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- W2401049215 abstract "Thrombotic thrombocytopenic purpura (TTP) is characterized by widespread occluding and persistent microthrombotic lesions. Evidence for both endothelial damage and primary platelet aggregation as possible pathogenetic mechanisms has been produced. Persistence of microthrombi has not been explained satisfactorily. In patients with TTP we studied plasma fibrinolysis and protein C. Tissue plasminogen activator (t-PA) activity levels, measured functionally, were low or unmeasurable in 11 of 12 patients; t-PA antigen levels, measured immunochemically, were normal in all six observed. The level of potent inhibitor of plasminogen activation directed against both t-PA and urokinase was elevated significantly in all 12, whereas the alpha 2-antiplasmin level was elevated in only two. Protein C antigen levels were low in three of six patients observed. Fibrinolysis levels in patients in remission did not differ from those in patients with acute disease. Plasma exchange resulted in temporary reversal of the abnormalities, but achievement of clinical remission was not associated with permanent normalization of fibrinolysis. Inasmuch as all 12 patients had severely depressed fibrinolytic mechanisms it is possible that a defect in the fibrin-clearing system permits thrombus formation to occur and proceed in an unchallenged fashion, thereby contributing to the complex events leading to arterial ischemia in vital organs." @default.
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- W2401049215 date "1986-11-01" @default.
- W2401049215 modified "2023-09-23" @default.
- W2401049215 title "Fibrinolysis in health and disease: abnormal levels of plasminogen activator, plasminogen activator inhibitor, and protein C in thrombotic thrombocytopenic purpura." @default.
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