Schulman S, Arnold DM, Bradbury CA, Broxmeyer L, Connors JM, Falanga A, Iba T, Kaatz S, Levy JH, Middeldorp S, Minichiello T, Nazy I, Ramacciotti E, Resnick HE, Samama CM, Sholzberg M, Thachil J, Zarychanski R, and Spyropoulos AC
Based on emerging evidence from the COVID-19 pandemic, the International Society on Thrombosis and Haemostasis (ISTH) guidelines for antithrombotic treatment in COVID-19 were published in 2022. Since then, at least 16 new randomized controlled trials have contributed additional evidence, which necessitated a modification of most of the previous recommendations. We used again the American College of Cardiology Foundation/American Heart Association methodology for assessment of level of evidence (LOE) and class of recommendation (COR). Five recommendations had the LOE upgraded to A and 2 new recommendations on antithrombotic treatment for patients with COVID-19 were added. Furthermore, a section was added to answer questions about COVID-19 vaccination and vaccine-induced immune thrombotic thrombocytopenia (VITT), for which studies have provided some evidence. We only included recommendations with LOE A or B. Panelists agreed on 19 recommendations, 4 for nonhospitalized, 5 for noncritically ill hospitalized, 3 for critically ill hospitalized, and 2 for postdischarge patients, as well as 5 for vaccination and VITT. A strong recommendation (COR 1) was given for (a) use of prophylactic dose of low-molecular-weight heparin or unfractionated heparin in noncritically ill patients hospitalized for COVID-19, (b) for select patients in this group, use of therapeutic-dose low-molecular-weight heparin/unfractionated heparin in preference to prophylactic dose, and (c) for use of antiplatelet factor 4 enzyme immunoassays for diagnosing VITT. A strong recommendation was given against (COR 3) the addition of an antiplatelet agent in hospitalized, noncritically ill patients. These international guidelines provide recommendations for countries with diverse healthcare resources and COVID-19 vaccine availability., Competing Interests: Declaration of competing interests S.S. has received a research grant from Octapharma; served on data safety monitoring boards for Alexion, Bayer, Boehringer-Ingelheim, and Sanofi; served on event adjudication for Daiichi Sankyo; and served on an advisory board for Servier. D.M.A. received research grants from Rigel Pharmaceuticals and the Public Health Agency of Canada and is a consultant for Amgen, Paradigm, Sobi, Alpine, Novartis, and Argenx. C.A.B. has received a research grant from Amgen, honoraria from BMS-Pfizer, Janssen, and Sanofi, and served on the advisory board for Novartis. L.B. currently owns a stock portfolio with Johnson & Johnson and Pfizer. J.M.C. has received a research grant from CSL Behring and has served on scientific advisory boards for Abbott, Anthos, Bristol Myers Squibb, Pfizer, and Werfen. A.F. has received honoraria from Kedrion and Rovi and served on an advisory board for Sanofi. S.K. has received research grants from Bayer and is a consultant for Inari and Janssen. J.H.L. has served on a data safety monitoring board with Merck, a research study steering committee with Octapharma, and the advisory board for Werfen. S.M. has received research grants from Bayer, Abbvie, Hemab, Viatris, and Sanofi and honoraria from AstraZeneca, Norgine, and Alveron. I.N. has received research grants from Paradigm Pharmaceuticals, Janssen/Johnson & Johnson, UCB Biopharma, AstraZeneca, and the Public Health Agency of Canada and is a consultant for Paradigm Pharmaceuticals, Janssen/Johnson & Johnson, UCB Biopharma, and AstraZeneca. E.R. has received research grants from Bayer, Pfizer, and Novartis and honoraria from Sanofi, Bayer, Ache, Daiichi Sankyo, and Pfizer. C.M.S. served on an advisory board for Norgine Pharma. M.S. has received research grants from Pfizer, Amgen, and Sanofi; received honoraria from Pfizer, Octapharma, Amgen, and Novartis; and served on advisory boards for Amgen and Novartis. A.C.S. has received a research grant from AstraZeneca and honoraria from Janssen, Regeneron, and AstraZeneca. J.T. received honoraria from Bristol Myers Squibb, Pfizer, and Daiichi Sankyo. R.Z. has received research grants from the Canadian Institute of Health Research, LifeArc, Nation Institute of Health, Research Manitoba, CancerCare Manitoba Foundation, Peter Munk Cardiac Centre, Thistledown Foundation, and Manitoba Medical Services Foundation. The remaining authors have no conflicts of interest to declare. S.S. has been primary author and coauthor on review articles on COVID-19. D.M.A. has been coauthor and senior author on articles on diagnosis and treatment of VITT. C.A.B. has been primary author and co-author on articles on heparins and antiplatelet agents for treatment of COVID-19. J.M.C. has been primary author and coauthor on articles on antiplatelet agents, apixaban, and heparin for treatment of COVID-19. A.F. has been coauthor on review articles on treatment of COVID-19, including with heparin. T.I. has been primary author and coauthor on articles on coagulopathy in COVID-19 and in VITT. S.K. has been coauthor on articles on heparin and antiplatelet agents for treatment of COVID-19. J.H.L. has been primary author and coauthor on articles on coagulopathy in COVID-19 and in VITT and on heparin for treatment of COVID-19. S.M. has been coauthor on articles on heparin and oral anticoagulants for the treatment of COVID-19. I.N. has been primary author, senior author, and coauthor on articles on coagulopathy and laboratory diagnosis in VITT and COVID-19. C.M.S. has been coauthor on articles on coagulopathy in COVID-19. M.S. has been primary author on articles on heparin for treatment of COVID-19. A.C.S. has been primary author and senior author on articles on heparin and coauthor on articles on rivaroxaban for treatment of COVID-19. J.T. has been primary author and coauthor on articles on coagulopathy in COVID-19. R.Z. has been primary author and coauthor on articles on heparin and antiplatelet agents, respectively, for treatment of COVID-19. The remaining authors have no intellectual conflicts of interest., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)