What Is Coronary Arteriosclerosis?

Coronary arteriosclerosis is a chronic progressive disease of the coronary arteries in which the vessel walls thicken, stiffen, and narrow as a result of plaque accumulation and structural changes to arterial tissue. The most clinically significant form is atherosclerosis, in which deposits of lipids, inflammatory cells, calcium, and fibrous material build up within the intimal layer of the artery wall, progressively restricting blood flow to the heart muscle. Left untreated, coronary arteriosclerosis is a leading cause of myocardial infarction, angina pectoris, and sudden cardiac death.

The disease process begins decades before symptoms appear. Endothelial injury, triggered by factors such as elevated low-density lipoprotein, hypertension, smoking, and diabetes, allows lipoproteins to penetrate the arterial wall. Macrophages engulf oxidized lipid particles and transform into foam cells, forming the fatty streaks visible in early-stage disease. Over time these lesions expand into fibrous plaques, and rupture of a vulnerable plaque triggers acute thrombosis and coronary occlusion.

Pathophysiology and Plaque Formation

The formation of an atherosclerotic plaque is fundamentally an inflammatory process. Cytokines and adhesion molecules recruit monocytes to the arterial wall, where they differentiate into macrophages. The lipid core of a plaque is surrounded by a fibrous cap composed of smooth muscle cells and collagen; the stability of this cap determines whether a lesion is stable, producing gradual ischemia, or vulnerable, prone to sudden rupture. Vulnerable plaques with thin fibrous caps and large necrotic cores carry the greatest risk of acute coronary events even when they cause only modest luminal narrowing on angiography.

Calcification is a secondary feature that develops as the disease progresses. Coronary artery calcium scoring, measured by CT, has become a standard risk stratification tool because calcium burden correlates closely with overall plaque burden, even though calcified plaques are generally more stable than soft lipid-rich lesions.

Diagnostic Imaging

Non-invasive imaging has transformed the ability to detect and characterize coronary arteriosclerosis before clinical symptoms emerge. Coronary CT angiography (CCTA) provides detailed cross-sectional images of the coronary lumen and vessel wall, allowing quantification of both obstructive and non-obstructive disease. Cardiac MRI offers complementary information on myocardial perfusion and viability without ionizing radiation.

Invasive modalities provide higher resolution detail of individual lesions. Intravascular ultrasound (IVUS) and optical coherence tomography (OCT) image the vessel wall from within the artery, revealing plaque composition and fibrous cap thickness. A review published in PMC on artificial intelligence in cardiovascular atherosclerosis imaging describes how machine learning algorithms applied to IVUS and OCT datasets can automate plaque characterization and assess vulnerability with accuracy rates approaching expert readers.

Research on emerging MRI techniques for atherosclerosis imaging published in Arteriosclerosis, Thrombosis, and Vascular Biology documents advances in high-resolution vessel wall imaging that can detect lipid-rich necrotic cores and intraplaque hemorrhage non-invasively, opening pathways toward earlier intervention.

Treatment and Intervention

Medical management centers on reducing modifiable risk factors and stabilizing existing plaques. Statin therapy reduces LDL cholesterol and has anti-inflammatory properties that directly affect plaque composition, increasing fibrous cap thickness and reducing the lipid core. Antiplatelet agents reduce the risk of acute thrombosis should a plaque rupture. For obstructive disease, percutaneous coronary intervention (PCI) with stent placement or coronary artery bypass grafting (CABG) restores blood flow to ischemic myocardium.

A comprehensive overview in Frontiers in Cardiovascular Medicine on methods for diagnosing atherosclerosis surveys both established and emerging approaches, covering biomarkers, functional stress testing, and the integration of multi-modality data for risk stratification.

Applications

Coronary arteriosclerosis research has applications in a range of fields, including:

• Medical imaging and computational image analysis for plaque detection
• Wearable biosensors for continuous cardiovascular risk monitoring
• Computational fluid dynamics modeling of coronary blood flow
• Drug delivery systems targeting arterial inflammation
• Machine learning for automated cardiac risk scoring