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• W2901350069 abstract "Complete mechanistic understanding of impaired microvascular reflow after myocardial infarction will likely lead to new therapies for reducing infarct size. Myocardial contrast echocardiography perfusion imaging and molecular imaging were used to evaluate the contribution of microvascular endothelial-associated VWF (von Willebrand factor) and platelet adhesion to microvascular no-reflow.Myocardial infarction was produced by transient LAD ligation in WT (wild type) mice, WT mice treated with the VWF proteolytic enzyme ADAMTS13 (a disintegrin and metalloproteinase with thrombospondin type 1 motif, member 13), and ADAMTS13-deficient (ADAMTS13-/-) mice. Myocardial contrast echocardiography perfusion imaging and molecular imaging of VWF and platelet GP (glycoprotein) Ibα were performed 30 minutes after ischemia-reperfusion. Infarct size was measured at 3 days. Mortality during ischemia-reperfusion incrementally increased in WT+ADAMTS13, WT, and ADAMTS13-/- mice (14%, 43%, and 63%, respectively; P<0.05). For WT mice, molecular imaging signal for platelets and VWF in the postischemic risk area was 4- to 5-fold higher ( P<0.05) compared with both the remote nonischemic regions or to sham-treated mice. Signal enhancement in the risk area was completely abolished by ADAMTS13 treatment for both platelets (12.8±3.3 versus -1.0±4.4 IU; P<0.05) and VWF (13.9±4.0 versus -1.0±3.0 IU; P<0.05). ADAMTS13-/- compared with WT mice had 2- to 3-fold higher risk area signal for platelets (33.1±8.5 IU) and VWF (30.9±1.9 IU). Microvascular reflow in the risk area incrementally decreased for WT+ADAMTS13, WT, and ADAMTS13-/- mice ( P<0.05), whereas infarct size incrementally increased ( P<0.05).Mechanistic information on microvascular no-reflow is possible by combining perfusion and molecular imaging. In reperfused myocardial infarction, excess endothelial-associated VWF and secondary platelet adhesion in the risk area microcirculation contribute to impaired reflow and are modifiable." @default.
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• W2901350069 date "2018-11-01" @default.
• W2901350069 modified "2023-10-06" @default.
• W2901350069 title "Molecular Imaging of VWF (von Willebrand Factor) and Platelet Adhesion in Postischemic Impaired Microvascular Reflow" @default.
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• W2901350069 doi "https://doi.org/10.1161/circimaging.118.007913" @default.
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