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- W2000599555 abstract "Background Enhanced thrombolysis is a proposed mechanism for reduced mortality in cigarette smokers with STEMI (“smoker's paradox”). The mechanisms remain unclear but studies suggest fibrin architecture (FA) may affect thrombolysis. Our group has previously shown that acute cigarette smoke exposure (CSE) alters FA. This study was done to evaluate the association between FA, thrombolysis and CSE. Methods and Results Otherwise healthy smokers (n=22) were studied before and after smoking two cigarettes. Non-smokers (n=22) served as controls. Two ex-vivo models were used to evaluate clot lysis of venous blood and these data were compared to FA as determined by SEM. In the first model, clot lysis in a glass tube at 60 minutes after addition of t-PA was measured. The second model quantified lysis utilizing thromboelastography. With the latter, after a clot reached maximum strength, t-PA was added and clot lysis at 60 min was noted. SEM studies were performed on platelet poor plasma mixed with thrombin and FA was examined at 20 K. Clot lysis was similar in both groups except that post-smoking, TEG showed a significantly lower lysis compared to pre- and non-smoking clots. SEM analysis showed significantly thinner fibers and denser clots post-smoking. Conclusions Venous clots from smokers failed to show an enhanced lysis when exposed to t-PA. In fact, acute CSE was associated with changes in FA and increased resistance to thrombolysis. These findings in part may explain enhanced thrombogenicity but suggest that mechanisms other than enhanced fibrinolysis are likely to be responsible for “smoker's paradox.”" @default.
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- W2000599555 date "2010-11-01" @default.
- W2000599555 modified "2023-10-01" @default.
- W2000599555 title "Acute cigarette smoke exposure reduces clot lysis -- association between altered fibrin architecture and the response to t-PA" @default.
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- W2000599555 doi "https://doi.org/10.1016/j.thromres.2010.07.021" @default.
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