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Plasminogen activator inhibitor in plasma: risk factor for recurrent myocardial infarction
Insights
Reduced fibrinolytic capacity, indicated by high plasminogen activator inhibitor levels, increases reinfarction risk in young men post-myocardial infarction (MI). This occurs alongside atherogenic factors, coronary lesions, and poor heart function.
Area of Science:
- Cardiology
- Thrombosis Research
- Vascular Biology
Background:
- Younger individuals (<45 years) experiencing a first myocardial infarction (MI) face significant reinfarction risks.
- Understanding predictive factors for recurrent events is crucial for secondary prevention strategies.
- Haemostatic, metabolic, and angiographic variables are potential contributors to reinfarction.
Purpose of the Study:
- To identify variables predictive of reinfarction within 3 years in men under 45 experiencing their first MI.
- To investigate the interplay between fibrinolytic capacity, atherogenic factors, and cardiac function in reinfarction risk.
Main Methods:
- Prospective cohort study involving 109 unselected men with a first MI before age 45.
- Assessment of haemostatic function, metabolic indices (including VLDL and HDL dyslipoproteinaemia, triglycerides), and angiographic data.
- Follow-up for 3 years to record reinfarction events (fatal and nonfatal) and sudden cardiac death.
Main Results:
- High plasma concentrations of plasminogen activator inhibitor (PAI) were independently associated with reinfarction.
- Dyslipoproteinaemia (VLDL, HDL), poor left ventricular function, and multi-vessel coronary artery disease were also independent predictors of reinfarction.
- Elevated triglyceride levels showed a possible link to thrombosis via coexisting high PAI levels.
Conclusions:
- Reduced fibrinolytic capacity, evidenced by increased PAI levels, predisposes to reinfarction in young men post-MI.
- This predisposition results from a complex interaction involving atherogenic factors, extensive coronary lesions, and impaired left ventricular function.
- Targeting PAI levels and managing associated risk factors may be key in preventing recurrent MIs in this population.
Abstract:
Measurements of haemostatic function and metabolic and angiographic indices of risk were included in a prospective cohort study of variables predictive of recurrences within 3 years in 109 unselected men with a first myocardial infarction (MI) before the age of 45. In the course of follow-up, 16 patients had at least one reinfarction (fatal recurrences in 9 and nonfatal in 7) and 1 died suddenly. High plasma concentrations of the fast-acting plasminogen activator inhibitor were independently related to reinfarction along with dyslipoproteinaemia involving VLDL and HDL, poor left ventricular performance, and multiple-vessel coronary artery disease. Besides being independently associated with reinfarction in the present population, high triglyceride levels were possibly connected with a predisposition to thrombosis through a coexisting high level of plasminogen activator inhibitor. The data indicate that reduced fibrinolytic capacity due to increased plasma levels of the plasminogen activator inhibitor predisposes to reinfarction in a complex interplay with atherogenic factors, multiple coronary lesions, and compromised left ventricular function.