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Measures of blood pressure and myocardial infarction in treated hypertensive patients
1Department of Epidemiology and Social Medicine, Albert Einstein College of Medicine, New York 10461, USA.
Insights
Pulse pressure, the difference between systolic and diastolic blood pressure, is a key indicator for identifying hypertensive patients at high risk of myocardial infarction. This finding aids in early risk stratification for cardiovascular events.
Area of Science:
- Cardiology
- Hypertension Research
- Epidemiology
Background:
- Hypertension is a major risk factor for cardiovascular diseases, including myocardial infarction.
- Identifying specific blood pressure parameters that predict myocardial infarction risk in treated hypertensive patients is crucial for effective management.
Purpose of the Study:
- To determine entry characteristics associated with subsequent myocardial infarction in treated hypertensive patients.
- To evaluate the predictive value of different blood pressure measures for myocardial infarction risk.
Main Methods:
- A nested case-control and cohort study design was employed.
- 5730 participants from a hypertension control program were analyzed.
- Univariate and multivariate analyses, including logistic regression, were used to assess risk factors.
Main Results:
- Higher cholesterol and a history of diabetes were associated with myocardial infarction in univariate analysis.
- Initial systolic blood pressure and pulse pressure were significantly higher in myocardial infarction cases.
- Initial pulse pressure emerged as the sole independent predictor of myocardial infarction after multivariate adjustment.
Conclusions:
- Elevated pulse pressure is a powerful, independent predictor of subsequent myocardial infarction in hypertensive individuals.
- Measuring pulse pressure at baseline can help identify high-risk patients for targeted interventions.
- This finding emphasizes the importance of pulse pressure in cardiovascular risk assessment for hypertensive populations.
Objective:
To identify entry characteristics associated with subsequent myocardial infarction in treated hypertensive patients.
Design:
Nested case-control study and cohort study.
Setting And Patients:
The 5730 participants (mean age 53 years; 61% male and 45% Caucasian) were selected from a worksite-based, union-sponsored, systematic hypertension control program from 1973 to 1992.
Methods:
In the case-control study myocardial infarction cases were matched by age, sex, year of entry to the program, years of follow-up and previous treatment status (treated or untreated) with non-event subjects. Baseline clinical and biochemical characteristics were analyzed with regard to the outcome of myocardial infarction, using univariate and multivariate analyses, respectively, in case-control and cohort studies.
Results:
During 5.43 years of follow-up the incidence of myocardial infarction was 6.75/1000 person-years. Univariate analysis indicated that myocardial infarction cases had higher cholesterol level and were more likely to have a previous history of diabetes than controls. The initial systolic blood pressure and pulse pressure of cases were significantly higher than in controls. Logistic regression models indicated that initial pulse pressure, either as a continuous or as a categorical variable, was the only measure of blood pressure independently associated with myocardial infarction after adjustment for other risk factors. Analysis of the experience of the total 5730 as well as 2445 previously untreated patients with a cohort study generated identical results.
Conclusion:
A large pulse pressure difference appears to be the most powerful measure available of initial blood pressure to identify, in advance, those hypertensive patients at greatest risk for a subsequent myocardial infarction.
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