{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T18:33:35Z","timestamp":1780511615724,"version":"3.54.1"},"reference-count":49,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"6","content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["ATVB"],"published-print":{"date-parts":[[2025,6]]},"abstract":"<jats:sec>\n            <jats:title>BACKGROUND:<\/jats:title>\n            <jats:p>Patients with severe aortic stenosis, undergoing transcatheter aortic valve replacement (TAVR), are more likely to develop thrombotic complications. However, the definite mechanisms underlying the hypercoagulation state remain unclear to date. Our objectives were to explore whether and how neutrophil extracellular traps (NETs) play a procoagulant role in patients after TAVR alone or TAVR with percutaneous coronary intervention within 1 year and further to evaluate their interactions with platelets and endothelial cells.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>METHODS:<\/jats:title>\n            <jats:p>The levels of plasma NETs, platelets, and endothelial cell activation markers were analyzed by ELISA. NET formation was observed by immunofluorescence. Procoagulant activity was measured by clotting time, fibrin, and TAT (thrombin-antithrombin) complex generation assays. Phosphatidylserine exposure on cells was assessed by flow cytometry.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>RESULTS:<\/jats:title>\n            <jats:p>Compared with pre-TAVR, controls, or severe aortic stenosis without TAVR patients, the plasma NET levels in patients after TAVR alone, especially TAVR with percutaneous coronary intervention, increased from 7 days, peaking at 3 months, and then gradually decreased until the 12th month. Furthermore, neutrophils and plasma from patients post-TAVR are more prone to promote NET formation; NETs from these patients markedly decreased clotting time and increased fibrin and TAT generation. Additionally, a high concentration of NETs induced platelet aggregation and exerted a strong cytotoxic effect on endothelial cells and transformed them into a procoagulant phenotype.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>CONCLUSIONS:<\/jats:title>\n            <jats:p>These results lead us to believe that NETs contribute to the hypercoagulability in patients post-TAVR. Our study may provide a new target for preventing thrombotic complications in patients post-TAVR by blocking NET generation.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1161\/atvbaha.124.322376","type":"journal-article","created":{"date-parts":[[2025,4,3]],"date-time":"2025-04-03T10:47:54Z","timestamp":1743677274000},"page":"1006-1019","update-policy":"https:\/\/doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":1,"title":["Procoagulant Effect of Neutrophil Extracellular Traps, Activated Platelets, and Endothelial Cells in Patients After TAVR"],"prefix":"10.1161","volume":"45","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-2285-1516","authenticated-orcid":true,"given":"Wei","family":"Wu","sequence":"first","affiliation":[{"name":"Department of Cardiology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, China 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