The very early anticoagulant response was analysed in non-pregnant female New Zealand rabbits infused with rabbit brain tissue thromboplastin for a period of 10 min (n = 6), 20 min (n = 6), and 30 min (n = 6). The rabbits infused with thromboplastin responded with a significant drop in mean arterial pressure (P < 0.05), an increase in blood PaO2 (P < 0.05) and a decrease in PaCO2 (P < 0.05), while control animals remained stable with respect to these variables. The thromboplastin-treated animals had an immediate drop in platelet count (P < 0.05), plasma fibrinogen (P < 0.05) and a prolongation in prothrombin time (P < 0.05) and activated partial thromboplastin time (P < 0.05). The concentrations in a number of proteins involved in the anticoagulant response (antithrombin, plasminogen, antiplasmin) as well as global fibrinolytic activity did not change significantly following 10, 20 and 30 min infusion of thromboplastin, while the concentration of protein C decreased continuously during the infusion periods (P < 0.05) to reach the lowest level (approximately 60%) in animals infused with thromboplastin for 30 min. The animals infused with tissue thromboplastin had microthrombi in 1-6% of the renal glomeruli, but the number of microthrombi did not differ significantly between animals infused for 10, 20 and 30 min. It is concluded that the protein C system may play a key role during the initial phase of intravascular coagulation and immediate activation of protein C may protect against excessive deposition of fibrin.
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