[Pathological-anatomic basis of unstable angina pectoris]
1JH Holland Laboratories, American Red Cross, Rockville MD.
Insights
The exact causes of coronary artery disease remain unclear, but plaque rupture, often due to tissue fatigue, leads to unstable angina and heart attacks.
Area of Science:
- Cardiovascular Medicine
- Pathology
- Biomedical Engineering
Context:
- Coronary artery disease (CAD) is a leading cause of mortality worldwide.
- Unstable angina pectoris and myocardial infarction are acute clinical manifestations of CAD.
- Atherosclerotic plaques are the underlying pathology in CAD.
Purpose:
- To elucidate the primary trigger mechanisms of coronary artery disease.
- To understand the pathological and anatomical changes associated with plaque rupture.
- To explore the potential role of tissue fatigue in plaque instability.
Summary:
- While primary triggers for coronary artery disease (CAD) are not fully understood, unstable angina is consistently linked to acute plaque changes.
- Plaque rupture, often at the weakest fibrous cap area, exposes lipids and necrotic core, leading to thrombosis, hemorrhage, and dissection.
- Tissue fatigue is hypothesized as a potential mechanism driving plaque rupture, resulting in acute coronary syndromes.
Impact:
- Improved understanding of CAD pathogenesis.
- Potential for novel therapeutic targets to prevent plaque rupture.
- Enhanced diagnostic strategies for identifying vulnerable plaques.
Abstract:
The primary trigger mechanisms leading to coronary artery disease are largely unknown; however, consensus has been reached that unstable angina pectoris is always associated with acute pathological and anatomical changes in a plaque, most commonly in the form of a plaque fissure or rupture involving the fibrous luminal cap with thrombosis, hemorrhage and dissection. Rupture almost always occurs at the weakest part of the fibrous cap and leads to exposition of extracellular lipids and matrix, necrotic tissue and lipid-laden foam cells. The exact mechanisms of plaque rupture are not entirely known; it is possible, however, that they do represent fatigue breaks in the tissue. The clinical consequences of these events are unstable angina pectoris and myocardial infarction.
Related Concept Videos
01:26Coronary Artery Disease II: Pathophysiology
01:30Acute Coronary Syndrome I: Introduction
01:19Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations
01:30Angina I: Introduction
01:27Angina II: Classification
01:29Angina III: Clinical Manifestations and Assessment