Myocardial ischaemia, risk factors and death from coronary heart-disease
Insights
Early signs of myocardial ischemia significantly predict coronary heart disease death in male civil servants, independent of primary risk factors. This finding is crucial for intervention strategies.
Area of Science:
- Cardiovascular Epidemiology
- Occupational Health
- Preventive Cardiology
Background:
- The Whitehall Study investigated health outcomes in British civil servants.
- Coronary heart disease (CHD) remains a leading cause of mortality.
- Understanding predictive factors for CHD is vital for public health.
Purpose of the Study:
- To assess the predictive power of early myocardial ischemia indicators for CHD mortality.
- To determine the relationship between suspect ischemia and primary coronary risk factors.
Main Methods:
- Analysis of 5-year mortality follow-up data from 18,403 male civil servants (aged 40-64).
- Initial screening included questionnaires and electrocardiography to identify suspect myocardial ischemia.
- Comparison of CHD death rates based on the presence of suspect ischemia and primary risk factors.
Main Results:
- 277 deaths from CHD occurred during the follow-up period.
- Half of CHD deaths were in subjects with initial signs of suspect myocardial ischemia.
- Suspect ischemia independently predicted CHD mortality with greater power than primary risk factors.
- The risk of CHD death was substantially higher with suspect ischemia, even at similar levels of primary risk factors.
Conclusions:
- Early detection of myocardial ischemia is a powerful predictor of coronary heart disease mortality.
- Suspect ischemia provides prognostic information beyond traditional risk factors like hypertension and cholesterol.
- Findings support the integration of ischemia screening into cardiovascular risk assessment and intervention planning.
Abstract:
Mortality follow-up is now complete for 5 years in the 18 403 male civil servants aged 40-64 who were examined between 1967-69 in the Whitehall Study of British civil servants. During this period, 277 of them died of coronary heart-disease (C.H.D.); half of these deaths were in subjects in whom the findings at initial screening had suggested early myocardial ischaemia (angina or history of possible infarction according to standard questionnaire, or electrocardiographic evidence of ischaemia). The finding of suspect ischaemia had greater predictive power than the "primary" coronary risk factors, from which it was generally independent. At each level of the primary risk factors, the risk of death from C.H.D. was much greater in the presence of suspect ischaemia; and, with the possible exceptions of glucose tolerance and physical activity, the main risk factors still operated even at the stage of early ischaemia. These findings have implications for future studies of the effects of intervention.
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