Early identification of acute myocardial infarction by activated protein C-protein C inhibitor complex.

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Introduction: Increased coagulation activity due to coronary thrombosis in a ruptured plaque should result in activation of the protein C anticoagulant system with formation of complexes between activated protein C (APC) and,the protein C inhibitor (PCI), which reflects coagulation activity. We hypothesized that elevated APC-PCI concentration might allow earlier detection of ongoing myocardial infarction than traditional biochemical markers. We have evaluated a newly devised immunofluorimetric assay for measuring plasma concentration of APC-PCI complexes among patients with suspected acute coronary syndrome. Materials and methods: Blood samples were taken from 340 patients (median 71 years, range 31-97) with suspected acute coronary syndrome at first presentation in the emergency department. Electrocardiogram was recorded and APC PCI, Troponin I and Creatine kinase-MB concentrations were repeatedly measured 3 times at 6 h interval. Results: The 74 patients who were eventually diagnosed with myocardial infarction had a higher median level of APC-PCI complex than those Without myocardial damage; 0.27 vs. 0.20 mu g/L (p = 0.001). In a multivariate regression model, APC-PCI level in the fourth quartile (> 0.32 mu g/L) independently predicted myocardial infarction with an odds ratio of 3.7 (95% CI 1.4-9.6, p < 0.01). Conclusion: Early APC-PCI elevation can be detected among patients with a normal first Troponin I and non-ST-elevation myocardial infarction and provides additional risk assessment in acute coronary syndrome. (c) 2005 Published by Elsevier Ltd.
Original languageEnglish
Pages (from-to)213-219
JournalThrombosis Research
Issue numberAug 10
Publication statusPublished - 2006

Subject classification (UKÄ)

  • Cardiac and Cardiovascular Systems


  • protein C inhibitor
  • myocardial infarction
  • coagulation activity
  • activated protein C


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