We examined the intra- and postoperative behavior of antithrombin III (AT),
factor V, VIII, and fibrinogen in 27 elective surgical patients without evidence of disseminated
intravascular coagulation (DIC) and treated according to the concept of blood component
therapy inaugurated at our hospital in 1975. The intraoperative depletions of AT and
fibrinogen were proportional to the transfusion volumes and correlated significantly. AT,
fibrinogen, and especially factor V and VIII were significantly mobilized during surgery. A
greater intraoperative depletion of AT was significantly associated with a faster recovery
during the first 24 postoperative h. The AT activity was virtually stable over a period of
4 weeks in CPD-adenine red cell concentrates ; fresh frozen plasma and whole blood are thus
not essential as a source of AT. The application of our concept did not increase the frequency
of thromboembolic complications, despite the fact that the intraoperative AT values fell
below the presumed ‘critical’ level of 60-70% in some patients. The probable reasons are the
brief duration of such levels, the simultaneous depletion of coagulation-promoting plasma
constituents (e.g. fibrinogen), and the use of antithrombotic prophylaxis. Our results suggest
no reasons for a routine use of fresh frozen plasma in patients with a loss and replacement of
less than about 75% of their blood volume.