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Vessel Wall-Related Risk Factors in Acute Vascular Events

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Summary

Angiography in patients with unstable angina or myocardial infarction with subtotal coronary occlusion often reveals eccentric stenoses with irregular borders, suggesting ruptured atherosclerotic plaques and thrombosis, as documented by angioscopy and at autopsy. We have studied these processes in an ex vivo perfusion chamber, an in vivo swine model, and in human subjects. Our results, and those of other investigators, suggest that specific local risk factors at the time of plaque disruption influence the degree of thrombogenicity and, therefore, the various clinical syndromes. These risk factors can be divided into 2 groups: local vessel wall-related factors, and local (focal action) systemic factors. These risk factors include the following: 1) Rheological factors. It has been demonstrated that the more severe the stenotic lesion after plaque rupture, the higher the local shear rate with enhanced platelet deposition and thrombus formation; platelet deposition and thrombosis are particularly likely if the rupture includes the apex of the stenotic plaque, because of the high shear rate induced. 2) Degree of plaque damage. Plaque rupture produces a rough surface and stimulates an occlusive thrombus, which is enhanced depending on the degree of damage or amount of collagen type I and macrophage-dependent tissue factor exposed. 3) Residual thrombus. After spontaneous or pharmacological reperfusion, the surface of the residual thrombus is very thrombogenic and may contribute to reocclusion; this is partially due to thrombin bound to fibrin in the original thrombus. 4) Systemic factors. There is clinical and experimental evidence to suggest that 3 systemic factors at the time of plaque rupture may enhance thrombogenicity. Firstly, the levels of epinephrine (adrenaline) [i.e. in stress, smoking, early acute myocardial infarction], secondly, the level of serum cholesterol, and thirdly, impaired fibrinolysis resulting from high serum lipoprotein(a).

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Badimon, L., Badimon, J.J., Cohen, M. et al. Vessel Wall-Related Risk Factors in Acute Vascular Events. Drugs 42 (Suppl 5), 1–9 (1991). https://doi.org/10.2165/00003495-199100425-00003

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