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[Atherothrombosis and inflammation]
1Medizinische Universitätsklinik Abteilung Innere Medizin III Otfried-Müller-Strasse 10 72076 Tübingen, Germany.
Insights
Atherosclerosis involves coagulation, inflammation, and platelet issues, leading to acute coronary syndromes. Understanding these complex interactions is key to managing cardiovascular disease progression.
Area of Science:
- Cardiovascular Medicine
- Hematology
- Immunology
Context:
- Atherosclerosis involves complex pathophysiological factors including coagulation, fibrinolysis, platelets, and inflammation.
- Acute progression of atherosclerotic lesions, particularly in acute coronary syndromes, involves thrombus formation and inflammatory reactions.
Purpose:
- To discuss the current knowledge on the activation of coagulation and inflammatory pathways in atherosclerosis.
- To explore the complex interactions between these pathways during acute atherosclerotic events.
Summary:
- Coagulation pathways (extrinsic and intrinsic) and fibrinolysis are altered, leading to a hypercoagulable state in atherosclerosis.
- Platelet activation, low-grade inflammation, and acute phase reactions are central to the pathophysiology of acute coronary syndromes.
- Ruptured plaques expose tissue factor, triggering local and systemic inflammation, endothelial dysfunction, and contributing to thrombus formation.
Impact:
- Provides insights into the mechanisms underlying acute coronary syndromes.
- Highlights the intricate interplay between thrombosis and inflammation in cardiovascular disease.
- Informs potential therapeutic strategies targeting coagulation and inflammatory pathways.
Abstract:
Alterations of coagulation, fibrinolysis, platelets and low grade inflammation are causal pathophysiological factors in atherosclerosis. Considerable activation of several involved pathways occurs during the acute progression of atherosclerotic lesions, which is characterized by an occluding thrombus, and local and systemic inflammatory reactions as in patients with acute coronary syndromes. These patients become clinically compromised due to the reduction in coronary flow. Furthermore, a frequent occurrence of non-occluding thrombi may be assumed as a progression factor in atherosclerotic diseases. Both the extrinsic and the intrinsic pathway of coagulation are involved, resulting in a hypercoagulative state. Furthermore, an inflammatory acute phase reaction occurs in addition to the activation of several other inflammatory pathways in patients with unstable angina pectoris or acute myocardial infarction. Exposure of tissue factor by the ruptured plaque together with a systemic hypercoagulative state, local and systemic inflammation as well as stimulated platelets and endothelial dysfunction are involved in the pathophysiology of acute coronary syndromes. In the following paper the current knowledge on activation of these pathways and on the various complex interactions is discussed.