Atherosclerosis, introduction and pathophysiology

Kazuyuki Yahagi, Harry R. Davis, Michael Joner, Renu Virmani

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

3 Scopus citations

Abstract

Patients with acute coronary syndrome classically present with unstable angina, acute myocardial infarction, or sudden coronary death. In approximately 50-60 - of sudden coronary death cases, the culprit lesion exhibits an acute coronary thrombus, whereas the remainder of thesecases have stable coronary plaques with greater than 75 % cross-sectional area luminal narrowing with or without chronic total occlusion or healed myocardialinfarction. There are threemain causes of coronary thrombosis: plaque rupture, erosion, and calcified nodule originally described from observations made at autopsy but nowconfirmed by optical coherence tomography. Themost common cause of coronary thrombus is plaque rupture, which ischaracterized bya large necrotic core anda disrupted thin fibrous cap rich in macrophages that allows blood to come in contact with the highly thrombogenic necrotic core inducing luminal thrombosis. A few decades ago, it was proposed that matrix metalloproteinases liberatedfrommacrophages were themain mechanism of fibrous cap disruption in coronary plaque rupture. On the other hand, in plaque erosion the platelet-rich thrombus is in direct contact with the intima, and the latter is rich in smooth muscle cells and proteoglycan-collagen matrix with an absence of endothelial lining. The underlying plaque in erosions consists of either pathological intimal thickening orthick fibrous cap fibroatheroma, and the frequency of these underlyinglesions is similar. Calcified nodule is theleast frequentcause of coronary thrombosis, which occursin highly calcified arteries. The highly calcified arteries are composed of calcified sheets which likely break into multiple small calcified nodules that are surrounded by fibrin with a luminal thrombus. The eruptive calcified nodules are usually eccentric, protruding into the lumen, andthere is an absence of endothelium and collagen above the nodules, and there is an associated platelet-rich luminal thrombus which is typically nonocclusive. This chapter focuses on plaque progression and includes the three responsible entities of thrombosis as we have learnt from studies carried out in sudden coronary death victims.

Original languageEnglish
Title of host publicationPathophysiology and Pharmacotherapy of Cardiovascular Disease
PublisherSpringer International Publishing
Pages527-546
Number of pages20
ISBN (Electronic)9783319159614
ISBN (Print)9783319159607
DOIs
StatePublished - 1 Jan 2015
Externally publishedYes

Keywords

  • Atherosclerosis
  • Calcified nodule
  • Cardiac biomarker
  • Plaque erosion
  • Plaque rupture
  • TCFA

Fingerprint

Dive into the research topics of 'Atherosclerosis, introduction and pathophysiology'. Together they form a unique fingerprint.

Cite this