Analysis of coagulation and fibrinolysis during intravenous infusion of recombinant human tissue-type plasminogen activator in patients with acute myocardial infarction.
Coagulation and fibrinolysis were studied in patients with acute myocardial infarction during intravenous infusion of recombinant human tissue-type plasminogen activator (rt-PA) (0.75 mg/kg over 90 min, n = 101), streptokinase (1,500,000 IU over 60 min, n = 61), or placebo (n = 40). In the rt-PA group, the plasma level of rt-PA antigen was 1.2 +/- 0.6 micrograms/ml (mean +/- SD) and the euglobulin fibrinolytic activity (EFA) was 910 +/- 735 IU t-PA/ml. In the streptokinase group, the EFA was equivalent to 430 +/- 435 IU t-PA/ml. At the end of the infusion, the plasma fibrinogen level measured with a coagulation rate assay was decreased to 57 +/- 33% of the preinfusion value in the rt-PA group, to 7 +/- 10% in the streptokinase group, and remained unchanged in the placebo group. Fibrinogen-fibrin degradation products increased to 0.75 +/- 0.54 mg/ml in the streptokinase group but to only 0.10 +/- 0.13 mg/ml in the rt-PA group. The plasma levels of alpha 2-antiplasmin, plasminogen, and factor V decreased to between 30% and 45% in the rt-PA group but significantly more in the streptokinase group (to between 15% and 25%). Thus rt-PA induced much less systemic fibrinolytic activation than streptokinase. In the patients who received rt-PA, a weak correlation (r = .21, n = 89, .1 greater than p greater than .05) was found between the extent of fibrinogen breakdown at 90 min and the plasma rt-PA concentration.(ABSTRACT TRUNCATED AT 250 WORDS)
Collen
D
D
Bounameaux
H
H
De Cock
F
F
Lijnen
H R
HR
Verstraete
M
M
D001777:Blood Coagulation; D005165:Factor V / Q000032:analysis; D005340:Fibrinogen / Q000032:analysis; D005342:Fibrinolysis; D006801:Humans; D007263:Infusions, Parenteral; D009203:Myocardial Infarction / Q000188:drug therapy*; D011994:Recombinant Proteins / Q000008:administration & dosage / Q000627:therapeutic use*; D013300:Streptokinase / Q000627:therapeutic use; D010959:Tissue Plasminogen Activator / Q000008:administration & dosage / Q000627:therapeutic use*; D000979:alpha-2-Antiplasmin / Q000032:analysis
D011994:Recombinant Proteins; D000979:alpha-2-Antiplasmin; D005165:Factor V; D005340:Fibrinogen; D013300:Streptokinase; D010959:Tissue Plasminogen Activator