Circulation. 2007;115:2435-2441
Published online before print April 16, 2007, doi: 10.1161/CIRCULATIONAHA.107.693739
Published online before print April 16, 2007, doi: 10.1161/CIRCULATIONAHA.107.693739
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(Circulation. 2007;115:2435-2441.)
© 2007 American Heart Association, Inc.
Interventional Cardiology |
Pathological Correlates of Late Drug-Eluting Stent Thrombosis
Strut Coverage as a Marker of Endothelialization
From CVPath, International Registry of Pathology, Gaithersburg, Md (M.J., G.N., F.K., R.V.); Cardiac Unit, Department of Internal Medicine, Massachusetts General Hospital, Boston (A.V.F., M.C.J., H.K.G.); and Partners Healthcare Systems, Boston, Mass (J.N.).
Correspondence to Renu Virmani, MD, Medical Director, CVPath, International Registry of Pathology, 19 Firstfield Rd, Gaithersburg, MD 20878. E-mail rvirmani{at}cvpath.org
Received October 4, 2006; accepted February 22, 2007.
Background— Late stent thrombosis (LST) after Cypher and Taxus drug-eluting stent placement has emerged as a major concern. Although the clinical predictors of LST have been reported, specific morphological and histological correlates of LST remain unknown.
Methods and Results— From a registry totaling 81 human autopsies of drug-eluting stents, 46 (62 lesions) had a drug-eluting stent implanted >30 days. We identified 28 lesions with thrombus and compared those with 34 of similar duration without thrombosis using computer-guided morphometric and histological analyses. LST was defined as an acute thrombus within a coronary artery stent in place >30 days. Multiple logistic generalized estimating equations modeling demonstrated that endothelialization was the best predictor of thrombosis. The morphometric parameter that best correlated with endothelialization was the ratio of uncovered to total stent struts per section. A univariable logistic generalized estimating equations model of occurrence of thrombus in a stent section versus ratio of uncovered to total stent struts per section demonstrated a marked increase in risk for LST as the number of uncovered struts increased. The odds ratio for thrombus in a stent with a ratio of uncovered to total stent struts per section >30% is 9.0 (95% CI, 3.5 to 22).
Conclusions— The most powerful histological predictor of stent thrombosis was endothelial coverage. The best morphometric predictor of LST was the ratio of uncovered to total stent struts. Heterogeneity of healing is a common finding in drug-eluting stents with evidence of LST and demonstrates the importance of incomplete healing of the stented segment in the pathophysiology of LST.
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