Thromb Haemost 1960; 4(03): 303-322
DOI: 10.1055/s-0038-1654512
Originalarbeiten — Original Articles — Travaux Originaux
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Disappearance of Factor V Activity after Incubation of Plasma with Heparin and Heparinoids[*]

R Holemans
1   Laboratory of Physiopathology of the Department of Medicine (Prof. J. Vandenbroucke), University of Louvain, Belgium
,
C Vermylen
1   Laboratory of Physiopathology of the Department of Medicine (Prof. J. Vandenbroucke), University of Louvain, Belgium
,
M Verstraete**
1   Laboratory of Physiopathology of the Department of Medicine (Prof. J. Vandenbroucke), University of Louvain, Belgium
› Author Affiliations
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Publication History

Publication Date:
17 June 2018 (online)

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Summary

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.