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Risk factors for long-term coronary prognosis after initial myocardial infarction: the Framingham Study
N D Wong1, L A Cupples, A M Ostfeld
1Department of Medicine, University of California, Irvine 92717.
Insights
Standard risk factors like high blood pressure, cholesterol, and diabetes significantly predict long-term recurrent coronary events after myocardial infarction. Managing these factors is crucial for improving survival in heart attack survivors.
Area of Science:
- Cardiology
- Epidemiology
- Public Health
Background:
- Myocardial infarction (MI) survivors face a high risk of recurrent cardiovascular events.
- Identifying long-term prognostic factors is essential for effective secondary prevention strategies.
Purpose of the Study:
- To examine the predictive role of standard coronary heart disease risk factors in long-term recurrent coronary events among MI survivors.
- To identify key determinants of reinfarction and coronary death in this population.
Main Methods:
- Utilized data from the Framingham Heart Study, following 459 myocardial infarction survivors for up to 32 years.
- Employed Cox proportional hazards models to analyze the association between postinfarction risk factors and recurrent events.
Main Results:
- Systolic blood pressure, serum cholesterol, and diabetes were independent predictors of both reinfarction and coronary death.
- Higher relative weight was associated with a lower risk of reinfarction.
- Women showed a lower risk of coronary death compared to men, potentially masked by higher baseline risk factors.
Conclusions:
- Standard risk factors, particularly systolic blood pressure, serum cholesterol, and diabetes, are critical long-term determinants of coronary prognosis post-MI.
- These factors require continued management in MI survivors to prevent subsequent cardiac events.
- A potential survival advantage in women warrants further investigation.
Abstract:
The role of standard coronary heart disease risk factors in predicting the long-term risk of recurrent coronary events in survivors of myocardial infarction is examined. Of 697 subjects (464 males and 233 females) who experienced an initial myocardial infarction during 30 years of follow-up in the Framingham Study, 459 returned for a baseline examination and were followed for up to 32 years (mean = 9.7 years) for incident reinfarction or coronary death. The Cox proportional hazards model was used to evaluate the relation of postinfarction risk factors with reinfarction and coronary death. Age-adjusted analyses showed the risk of reinfarction to be positively associated with blood pressure and serum cholesterol. Risk of coronary death was strongly associated with blood sugar level, systolic blood pressure, serum cholesterol, heart rate, diabetes, and interim reinfarction. In multivariable analyses, systolic pressure, serum cholesterol, and diabetes were predictive of reinfarction; relative weight was inversely associated with reinfarction. Systolic pressure, serum cholesterol, and the prevalence of diabetes persisted as independent predictors of coronary death. When adjustments were made for the effects of these variables, women were at only half the risk of coronary death compared with men. Higher baseline risk factors in women compared with men may obscure an important survival advantage in women. In persons recovered from an initial myocardial infarction, standard risk factors, particularly systolic pressure, serum cholesterol, and diabetes, remain important determinants of coronary prognosis over many years and warrant attention in preventing subsequent events.