In 38 patients with acute myocardial infarction treated with 1.5 million u. of streptokinase hemocoagulation parameters were assessed before and after treatment and after another 12, 24 and 48 hours. The authors revealed three risk indicators of thrombotic complications: 1. a shortened aPTT before treatment and at the same time a less than double prolongation of aPTT, as compared with control plasma after treatment (P < 0.01, sensitivity 0.67, specificity 0.81). 2. A non-detectable fibrinogen level (less than 1.1 milligrams) 24 hours after termination of treatment (P < 0.05, sensitivity 0.59, specificity 0.71). 3. The third risk factor 3 is a combination of the previous two: shortened aPTT before treatment and at the same time its inadequate prolongation after treatment and/or an undetectable fibrinogen level 24 hours after treatment (P < 0.001, sensitivity 1.00, specificity 0.57). In all the authors' patients with thrombotic complications (reinfarction, recurrent myocardial ischaemia, extended infarction, intracardiac thrombosis, embolization into the CNS) this 3rd combined risk factor was positive.

Keywords: Female; Fibrinogen /analysis/; Humans; Male; Middle Aged; Myocardial Infarction /blood/; Partial Thromboplastin Time; Risk Factors; Thrombolytic Therapy /adverse effects/; Thrombosis /blood/