Effects of fibrinolytic agents and heparin on blood coagulation in dogs

Abstract
In vitro experiments demonstrated that incubation of dog plasma with Thrombolysin or Actase caused marked falls in factors I, VIII, and IX, a moderate fall in factor V, and the appearance of a heat-labile clot inhibitor. Incubation of dog plasma with streptokinase (SK), staphylokinase, trypsin, bromelain, or dog fibrinolysin in amounts similar to those used in in vivo studies had little effect on these coagulation factors. If the streptokinase concentration were increased 10- to 15-fold results similar to those found with Thrombolysin were observed. Intravenous infusions of Thrombolysin or Actase resulted in marked depressions of factors I, VIII, and V, minimal depressions of factors II, VII, and IX, and the development of a clot inhibitor. Seven dogs who received SK showed no coagulation changes, while three showed moderate fibrinogenolysis and inhibitor formation.

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