title: The influence of acute-phase levels of haemostatic factors on reperfusion and mortality in patients with acute myocardial infarction treated with streptokinase.
abstract: BACKGROUND
  The fibrinolytic system and von Willebrand factor (vWF) have been shown to play a role as risk factors for myocardial infarction. We performed this prospective cohort study to determine if components in the fibrinolytic system or vWF before or during treatment of AMI with streptokinase (SK) could predict reperfusion, recurrent ischaemia, reinfarction or mortality at one year, or mortality at five years. Reperfusion and recurrent ischaemia were assessed by continuous vectorcardiography. The setting was Umeå university hospital and Skellefteå county hospital, Sweden.
  
  
  RESULTS
  139 patients were included; successful reperfusion was obtained in 53%. tPA activity, PAI-activity, PAI-mass concentration and vWF were analysed immediately on arrival and after 4 and 10 h. High fibrinolytic activity, measured as tPA activity > 25 U/L after the start of treatment, was associated with reperfusion. No significant associations between pre-treatment levels of the fibrinolytic variables or vWF and reperfusion or recurrent ischaemia were found. Elevated levels of PAI-1 mass concentration and PAI-1 activity after the start of SK treatment were associated with a higher risk for death at one year, but not at five years. High levels of vWF were associated with worse prognosis but not when corrected for age.
  
  
  CONCLUSIONS
  Pre-treatment levels of PAI-1, vWF and tPA activity showed no association with reperfusion or recurrent ischaemia. Elevated levels of PAI-1 activity after the start of treatment were associated with worse prognosis.
authors.affiliation: Department of Cardiology, Heart Centre, University Hospital, Umea 901 85, Sweden. johan.nilsson@medicin.umu.se
authors.forename: Johan B
authors.initials: JB
authors.lastname: Nilsson
authors.forename: Kurt
authors.initials: K
authors.lastname: Boman
authors.forename: Jan-Håkan
authors.initials: JH
authors.lastname: Jansson
authors.forename: Torbjörn
authors.initials: T
authors.lastname: Nilsson
authors.forename: Ulf
authors.initials: U
authors.lastname: Näslund
mesh_terms: D000368:Aged; D015415:Biomarkers / Q000097:blood; D005260:Female; D005343:Fibrinolytic Agents / Q000627:therapeutic use*; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000188:drug therapy*; D015425:Myocardial Reperfusion; D017395:Plasminogen Activator Inhibitor 1 / Q000097:blood; D011446:Prospective Studies; D013300:Streptokinase / Q000627:therapeutic use*; D016019:Survival Analysis; D010959:Tissue Plasminogen Activator / Q000097:blood; D014672:Vectorcardiography; D014841:von Willebrand Factor / Q000378:metabolism
chemical_list: D015415:Biomarkers; D005343:Fibrinolytic Agents; D017395:Plasminogen Activator Inhibitor 1; C051321:SERPINE1 protein, human; D014841:von Willebrand Factor; D013300:Streptokinase; D010959:Tissue Plasminogen Activator