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- W2437644823 abstract "We investigated the effect of oral anticoagulation on thrombogenesis induced by the subendothelium of rabbit aorta. Eighteen healthy volunteers underwent a 2-week treatment with the oral coumarin preparation phenprocoumon to a target international normalized ratio (INR) of 5. By using an ex-vivo perfusion chamber system, the interaction between flowing blood and exposed subendothelium was measured at low (50 sec-1) and high (650 sec-1) wall shear rates. The low shear rate simulated blood flow in venous vessels and the high shear rate simulated blood flow in arterial vessels. Deposition of fibrin, platelets, and platelet thrombi on subendothelium was quantified by morphometric and immunologic techniques. Fibrin deposition prevailed at the low shear rate (183 +/- 57 ng/mm2 vs 46 +/- 16 ng/mm2, low vs high shear rate; mean +/- SEM; p less than 0.01). In contrast, the interaction of platelets with subendothelium was more intense at high shear rates when compared with low shear rates, as indicated by higher platelet adhesion (44% +/- 2% vs 9% +/- 1% coverage of subendothelium with platelets, p less than 0.001) and platelet thrombus volumes (3.6 +/- 0.4 microns 3/microns 2 vs 1.3 +/- 0.3 microns 3/microns 2, p less than 0.001). Fibrin deposition on subendothelium was substantially reduced even at a low intensity of anticoagulation (reduction by 60% at INR 2.1 and by 75% at INR 3.7) and was abolished after high coumarin doses (INR 5.2). In contrast, a significant inhibition of platelet thrombus formation could be achieved only by high doses of phenprocoumon (INR 5.2). Our data indicate that relatively low doses of oral anticoagulants (INR between 2 and 3.5) substantially inhibit the fibrin formation on subendothelium prevailing at venous shear conditions, whereas a high intensity of anticoagulation (INR 4 to 5) is necessary to inhibit the formation of platelet-rich thrombi prevailing at arterial shear conditions." @default.
- W2437644823 created "2016-06-24" @default.
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- W2437644823 date "1991-09-01" @default.
- W2437644823 modified "2023-09-23" @default.
- W2437644823 title "Effects of the oral anticoagulant phenprocoumon on blood coagulation and thrombogenesis induced by rabbit aorta subendothelium exposed to flowing human blood: role of dose and shear rate." @default.
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