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- W89711673 abstract "Suspensions of platelet-rich plasma (PRP) or gel-separated platelets (GSP) can be used to evaluate clot retraction subsequent to platelet aggregation and fibrin formation. PRP (200,000 per cubic millimeter) or GSP (200,000 or 100,000 per cubic millimeter) are diluted 1:10 (PRP) or 1:8 (GSP) in phosphate buffer, pH 7.4, and clotted with a high concentration (2.5 U. per milliliter) of thrombin. Human fibrinogen (25 mg. per cent) is added to GSP prior to dilution. Clot retraction is 91 to 100 per cent completed in 1 hour and is quantified by measurement of residual fluid volume. Test conditions are unfavorable for fibrinolysis. Very low concentrations of fibrin/fibrinogen degradation products D and E are detected in residual fluid, and no erythrocyte fall-out occurs. Furthermore, the extent of retraction in the dilute systems is related only to platelet numbers and platelet function. The dilute PRP and GSP methods allow evaluation of clot retraction in the presence of PGE1, the most potent inhibitor of platelet aggregation induced by conventional concentrations of collagen, ADP, epinephrine, and thrombin (0.1 to 0.5 U. per milliliter). High concentrations of PGE1 (to 6 x 10(-6) M) do not inhibit aggregation of GSP, fibrin formation, or platelet-fibrin interaction induced by 2.5 U. per milliliter of thrombin. In contrast, PGE1 concentrations as low as 1.5 to 3.0 x 10(-8) M inhibit clot retraction in both the dilute PRP and GSP systems. Thus, using dilute PRP or GSP the effects of platelet aggregation inhibitors on clot retraction can be determined independently of effects on platelet aggregation." @default.
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- W89711673 date "1976-01-01" @default.
- W89711673 modified "2023-09-27" @default.
- W89711673 title "Clot retraction: evaluation in dilute suspensions of platelet-rich plasma and gel-separated platelets." @default.
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