Anticoagulation in Patients With COVID-19: JACC Review Topic of the Week

Michael E Farkouh, Gregg W Stone, Anuradha Lala, Emilia Bagiella, Pedro R Moreno, Girish N Nadkarni, Ori Ben-Yehuda, Juan F Granada, Ovidiu Dressler, Elizabeth O Tinuoye, Carlos Granada, Jessica Bustamante, Carlos Peyra, Lucas C Godoy, Igor F Palacios, Valentin Fuster, Michael E Farkouh, Gregg W Stone, Anuradha Lala, Emilia Bagiella, Pedro R Moreno, Girish N Nadkarni, Ori Ben-Yehuda, Juan F Granada, Ovidiu Dressler, Elizabeth O Tinuoye, Carlos Granada, Jessica Bustamante, Carlos Peyra, Lucas C Godoy, Igor F Palacios, Valentin Fuster

Abstract

Clinical, laboratory, and autopsy findings support an association between coronavirus disease-2019 (COVID-19) and thromboembolic disease. Acute COVID-19 infection is characterized by mononuclear cell reactivity and pan-endothelialitis, contributing to a high incidence of thrombosis in large and small blood vessels, both arterial and venous. Observational studies and randomized trials have investigated whether full-dose anticoagulation may improve outcomes compared with prophylactic dose heparin. Although no benefit for therapeutic heparin has been found in patients who are critically ill hospitalized with COVID-19, some studies support a possible role for therapeutic anticoagulation in patients not yet requiring intensive care unit support. We summarize the pathology, rationale, and current evidence for use of anticoagulation in patients with COVID-19 and describe the main design elements of the ongoing FREEDOM COVID-19 Anticoagulation trial, in which 3,600 hospitalized patients with COVID-19 not requiring intensive care unit level of care are being randomized to prophylactic-dose enoxaparin vs therapeutic-dose enoxaparin vs therapeutic-dose apixaban. (FREEDOM COVID-19 Anticoagulation Strategy [FREEDOM COVID]; NCT04512079).

Keywords: COVID-19; anticoagulation; clinical trial; coagulopathy.

Conflict of interest statement

Funding Support and Author Disclosures Dr Farkouh has received research grants from Amgen, Novo Nordisk, and Novartis. Dr Stone has received speaker honoraria from Infraredx; has served as a consultant to Valfix, TherOx, Robocath, HeartFlow, Ablative Solutions, Miracor, Neovasc, Abiomed, Ancora, Vectorious, Elucid Bio, Occlutech, CorFlow, Apollo Therapeutics, Impulse Dynamics, Cardiomech, Gore, and Amgen; and has equity/options from Ancora, Cagent, Applied Therapeutics, Biostar family of funds, SpectraWave, Orchestra Biomed, Aria, Cardiac Success, Valfix, and Xenter. Dr Godoy is supported by the Frederick Banting and Charles Best Canada Graduate Scholarship (Doctoral Research Award) from the Canadian Institutes of Health Research. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose.

Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.

Figures

Graphical abstract
Graphical abstract
Figure 1
Figure 1
Proposed Stages of COVID-19, With Suggested Therapeutic Interventions Antithrombotic medications might be helpful in all stages of disease. Other possible therapeutic interventions are shown for each disease stage, as well as a hypothetical pathophysiology mechanism. ∗Approximate distribution of primary staging of disease among symptomatic patients. Adapted from Cordon-Cardo et al. ACE2 = angiotensin-converting enzyme 2.
Figure 2
Figure 2
Principal Results From the Multiplatform REMAP-CAP, ACTIV-4a, and ATTACC Trial (A) Clinical outcomes in the strata of noncritically ill hospitalized patients with COVID-19 not requiring intensive care unit (ICU)–level of care. (Left) Survival until hospital discharge without receiving organ support. (Right) Major bleeding tended to be increased with therapeutic-dose anticoagulation (posterior probability that therapeutic-dose anticoagulation is inferior to usual-care thromboprophylaxis, leading to more bleedings: 95.5%). (B) Clinical outcomes in the strata of critically ill hospitalized patients with COVID-19 requiring ICU-level respiratory or cardiovascular organ support. (Left) The secondary outcome of survival to hospital discharge (posterior probability of inferiority: 89.2%). (Right) Major bleeding tended to be increased with therapeutic-dose anticoagulation.
Central Illustration
Central Illustration
Main Design Elements of the FREEDOM COVID-19 Anticoagulation Trial The FREEDOM COVID-19 Anticoagulation trial (NCT04512079) is a prospective, multicenter, open-label, randomized controlled comparative safety and effectiveness study that will enroll up to 3,600 patients. Enoxaparin is administered subcutaneously and apixaban is administered orally. CrCl = creatinine clearance; ICU = intensive care unit; Q12h = every 12 hours.

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Source: PubMed

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