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Trends in coronary heart disease in Queensland, 1971-1980. An interpretation
1Dept. of Social and Preventive Medicine, U. of Queensland, Herston, Australia.
Insights
Coronary heart disease mortality declined significantly in Queensland, Australia, between 1971-1980. This improvement in cardiovascular health was likely due to both reduced disease incidence and enhanced medical care.
Area of Science:
- Cardiovascular epidemiology
- Public health research
- Health services analysis
Background:
- Coronary heart disease (CHD) remains a significant public health concern.
- Understanding trends in CHD mortality and care is crucial for effective health strategies.
Purpose of the Study:
- To analyze changes in CHD mortality, case fatality, and hospitalizations in Queensland from 1971 to 1980.
- To investigate contributing factors to observed trends in CHD outcomes.
Main Methods:
- Utilized routine mortality and hospital activity data for Queensland.
- Analyzed age-adjusted rates for acute myocardial infarction (ICD 410) and other ischemic heart disease (ICD 411-414).
- Examined trends in total mortality, in-hospital mortality, out-of-hospital deaths, case fatality ratios, and admission rates.
Main Results:
- Age-adjusted CHD mortality decreased by approximately 25% in both men and women.
- Case fatality ratios for acute myocardial infarction fell by 29% in both sexes.
- Admission rates for acute myocardial infarction decreased, while rates for other ischemic heart disease increased in men.
Conclusions:
- The decline in CHD mortality suggests contributions from both reduced disease incidence and improved medical care.
- Fewer deaths occurring out of hospital indicate a potential decrease in disease incidence.
- Further research is needed to precisely quantify the impact of incidence versus care improvements.
Abstract:
Routine data on mortality and hospital activity were used to estimate changes in coronary heart disease mortality, case fatality, and hospitalizations in the Australian state of Queensland over the decade 1971-1980. Acute myocardial infarction (International Classification of Diseases (ICD) 410) and other ischemic heart disease (ICD 411-414) were considered separately. For acute myocardial infarction, age-adjusted total mortality declined by about one fourth in both men and women; in-hospital mortality decreased somewhat more and deaths out of hospital correspondingly less. The age-adjusted case fatality ratio fell by the same amount (29%), in both sexes. Similar trends occurred at all ages. Admission rates decreased 11% in men and 18% in women. Similar patterns were evident for other ischemic heart disease except for admissions, which rose 23% among men and remained at the same level in women. These findings suggest that both declining incidence, particularly in the form of fewer deaths out of hospital, and improvements in care may have contributed to the general decline in coronary heart disease mortality in this community. Without direct measures of incidence or changing disease severity, the relative contributions of each factor cannot be examined.