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Pathogenesis and prevalence of atherosclerosis in hypertensive patients
1Department of Geriatrics, Uppsala University, Sweden.
Insights
Atherosclerosis complications like stroke and heart attack have varying risk factors. Hypertension significantly impacts stroke risk, while smoking is key for intermittent claudication. Myocardial infarction risk is multifactorial and influenced by other conditions.
Area of Science:
- Cardiovascular Medicine
- Epidemiology
- Public Health
Background:
- Atherosclerosis is a significant vascular disease with diverse complications, including myocardial infarction, stroke, and intermittent claudication.
- Risk factor patterns for these complications differ across the cardiovascular tree, necessitating targeted prevention strategies.
- International variations in complication prevalence highlight the complex interplay of genetic and environmental factors.
Purpose of the Study:
- To investigate the differential risk factor patterns associated with various atherosclerosis complications.
- To explore the geographical variations in atherosclerosis complication prevalence and their underlying causes.
- To analyze the impact of hypertension and other risk factors on myocardial infarction and stroke incidence.
Main Methods:
- Prospective cohort studies were analyzed to identify risk factor patterns.
- Comparative epidemiological analysis was conducted across different countries and populations.
- Statistical methods were employed to determine the relative importance of risk factors for specific complications.
Main Results:
- Hypertension is the primary risk factor for stroke, while smoking is dominant for intermittent claudication.
- Myocardial infarction exhibits a multifactorial risk profile, with no single factor being statistically predominant.
- Geographical variations exist, with Japan showing high stroke and hypertension rates but low myocardial infarction rates, suggesting other factors like hypercholesterolemia are crucial.
Conclusions:
- The relative importance of risk factors for atherosclerosis complications varies significantly.
- Hypertension's impact on myocardial infarction is modulated by other risk factors, such as hypercholesterolemia.
- Public health interventions targeting specific risk factors can lead to differential reductions in atherosclerosis complication incidence, as observed with stroke reduction in the US and Sweden.
Abstract:
Atherosclerosis is important because of its complications that include, for example, myocardial infarction, angina pectoris, stroke, aortic aneurysm, and intermittent claudication. Prospective studies have indicated that the risk-factor patterns for these complications are different in various parts of the cardiovascular tree. For stroke, hypertension is quantitatively the most important risk factor whereas, for intermittent claudication, smoking appears to be by far the most important risk factor. Myocardial infarction, however, is a complication for which a large number of risk factors emerge and none appears to be more important, at least from the statistical point of view, than the others. The prevalence of the different types of complications of atherosclerosis varies considerably among countries. Despite a high prevalence of stroke in Japan and a prevalence of hypertension equal to that in the United States, the prevalence of myocardial infarction is low. This indicates that the importance of hypertension as a risk factor for myocardial infarction is dependent on the presence of other risk factors, such as hypercholesterolemia. In the United States and several European countries, for instance Sweden, there has been a dramatic reduction in the yearly incidence of stroke since the beginning of the 1950s. The time sequence for this change and the change in the number of patients treated for hypertension have been similar in both the United States and Sweden. In contrast, the decrease in the incidence of myocardial infarction began about 15 years later in Sweden than in the United States. In Sweden, the reduced incidence of stroke can be explained by the reduction in the incidence of hemorrhagic stroke only.(ABSTRACT TRUNCATED AT 250 WORDS)