Abstract：
:The occurrence of cerebral or retinal ischemic symptoms ipsilateral to high-grade internal carotid artery (ICA) stenosis indicates a status of instability with a substantial risk for future major stroke. Additionally, the detection of microembolic signals downstream of ICA stenosis is predictive for future cerebral ischemia in asymptomatic and symptomatic patients. There is substantial evidence that in unstable ICA stenosis plaque rupture and thrombus formation are the most frequent pathoanatomic findings. In contrast, in nearly the half of unstable carotid plaques the lumen surface appears to be intact. Within plaque tissue, the unstable plaque is mainly characterized by a substantial amount of inflammatory cell (i. e. macrophages, T-cells) infiltration. These cells are mainly localized in the fibrous cap near the necrotic core. Produced by macrophages, matrix degrading enzymes (e. g. MMP-9) are overexpressed in the unstable ICA stenosis. Thrombogenicity is mainly determined by the local concentration of activated tissue factor, also expressed by inflammatory cells. Furthermore, a significantly higher rate of apoptotic smooth muscle cells can be found within the fibrous cap of instable carotid stenoses. Whether infection with Chlamydia pneumoniae contribute to instability is unlikely, because a positive association to clinical instability has not been shown up to now. The exact and detailed characterization of the unstable ICA plaque and the correlation of different biological mechanisms to clinical instability may offer the possibility to use it as a human model of unstable atherosclerosis in general and to test the efficacy of new developed anti-atherosclerotic pharmaceutical agents.
journal_name
Hamostaseologiejournal_title
Hamostaseologieauthors
Sitzer M,Trostdorf Fkeywords:
subject
Has Abstractpub_date
2003-05-01 00:00:00pages
61-6issue
2eissn
0720-9355issn
2567-5761pii
03020061journal_volume
23pub_type
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