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Sudden death risk in overt coronary heart disease: the Framingham Study
Insights
Sudden cardiac death (SCD) risk is significantly higher in individuals with coronary heart disease (CHD). Despite advances, the proportion of CHD deaths presenting as SCD remains high in those with established CHD.
Area of Science:
- Cardiovascular Epidemiology
- Clinical Cardiology
- Public Health
Background:
- Coronary heart disease (CHD) is a major cause of mortality.
- Sudden cardiac death (SCD) is a significant concern within CHD.
- Understanding risk factors and trends in SCD is crucial for prevention.
Purpose of the Study:
- To analyze long-term trends in sudden death among individuals with and without established coronary heart disease (CHD).
- To identify predictors of sudden death in patients with manifest CHD.
- To assess the impact of CHD on sudden death risk across different demographics and clinical presentations.
Main Methods:
- Longitudinal surveillance of 5127 subjects over 30 years, monitoring for overt CHD and sudden deaths.
- Comparison of sudden death risk between individuals with and without interim CHD events.
- Analysis of specific CHD manifestations (myocardial infarction, angina pectoris) and their association with sudden death.
- Evaluation of demographic factors (age, sex) and clinical predictors (ischemic damage, heart failure).
Main Results:
- Individuals with overt CHD had a 6.7-fold increased risk of sudden death.
- Myocardial infarction, particularly silent infarctions, posed a greater sudden death risk than angina pectoris.
- Sudden death risk was similar for young and old individuals with CHD.
- Approximately 40% of sudden deaths occurred in the 4% of the population with overt CHD.
- The proportion of coronary attacks presenting as sudden death increased with age.
- Despite a national decline in CHD mortality, the proportion of CHD deaths presenting as sudden deaths in those with prior CHD has not declined over three decades.
Conclusions:
- Established CHD significantly elevates the risk of sudden cardiac death.
- Ischemic myocardial damage and cardiac failure are key predictors of sudden death in patients with CHD.
- The persistent high proportion of sudden deaths among those with prior CHD highlights a critical unmet need in cardiovascular care, despite overall reductions in CHD mortality.
Abstract:
Over 30 years of surveillance of 5127 subjects free of CHD, 760 men and 574 women developed overt CHD, and there were 160 sudden deaths in men and 73 in women. Among those who sustained clinically manifest CHD, the sudden death risk was increased 6.7 times that of those without an interim event. Although the relative risk was comparable in the two sexes, CHD did not eliminate the female advantage over men. Myocardial infarction imposed a greater sudden death risk than angina pectoris, and silent infarctions were as dangerous as symptomatic infarctions. Onset of CHD put young and old at equal risk of sudden death. Some 40% of sudden deaths occurred in the 4% of the general population with overt CHD. The proportion of coronary attacks presenting as sudden death increased from 13% at ages 35 to 64 years to 20% at ages 65 to 94 years. The fraction of CHD deaths classified as sudden deaths was lower in those with than without interim CHD. In those with established CHD, factors reflecting ischemic myocardial damage and cardiac failure were the chief predictors of sudden death. The proportion of CHD deaths presenting as sudden deaths has not declined in subjects with prior CHD over three decades, despite a national decline in the overall CHD mortality rate.