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Platelet Function Changes during Neonatal Cardiopulmonary Bypass Surgery: Mechanistic Basis and Lack of Correlation with Excessive Bleeding.

  • Zwifelhofer, Nicole M J1
  • Bercovitz, Rachel S2
  • Cole, Regina3, 4
  • Yan, Ke3, 4
  • Simpson, Pippa M3, 4
  • Moroi, Alyssa1
  • Newman, Peter J1, 5
  • Niebler, Robert A3, 4
  • Scott, John P3, 4, 6
  • Stuth, Eckehard A D3, 6
  • Woods, Ronald K3, 7
  • Benson, D Woodrow4
  • Newman, Debra K1, 8
  • 1 Versiti-Blood Research Institute, Milwaukee, Wisconsin, United States. , (United States)
  • 2 Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States. , (United States)
  • 3 Herma Heart Institute, Children's Hospital of Wisconsin, Milwaukee, Wisconsin, United States. , (United States)
  • 4 Department of Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin, United States. , (United States)
  • 5 Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, United States. , (United States)
  • 6 Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States. , (United States)
  • 7 Department of Surgery, Medical College of Wisconsin, Milwaukee, Wisconsin, United States. , (United States)
  • 8 Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States. , (United States)
Published Article
Thrombosis and Haemostasis
Georg Thieme Verlag KG
Publication Date
Nov 21, 2019
DOI: 10.1055/s-0039-1700517
PMID: 31752040


Thrombocytopenia and platelet dysfunction induced by extracorporeal blood circulation are thought to contribute to postsurgical bleeding complications in neonates undergoing cardiac surgery with cardiopulmonary bypass (CPB). In this study, we examined how changes in platelet function relate to changes in platelet count and to excessive bleeding in neonatal CPB surgery. Platelet counts and platelet P-selectin exposure in response to agonist stimulation were measured at four times before, during, and after CPB surgery in neonates with normal versus excessive levels of postsurgical bleeding. Relative to baseline, platelet counts were reduced in patients while on CPB, as was platelet activation by the thromboxane A2 analog U46619, thrombin receptor activating peptide (TRAP), and collagen-related peptide (CRP). Platelet activation by adenosine diphosphate (ADP) was instead reduced after platelet transfusion. We provide evidence that thrombocytopenia is a likely contributor to CPB-associated defects in platelet responsiveness to U46619 and TRAP, CPB-induced collagen receptor downregulation likely contributes to defective platelet responsiveness to CRP, and platelet transfusion may contribute to defective platelet responses to ADP. Platelet transfusion restored to baseline levels platelet counts and responsiveness to all agonists except ADP but did not prevent excessive bleeding in all patients. We conclude that platelet count and function defects are characteristic of neonatal CPB surgery and that platelet transfusion corrects these defects. However, since CPB-associated coagulopathy is multifactorial, platelet transfusion alone is insufficient to treat bleeding events in all patients. Therefore, platelet transfusion must be combined with treatment of other factors that contribute to the coagulopathy to prevent excessive bleeding. Georg Thieme Verlag KG Stuttgart · New York.

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