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Evaluation of the inhibition by heparin and hirudin of coagulation
activation during r-tPA-induced thrombolysis
M Mirshahi, J Soria, C Soria, R Faivre, H Lu, M Courtney, C Roitsch, D Tripier and JP Caen
Institut des vaisseaux et du sang (IVS), Hopital Lariboisiere, Paris, FRG.
Thrombin bound to a fibrin clot remains active and poorly accessible to
heparin-AT III complex. During fibrinolysis, thrombin is released as
thrombin-FDP complex and is inactivated by heparin-AT III. However, as
successive fibrin layers are removed, inaccessible molecules of thrombin
are exposed at the surface of the residual clot, possibly contributing to
the occurrence during thrombolytic therapy of coagulation that is poorly
controlled by heparin. We have investigated the accessibility of
fibrin-bound thrombin to hirudin. The results clearly show that two
recombinant hirudin variants neutralize thrombin both in solution and
fibrin bound. Furthermore, we have found that in in vitro models, hirudin
present in the surrounding medium of a clot under lysis is more efficient
than heparin in preventing the activation of coagulation. This observation
suggests that hirudin may be effective in the prevention of the
rethrombotic process frequently encountered during thrombolytic therapy.
Volume 74,
Issue 3,
pp. 1025-1030,
08/15/1989
Copyright © 1989 by The American Society of Hematology

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