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Clinical and biochemical factors associated with prognosis after myocardial infarction at a young age
K Malmberg1, P Båvenholm, A Hamsten
1Department of Cardiology, Karolinska Hospital, Karolinska Institute, Stockholm, Sweden.
Insights
Young men experiencing myocardial infarction face poor long-term outcomes due to high triglycerides, impaired fibrinolysis, and severe coronary artery disease. These factors significantly increase the risk of recurrent cardiac events and mortality in this demographic.
Area of Science:
- Cardiology
- Vascular Biology
- Metabolic Syndrome
Background:
- Young postinfarction patients often exhibit risk factors like heavy smoking, dyslipoproteinemias (VLDL, LDL, HDL), family history, hyperinsulinemia, and defective fibrinolysis.
- The long-term prognostic impact of these specific features in men under 45 post-myocardial infarction remains largely uncharacterized.
Purpose of the Study:
- To investigate the influence of metabolic disturbances, hemostatic function, coronary artery disease severity, and left ventricular function on the long-term prognosis of men under 45 years old following a myocardial infarction.
Main Methods:
- Prospective cohort study involving 108 unselected, nondiabetic men with a first myocardial infarction before age 45.
- Assessment of hemostatic function, metabolic indicators, and angiographic risk factors.
- Follow-up for 6 to 9 years to track reinfarction, cardiac death, and major coronary events.
Main Results:
- Very low-density lipoprotein (VLDL) and global coronary atherosclerosis score predicted reinfarction.
- Plasma plasminogen activator inhibitor-1 (PAI-1) activity and global coronary stenosis score predicted cardiac death.
- VLDL triglyceride levels, global coronary atherosclerosis score, and age predicted any major coronary event.
Conclusions:
- Hypertriglyceridemia, impaired fibrinolytic capacity (elevated PAI-1), and extensive coronary artery disease are significant risk factors for recurrence in young men post-myocardial infarction.
- These factors contribute to a poorer long-term prognosis in this patient population.
- Early identification and management of these risk factors are crucial for improving outcomes in young men after myocardial infarction.
Objectives:
This study examined the effect of metabolic disturbances, hemostatic function, coronary artery disease severity and left ventricular function on the long-term prognosis after myocardial infarction in men < 45 years old.
Background:
Heavy smoking; dyslipoproteinemias involving very low density lipoprotein (VLDL), low density lipoprotein (LDL) and high density lipoprotein (HDL); a family history of premature coronary artery disease; hyperinsulinemic responses to oral and intravenous glucose challenges; and defective fibrinolytic function characterize the young postinfarction patient, but the influence of these features on the long-term prognosis is virtually unknown.
Methods:
Measurements of hemostatic function and metabolic and angiographic indicators of risk were included in a prospective cohort study of variables predictive of reinfarction, cardiac death and major coronary events within 6 to 9 years in 108 unselected nondiabetic men with a first myocardial infarction before age 45 years.
Results:
During follow-up, 20 patients had sudden cardiac death, and 53 had a major coronary event (reinfarction, sudden cardiac death, bypass surgery or intervention by catheterization). In multivariate analysis, VLDL and global coronary atherosclerosis score predicted reinfarction; plasma plasminogen activator inhibitor-1 (PAI-1) activity and global coronary stenosis score predicted cardiac death; and VLDL triglyceride levels, global coronary atherosclerosis score and age predicted any major coronary event.
Conclusions:
This prospective cohort study shows that hypertriglyceridemia, impaired fibrinolytic capacity secondary to plasma PAI-1 activity elevation and extensive coronary artery disease increase the risk of recurrences in men with a first myocardial infarction before age 45 and contribute to the relatively poor long-term prognosis in this patient group.