Related Experiment Videos
Cardiac failure and sudden death in the Framingham Study
W B Kannel1, J F Plehn, L A Cupples
1Section of Preventive Medicine and Epidemiology, Boston University School of Medicine, MA.
Insights
Cardiac failure significantly increases sudden death risk, especially with co-existing coronary heart disease. Modifiable risk factors and cardiac damage may contribute to this heightened mortality in heart failure patients.
Area of Science:
- Cardiology
- Public Health
- Epidemiology
Background:
- Cardiac failure (heart failure) is a major cause of morbidity and mortality.
- The Framingham Heart Study provides long-term data on cardiovascular disease incidence and outcomes.
- Understanding risk factors and mortality associated with heart failure is crucial for public health.
Purpose of the Study:
- To examine mortality patterns in patients with cardiac failure using Framingham Heart Study data.
- To identify predisposing factors for cardiac failure and their association with sudden death.
- To investigate the underlying causes of increased sudden death risk in heart failure.
Main Methods:
- Analysis of 5209 subjects from the Framingham Heart Study with 30 years of follow-up.
- Examination of cardiac failure incidence, predisposing factors, and mortality, including sudden death.
- Comparison of sudden death rates in heart failure patients versus the general population.
Main Results:
- Cardiac failure incidence doubled with each decade, with a male predominance due to coronary heart disease.
- Sudden death occurred at nine times the general population rate among heart failure patients.
- Hypertension and coronary heart disease were major associations; modifiable risk factors like smoking and obesity were identified.
Conclusions:
- Cardiac failure substantially elevates sudden death risk, independent of traditional risk factors.
- The damaged myocardium or necessary treatments may contribute to the high sudden death rates.
- Further research is needed to elucidate the mechanisms behind this increased risk.
Abstract:
Mortality is examined in patients with cardiac failure in the Framingham study of 5209 subjects. During 30 years of follow-up, the incidence of cardiac failure doubled with each decade of age with a male predominance produced by higher rates of coronary heart disease. Most cardiac failure was associated with hypertension or coronary heart disease. Among 232 men and 229 women in whom cardiac failure developed, sudden death occurred at nine times the general age-adjusted population rate. Cardiac failure alone increased the risk of sudden death fivefold. In those who also had coronary heart disease there was a further doubling of risk. The major predisposing factors for cardiac failure included hypertension, obesity, glucose intolerance, heavy smoking, cardiac enlargement, ECG abnormality, and atrial fibrillation. These were also risk factors for sudden death. These shared modifiable risk factors and cardiac impairments did not entirely account for the markedly increased risk of sudden death in cardiac failure. This suggest that either the damaged myocardium or treatment needed to control the cardiac failure may be at fault.