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• W3187717678 abstract "Background Persistent symptoms including breathlessness, fatigue, and decreased exercise tolerance have been reported in patients after acute SARS-CoV-2 infection. The biological mechanisms underlying this “long COVID” syndrome remain unknown. However, autopsy studies have highlighted the key roles played by pulmonary endotheliopathy and microvascular immunothrombosis in acute COVID-19. Objectives To assess whether endothelial cell activation may be sustained in convalescent COVID-19 patients and contribute to long COVID pathogenesis. Patients and Methods Fifty patients were reviewed at a median of 68 days following SARS-CoV-2 infection. In addition to clinical workup, acute phase markers, endothelial cell (EC) activation and NETosis parameters and thrombin generation were assessed. Results Thrombin generation assays revealed significantly shorter lag times (p < .0001, 95% CI −2.57 to −1.02 min), increased endogenous thrombin potential (p = .04, 95% CI 15–416 nM/min), and peak thrombin (p < .0001, 95% CI 39–93 nM) in convalescent COVID-19 patients. These prothrombotic changes were independent of ongoing acute phase response or active NETosis. Importantly, EC biomarkers including von Willebrand factor antigen (VWF:Ag), VWF propeptide (VWFpp), and factor VIII were significantly elevated in convalescent COVID-19 compared with controls (p = .004, 95% CI 0.09–0.57 IU/ml; p = .009, 95% CI 0.06–0.5 IU/ml; p = .04, 95% CI 0.03–0.44 IU/ml, respectively). In addition, plasma soluble thrombomodulin levels were significantly elevated in convalescent COVID-19 (p = .02, 95% CI 0.01–2.7 ng/ml). Sustained endotheliopathy was more frequent in older, comorbid patients, and those requiring hospitalization. Finally, both plasma VWF:Ag and VWFpp levels correlated inversely with 6-min walk tests. Conclusions Collectively, our findings demonstrate that sustained endotheliopathy is common in convalescent COVID-19 and raise the intriguing possibility that this may contribute to long COVID pathogenesis." @default.
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• W3187717678 date "2021-10-01" @default.
• W3187717678 modified "2023-10-16" @default.
• W3187717678 title "Persistent endotheliopathy in the pathogenesis of long COVID syndrome" @default.
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• W3187717678 doi "https://doi.org/10.1111/jth.15490" @default.
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