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Thrombogenesis in acute coronary syndromes
1Istituto di Cardiologia, Universita Cattolica, Rome, Italy.
Insights
Inflammation plays a key role in acute coronary syndromes by promoting intracoronary thrombosis and vasoconstriction. Inflammatory responses correlate with adverse prognosis in patients with unstable angina.
Area of Science:
- Cardiology
- Immunology
- Pathophysiology
Background:
- Intracoronary thrombosis and coronary vasoconstriction cause myocardial perfusion impairment, leading to unstable angina or acute myocardial infarction.
- Risk factors for acute coronary events include increased platelet reactivity, procoagulant activity, and reduced fibrinolysis.
- The primary causes of intracoronary thrombosis and coronary vasoconstriction in acute coronary syndromes remain largely speculative.
Purpose of the Study:
- To explore the role of inflammation in the pathogenesis of acute coronary syndromes.
- To investigate the correlation between inflammatory response intensity and prognosis in unstable angina patients.
Main Methods:
- Analysis of activated inflammatory cells in the coronary arterial wall and systemic circulation of unstable angina patients.
- Correlation analysis between the intensity of the inflammatory response and patient prognosis.
Main Results:
- Activated inflammatory cells are present in both the coronary artery wall and systemic circulation of patients with unstable angina.
- The intensity of the inflammatory response is directly correlated with an adverse prognosis in these patients.
Conclusions:
- Inflammation is a significant factor in acute coronary syndromes, potentially driving thrombosis and vasoconstriction.
- Inflammatory cytokines can enhance platelet sensitivity, promote procoagulant endothelial properties, and induce plaque fissure.
- The inflammatory component holds critical pathogenetic and prognostic importance in acute coronary syndromes.
Abstract:
It is well-established that intracoronary thrombosis, which may be associated with plaque fissure and enhanced coronary vasoconstriction, is the immediate cause of a sudden impairment of regional myocardial perfusion, which is transient in unstable angina and is, eventually, irreversible in acute myocardial infarction. It is also well-known that increased platelet reactivity, increased procoagulant activity, and reduced endogenous fibrinolysis are risk factors for acute coronary events. Nevertheless, the primary causes responsible for sudden intracoronary thrombosis and for coronary vasoconstriction causing acute coronary syndromes are still largely speculative. Recent studies have shown activated inflammatory cells both in the coronary arterial wall and in the systemic circulation of patients with unstable angina. Furthermore, the intensity of the inflammatory response is correlated with an adverse prognosis. This inflammatory component may have important pathogenetic and prognostic roles because an outburst of inflammatory cytokines has the potential to increase the sensitivity of platelets to agonists, to turn the anticoagulant and vasodilator physiological properties of the endothelium into procoagulant and vasoconstrictor properties, and to cause plaque fissure by the release of proteolytic enzymes.