients.

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