Disappearance of Factor V Activity after Incubation of Plasma with Heparin and Heparinoids

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Abstract
1. Heparin and heparinoids, added to oxalated or citrated plasma produce in this plasma an inactivation of factor V; this inactivation is progressive and directly related to the length of incubation. The rate of inactivation of factor V is directly proportional to the quantity of anticoagulant added. 2. When quantities with identical anticoagulant activity in the thromboplastin-calcium clotting time are compared, heparin proves to have a stronger effect than heparinoids. 3. The inactvation of factor V in plasma by heparin or heparinoïds is an irreversible process, which cannot be nullified by addition of protamine sulphate. * Supported by grant-in-aid of the Fonds de la Recherche Clinique Médicale. ** Associé du Fonds National de la Recherche Scientifique.