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Factors determining case fatality in myocardial infarction "who dies in a heart attack"?
G Wannamethee1, P H Whincup, A G Shaper
1Department of Public Health, Royal Free Hospital School of Medicine, London.
Insights
Physical activity may improve survival after a first heart attack in men. Factors like arrhythmia, diabetes, and hypertension treatment increase fatality risk, while moderate drinking shows no effect on incidence.
Area of Science:
- Cardiology
- Public Health
- Epidemiology
Background:
- Ischaemic heart disease (IHD) remains a leading cause of mortality.
- Understanding factors influencing survival after a first major IHD event is crucial for public health interventions.
Purpose of the Study:
- To identify determinants of case fatality following the first major ischaemic heart disease event in middle-aged men.
- To explore modifiable risk and protective factors for survival after a heart attack.
Main Methods:
- Prospective study involving 7735 middle-aged men from 24 British towns.
- Follow-up period of 11.5 years, recording major IHD events and outcomes.
- Statistical analysis to determine associations between various factors and case fatality.
Main Results:
- 40.6% of 743 major IHD events were fatal within 28 days.
- Previous myocardial infarction or stroke and age were strongly associated with fatality.
- In men without prior events, physical activity and moderate drinking were associated with lower fatality; antihypertensive treatment, arrhythmia, increased heart rate, and diabetes were associated with higher fatality.
- In men with prior events, arrhythmia, antihypertensive treatment, drinking, and diabetes were associated with higher fatality.
Conclusions:
- Physical activity is a potentially important modifiable factor for IHD incidence and survival in men without prior cardiovascular events.
- Arrhythmia, increased heart rate, diabetes, and hypertension treatment warrant attention as risk factors for poor outcomes.
- Moderate alcohol consumption did not reduce IHD incidence but was linked to lower case fatality in some analyses.
Objective:
To examine the determinants of case fatality in the first major ischaemic heart disease event (heart attack) after screening.
Methods:
Prospective study of 7735 middle aged men drawn from general practices in 24 British towns.
Results:
During 11.5 years follow up there were 743 major ischaemic heart disease events of which 302 (40.6%) were fatal within 28 days of onset. Previous definite myocardial infarction or stroke and age at time of event were most strongly associated with case fatality. In men with no previous myocardial infarction or stroke, after adjustment for a range of risk factors, antihypertensive treatment (odds ratio (OR) = 1.97, P < 0.05), arrhythmia (OR = 1.93, P = 0.06), increased heart rate (OR = 2.03, P = 0.06), and diabetes (OR = 2.61, P = 0.07) were associated with increased case fatality. High levels of physical activity (OR = 0.53, P < 0.05) and moderate drinking (16-42 units/week) (OR = 0.61, P < 0.05) were associated with lower case fatality, although moderate drinking was not associated with a lower incidence of major ischaemic heart disease events. Current smoking, serum total cholesterol, and systolic blood pressure were not significantly associated with case fatality. In men with previous myocardial infarction or stroke, arrhythmia and to a lesser degree antihypertensive treatment, moderate or heavy drinking, and diabetes were associated with higher case fatality.
Conclusion:
These findings suggest that physical activity may be an important modifiable factor influencing the incidence of ischaemic heart disease and the chance of survival in men without a previous heart attack or stroke. Arrhythmia, increased heart rate, diabetes, and treatment for hypertension are also areas of concern.