Antithrombotic effects of heparin and related agents.

Native heparin was very effective in models of arterial and venous thrombosis as well as in a model demonstrating the effect on endothelial stability in rats. The effect on venous thrombosis was particularly prominent. The activities of LMW-heparin were about the same in all three models, the absolute effective dose against arterial thrombosis being much lower than with native heparin. A heparan sulfate-related preparation (suleparoide) was much less effective in both thrombosis models, especially in the venous one, while the activity was most specifically directed to the maintenance of endothelial stability.