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Published on: June 14, 2016
Systemic hypertension, left ventricular hypertrophy and coronary artery disease
J F Tubau1, J Szlachcic, M J London
1Division of Cardiology, Veterans Administration Medical Center, San Francisco California 94121.
Insights
Hypertensive left ventricular hypertrophy increases coronary artery disease (CAD) risk. Early detection of silent CAD in these patients is crucial for effective antihypertensive treatment and reduced mortality.
Area of Science:
- Cardiology
- Hypertension Research
- Vascular Medicine
Background:
- Hypertensive left ventricular hypertrophy (LVH) is linked to reduced coronary vascular reserve and accelerated atherosclerosis.
- This contributes to increased coronary morbidity and mortality in hypertensive individuals with LVH.
- Previous antihypertensive trials have shown limited success in reducing coronary outcomes, highlighting unmet needs.
Purpose of the Study:
- To emphasize the importance of early detection of coronary artery disease (CAD) in hypertensive patients with LVH.
- To discuss a strategy for detecting asymptomatic CAD using combined noninvasive tests.
- To assess the impact of silent ischemia on coronary mortality in antihypertensive trials.
Main Methods:
- Analysis of coronary circulation changes in hypertensive LVH.
- Review of epidemiologic findings on coronary morbidity and mortality.
- Evaluation of a diagnostic strategy combining two noninvasive tests for CAD detection.
- Follow-up of patients with abnormal exercise test results.
Main Results:
- Hypertensive LVH patients showed a 20-30% incidence of abnormal exercise test results.
- Positive exercise tests predicted typical angina development within 3 years.
- Silent ischemia may account for up to 40% of coronary mortality in prior trials.
Conclusions:
- Early detection of asymptomatic CAD in hypertensive patients with LVH is critical.
- Separate follow-up of patients with silent CAD is needed.
- This approach may better elucidate the effects of antihypertensive treatments on coronary outcomes.
Abstract:
The potential mechanisms for the development of myocardial ischemia in hypertensive left ventricular (LV) hypertrophy involve changes in the coronary circulation characterized by a reduction of coronary vascular reserve and an acceleration of the atherosclerotic process. This combination of factors is probably reflected in the epidemiologic findings of increased coronary morbidity and mortality in hypertension, particularly when it is associated with LV hypertrophy. The failure of several antihypertensive trials to reduce coronary morbidity and mortality emphasizes the importance of early detection of significant coronary artery disease (CAD) among hypertensive patients with LV hypertrophy. A strategy to detect asymptomatic CAD based on combined probability of 2 noninvasive tests is discussed. Results obtained in hypertensive LV hypertrophy showed a 20% to 30% incidence of abnormal exercise test results, and these positive findings were predictive for the development of typical angina during a 3-year follow-up. Based on these results and reported data, it is extrapolated that patients with silent ischemia may contribute up to 40% of the coronary mortality observed in previous antihypertensive trials. These findings suggest the need for an early detection and separate follow-up of these patients with silent CAD, to better assess the influence of antihypertensive treatment on coronary morbidity and mortality.
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