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Plasma concentrations of tissue-type plasminogen activator (t-PA), plasminogen activator inhibitor type 1 (PAI-1), and D-dimer were investigated in 50 patients treated intravenously for acute myocardial infarction with either streptokinase (n = 23), urokinase (n = 17), or recombinant t-PA (rt-PA, n = 10). The fibrinolytic variables were measured by enzyme immunoassay on admission; 1, 2, 4, 6, 8, 12, and 24 h later; and then daily until day 7 after admission. In each subgroup of patients treated with different thrombolytic agents, PAI-1 increased significantly (P &amp;lt;0.01) ∼3 h after cessation of thrombolytic therapy. PAI-1 peak concentrations did not differ significantly (P = 0.82) among these three subgroups. t-PA and D-dimer did not differ significantly (P &amp;gt;0.14) among subgroups except for higher t-PA in the rt-PA group attributable to detection of the therapeutically administered exogenous rt-PA by the t-PA assay. Our findings demonstrate a marked PAI-1 increase after thrombolytic therapy for acute myocardial infarction, which seems to be a common, drug-independent antifibrinolytic rebound phenomenon in response to thrombolytic treatment.

clinical chemistry

Rebound increase of plasminogen activator inhibitor type 1 after cessation of thrombolytic treatment for acute myocardial infarction is independent of type of plasminogen activator used