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- W2796606922 abstract "Background and aims Circulating endothelial microparticles (EMPs) are increased in arterial hypertension. The role of physicomechanical factors that may induce EMP release in vivo is still unknown. We studied the relationship of EMPs and physicomechanical factors in stable arterial hypertension and hypertensive emergencies, and investigated the pattern of EMP release after mechanical endothelial injury. Methods In a pilot study, 41 subjects (50% hypertensives) were recruited. EMPs were discriminated by flow-cytometry (CD31+/41-, CD62e+, CD144+). Besides blood pressure measurements, pulse-wave-analysis was performed. Flow-mediated dilation (FMD), nitroglycerin-mediated dilation (NMD), and wall-shear-stress (WSS) were measured ultrasonographically in the brachial artery; microvascular perfusion by laser-Doppler (Clinicaltrials.gov: NCT02795377). We studied patients with hypertensive emergencies before and 4 h after BP lowering by urapidil (n = 12) and studied the release of EMPs due to mechanical endothelial injury after coronary angiography (n = 10). Results Hypertensives exhibited increased EMPs (CD31+/41-, CD144+, CD62e+) as compared to normotensives and EMPs univariately correlated with systolic BP (SBP), augmentation index, and pulse wave velocity and inversely with FMD. CD31+/41--EMPs correlated with diameter and inversely with WSS and NMD. CD62e+ and CD144+-EMPs inversely correlated with microvascular function. During hypertensive emergency, only CD62e+ and CD144+-EMPs were further elevated and FMD was decreased compared to stable hypertensives. Blood pressure lowering decreased CD62e+ and CD144+-EMPs and increased FMD. CD31+/41—EMPs, diameter, and WSS remained unaffected. Similar to hypertensive emergency, catheter-related endothelial injury increased only CD144+ and CD62e+-EMPs. Conclusions EMP release in hypertension is complex and may involve both physicomechanical endothelial injury and activation (CD144+, CD62e+) and decreased wall shear stress (CD31+/41-)." @default.
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- W2796606922 date "2018-06-01" @default.
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- W2796606922 title "Release of endothelial microparticles in patients with arterial hypertension, hypertensive emergencies and catheter-related injury" @default.
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- W2796606922 doi "https://doi.org/10.1016/j.atherosclerosis.2018.04.012" @default.
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