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Antiatherogenic properties of calcium antagonists
M G Bond1, C Purvis, M Mercuri
1Department of Neurobiology and Anatomy, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, NC 27103.
Insights
Calcium antagonists may directly reduce atherosclerosis progression by affecting arterial wall processes. Noninvasive B-mode ultrasonography can monitor these effects on carotid artery disease during early stages.
Area of Science:
- Cardiovascular Medicine
- Pharmacology
Background:
- Atherosclerosis is a complex disease involving arterial wall changes, cholesterol accumulation, and plaque rupture.
- Calcium antagonists have shown potential in reducing atherosclerosis in animal models, independent of blood pressure effects.
Purpose of the Study:
- To investigate the direct effects of calcium antagonists on arterial wall processes in atherosclerosis.
- To evaluate the efficacy of calcium antagonists in inhibiting new lesion development in human subjects.
- To explore the use of B-mode ultrasonography for monitoring atherosclerosis and treatment effects.
Main Methods:
- Review of studies on calcium antagonists in hypercholesterolemic animal models.
- Analysis of human subject trials assessing antiatherosclerosis properties of calcium antagonists.
- Application of B-mode ultrasonography for noninvasive detection and monitoring of carotid atherosclerosis.
Main Results:
- Calcium channel blockers appear to have a direct impact on arterial wall processes, suggesting antiatherosclerosis properties.
- Human studies indicate that calcium antagonists can inhibit the development of new atherosclerotic lesions.
- B-mode ultrasonography enables noninvasive monitoring of atherosclerosis progression and treatment efficacy.
Conclusions:
- Calcium antagonists demonstrate direct antiatherosclerosis effects on the arterial wall.
- B-mode ultrasonography combined with calcium antagonist treatment allows for evaluation of interventions during asymptomatic atherosclerosis.
- This approach aids in assessing treatment efficacy on arterial wall changes in carotid artery disease.
Abstract:
Atherosclerosis results from multiple factors, and involves several mechanisms including endothelial monocyte and smooth muscle cell changes, cholesterol accumulation, lumen stenosis, necrosis, mineralization, plaque hemorrhage, rupture, and thromboembolism. Calcium antagonists have been shown in hypercholesterolemic animal models to reduce atherosclerosis. This effect cannot be explained on the basis of changes in blood pressure, therefore suggesting that calcium channel antagonists have a direct effect on arterial wall processes associated with plaque evolution. The antiatherosclerosis properties of calcium antagonists have been tested in human subjects and suggest that these compounds inhibit new lesion development. Recent developments in B-mode ultrasonography allow investigators to detect and monitor atherosclerosis noninvasively. This method is being used in several trials within the U.S. and Europe to evaluate treatment effects on carotid atherosclerosis. Carotid artery disease is associated with transient ischemic attacks, ischemic cerebral infarction, and with risk for coronary artery disease. B-mode ultrasonography is a powerful method for monitoring atherosclerosis progression. The combination of this technology with calcium antagonist treatment will allow evaluation of the efficacy of intervention on the arterial wall during the asymptomatic stages of atherosclerosis evolution.
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