COVID-19 and Venous Thromboembolism Pharmacologic Thromboprophylaxis
Background: Coagulopathy has emerged as a hallmark issue of the coronavirus 2019 (COVID-19). Medical facilities are faced with the challenge of developing institutional thromboprophylaxis protocols; however, due to the novelty of the disease, there is a dearth of high-quality, prospective evidence for decision making.
Observations: The US National Institutes of Health along with 4 leading societies in the fields of thrombosis and hemostasis have published guidance based on expert consensus that helps provide a framework for local policy development. While there is agreement in a few areas, there are notable and sometimes considerable differences in recommendations that facilities should discuss when developing local guidance.
Conclusions: This document aims to streamline and simplify the available guidance so health care providers can readily identify consensus and divergence of COVID-19 thromboprophylaxis recommendations. Additionally, the authors provide and briefly highlight the COVID-19 thromboprophylaxis protocol of the US Department of Veterans Affairs Tennessee Valley Healthcare System in Nashville and Murfreesboro to serve as an example of a guideline-directed approach for order-set development.
Conclusions
The COVID-19 pandemic has resulted in arguably the most challenging medical climate in the evidence-based medicine era. Until high-quality randomized controlled trials are published, the medical community is, in a sense, operating within a crucible of crisis having to navigate therapeutic policy with little certainty. This principle holds true for thromboprophylaxis in patients with COVID-19 despite the numerous advancements in this field over the past decade.
A review of societal guidance shows there is universal agreement with regards to supporting standard doses of pharmacologicalprophylaxis in acutely ill patients either when universally applied or guided by a RAM as well as the use of universal thromboprophylaxis in critically ill patients. All societies discourage the use of antiplatelet therapy for arterial thrombosis prevention and advocate for mechanical compression in patients with contraindications to pharmacologic anticoagulation. Beyond this, divergence between guidance statements begins to appear. For example, societies do not currently agree on the role and approach for extended pharmacologic prophylaxis postdischarge. The differences between societal guidance speaks to the degree of uncertainty among leading experts, which is considered to be the logical outworking of the current level of evidence. Regardless, these guidance documents should be considered the best resource currently available.
The medical community is fortunate to have robust societies that have published guidance on thromboprophylaxis in patients with COVID-19. The novelty of COVID-19 precludes these societal guidance publications from being based on high-quality evidence, but at the very least, they provide insight into how leading experts in the field of thrombosis and hemostasis are currently navigating the therapeutic landscape.
While this paper provides a summary of the current guidance, evidence is evolving at an unprecedented pace. Facilities and anticoagulation leads should be actively and frequently evaluating literature and guidance to ensure their practices and policies remain current.
Acknowledgments
This material is the result of work supported with resources and the use of facilities at the VA Tennessee Valley Healthcare System in Nashville/Murfreesboro.
