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Monocyte tissue factor-like activity in post myocardial infarction patients
J C Freeburn1, J M Wallace, J J Strain
1Northern Ireland Centre for Diet and Health, University of Ulster, Coleraine.
Insights
Patients who experienced myocardial infarction (MI) showed higher procoagulant activity in monocytes and elevated levels of certain blood factors. This suggests an increased risk for future cardiovascular events.
Area of Science:
- Cardiovascular Medicine
- Hematology
- Immunology
Background:
- Thrombosis is a critical factor in the progression of vascular disease to acute ischemic syndromes like myocardial infarction (MI) and stroke.
- Understanding the hemostatic system's role in coronary heart disease (CHD) is crucial for managing patient outcomes.
Purpose of the Study:
- To investigate the relationship between specific hemostatic factors and coronary heart disease.
- To compare procoagulant activity (PCA) in monocytes and neutrophils between post-MI patients and healthy controls.
Main Methods:
- A case-control study involving 21 male patients post-MI and age-matched controls.
- Assessed procoagulant activity (PCA) of peripheral monocytes and polymorphonuclear neutrophils.
- Measured plasma levels of total factor VII, fibrinogen, tissue factor pathway inhibitor (TFPI), D-dimers, tissue plasminogen activator (t-PA), plasminogen activator inhibitor-1 (PAI-1), tumor necrosis factor-alpha (TNF-alpha), and performed full blood counts.
Main Results:
- Post-MI patients exhibited significantly higher monocyte PCA compared to controls.
- Elevated plasma concentrations of TFPI, fibrinogen, and t-PA were observed in the post-MI group.
- Increased total white blood cell and neutrophil counts were also noted in patients who had experienced MI.
Conclusions:
- The findings indicate an elevated procoagulant state in patients following myocardial infarction.
- This procoagulant state may contribute to disease exacerbation and elevate the risk of subsequent acute ischemic events.
Abstract:
It is widely recognized that thrombosis is the major event in the evolution of stable vascular disease to unstable ischaemic syndromes including myocardial infarction and stroke. The purpose of this case-control study was to establish clinical and laboratory data on the possible relationship between specific components of the haemostatic system and coronary heart disease. The procoagulant activity (PCA) of peripheral monocytes and polymorphonuclear neutrophils was assessed in 21 males who had suffered a myocardial infarction (MI) and in age-matched controls. In addition, total factor VII activity, fibrinogen, tissue factor pathway inhibitor (TFPI). D-dimers, tissue plasminogen activator (t-PA), plasminogen activator inhibitor (PAI-1), tumour necrosis factor-alpha (TNF-alpha) and full blood counts were measured. Post MI patients had significantly higher monocyte PCA, higher plasma concentrations of TFPI, fibrinogen, t-PA, T/P100 and also higher total white blood cell and neutrophil counts compared to age-matched controls. This elevated procoagulant state in post MI patients could further exacerbate the disease process and increase the risk of subsequent acute ischaemic events.