The Pathophysiology of Atherosclerosis

Description

Progression through atherogenesis unfolds along the arterial wall, beginning at the endothelium and the tunica intima where LDL-rich lipid infiltrates and becomes oxidized beneath an intact luminal surface. Monocytes adhere, migrate into the intima, and differentiate into macrophages that engorge into foam cells, building a fatty streak that expands eccentrically toward the lumen while smooth muscle cells move from the tunica media to form an evolving fibrous cap. Frame by frame, the plaque matures into an atheroma with a necrotic lipid core, inflammatory shoulder regions, and areas of calcification, then the cap fissures or ruptures to expose thrombogenic material and trigger platelet aggregation and fibrin-rich thrombus. Clinically, the sequence explains why stable angina correlates with fixed luminal stenosis, while acute coronary syndrome often follows cap rupture and superimposed thrombosis rather than gradual narrowing alone. The animation makes the temporal relationship between endothelial dysfunction, inflammatory cell recruitment, cap remodeling, and abrupt occlusion easy to teach, and it clarifies how a noncritical plaque can become the culprit lesion when inflammation thins the fibrous cap. Sudden ischemia is the point. Cardiology and pathology instructors can slot this into ASCVD lectures to connect lipid biology to myocardial infarction and ischemic stroke mechanisms, and medical publishers can pair it with chapters on plaque morphology, thrombosis, and secondary prevention. It also fits clinical education on antiplatelet therapy, statins, and the rationale for targeting LDL and inflammation in high-risk patients. Anatomical accuracy verified by SciePro's Medical Advisory Board.