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The changing pattern of heart disease in South African Blacks
Insights
Autopsy data reveals shifts in heart disease among Black South Africans. Hypertensive and rheumatic heart disease remain common, while myocardial infarction incidence significantly increased by 1976.
Area of Science:
- Cardiology
- Public Health
- Epidemiology
Background:
- Heart disease patterns in South African Black populations have historically shown specific trends.
- Understanding these trends is crucial for public health interventions and resource allocation.
Purpose of the Study:
- To analyze changes in the incidence of various heart diseases in Black patients at Baragwanath Hospital between 1959-1960 and 1976.
- To identify significant shifts in the etiological profile of cardiac mortality.
Main Methods:
- Retrospective autopsy review of cardiac deaths in Black patients.
- Data collection from Baragwanath Hospital for the years 1959, 1960, and 1976.
- Categorization of heart disease based on autopsy findings.
Main Results:
- Hypertensive heart disease, primarily from essential hypertension, remained the most common diagnosis.
- Rheumatic heart disease showed high prevalence, affecting young individuals with advanced lesions.
- Myocardial infarction incidence rose significantly from less than 1% in 1959-1960 to nearly 12% in 1976.
- Cardiovascular syphilis incidence dramatically decreased.
Conclusions:
- While hypertensive and rheumatic heart disease remain prevalent, a notable increase in myocardial infarction signifies a changing epidemiological landscape.
- The decline in cardiovascular syphilis suggests successful public health or treatment interventions.
- Ongoing monitoring of cardiac disease trends in this population is essential.
Abstract:
All autopsies on Black patients who died of heart disease at Baragwanath Hospital were examined for the years 1959, 1960 and 1976. The commonest form of heart disease encountered in South African Blacks is undoubtedly hypertensive heart disease and by far the majority of these cases are of essential hypertension. There appears to have been a slight rise in the incidence of hypertension. Rheumatic heart disease is extremely common, and affects young people, who often have advanced valvular lesions by puberty. The incidence of idiopathic cardiomyopathy does not seem to have altered materially, although there has perhaps been a slight drop, which may be accounted for by the tendency of clinicians to place cases of congestive cardiac failure with mild hypertension in the hypertensive group rather than in the idiopathic cardiomyopathy group. There was a significant alteration in the incidence of myocardial infarction; in 1959 and 1960 these cases comprised less than 1% of all cardiac deaths but in 1976 they comprised nearly 12%. There has also been a dramatic fall in the incidence of cardiovascular syphilis.
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