From the Journals

New oral anticoagulants drive ACC consensus on bleeding


 

FROM THE JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY

Patients on oral anticoagulants who experience a bleeding event may be able to discontinue therapy if certain circumstances apply, according to updated guidance from the American College of Cardiology.

The emergence of direct-acting oral anticoagulants (DOACs) to prevent venous thromboembolism and the introduction of new reversal strategies for factor Xa inhibitors prompted the creation of an Expert Consensus Decision Pathway to update the version from 2017, according to the ACC. Expert consensus decision pathways (ECDPs) are a component of the solution sets issued by the ACC to “address key questions facing care teams and attempt to provide practical guidance to be applied at the point of care.”

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In an ECDP published in the Journal of the American College of Cardiology, the writing committee members developed treatment algorithms for managing bleeding in patients on DOACs and vitamin K antagonists (VKAs).

Bleeding was classified as major or nonmajor, with major defined as “bleeding that is associated with hemodynamic compromise, occurs in an anatomically critical site, requires transfusion of at least 2 units of packed red blood cells [RBCs]), or results in a hemoglobin drop greater than 2 g/dL. All other types of bleeding were classified as nonmajor.

The document includes a graphic algorithm for assessing bleed severity and managing major versus nonmajor bleeding, and a separate graphic describes considerations for reversal and use of hemostatic agents according to whether the patient is taking a VKA (warfarin and other coumarins), a direct thrombin inhibitor (dabigatran), the factor Xa inhibitors apixaban and rivaroxaban, or the factor Xa inhibitors betrixaban and edoxaban.

Another algorithm outlines whether to discontinue, delay, or restart anticoagulation. Considerations for restarting anticoagulation include whether the patient is pregnant, awaiting an invasive procedure, not able to receive medication by mouth, has a high risk of rebleeding, or is being bridged back to a vitamin K antagonist with high thrombotic risk.

In most cases of GI bleeding, for example, current data support restarting oral anticoagulants once hemostasis is achieved, but patients who experience intracranial hemorrhage should delay restarting any anticoagulation for at least 4 weeks if they are without high thrombotic risk, according to the document.

The report also recommends clinician-patient discussion before resuming anticoagulation, ideally with time allowed for patients to develop questions. Discussions should include the signs of bleeding, assessment of risk for a thromboembolic event, and the benefits of anticoagulation.

“The proliferation of oral anticoagulants (warfarin and DOACs) and growing indications for their use prompted the need for guidance on the management of these drugs,” said Gordon F. Tomaselli, MD, chair of the writing committee, in an interview. “This document provides guidance on management at the time of a bleeding complication. This includes acute management, starting and stopping drugs, and use of reversal agents,” he said. “This of course will be a dynamic document as the list of these drugs and their antidotes expand,” he noted.

“The biggest change from the previous guidelines are twofold: an update on laboratory assessment to monitor drug levels and use of reversal agents,” while the acute management strategies have otherwise remained similar to previous documents, said Dr. Tomaselli.

Dr. Tomaselli said that he was not surprised by the biological aspects of recent research while developing the statement. However, “the extent of the use of multiple anticoagulants and antiplatelet agents was a bit surprising and complicates therapy with each of the agents,” he noted.

The way the pathways are presented may make them challenging to follow in clinical practice, said Dr. Tomaselli. “The pathways are described linearly and in practice often many things have to happen at once,” he said. “The other main issue may be limitations in the availability of some of the newer reversal agents,” he added.

“The complication of bleeding is difficult to avoid,” said Dr. Tomaselli, and for future research, “the focus needs to continue to refine the indications for anticoagulation and appropriate use with other drugs that predispose to bleeding. We also need better methods and testing to monitor drugs levels and the effect on coagulation,” he said.

In accordance with the ACC Solution Set Oversight Committee, the writing committee members, including Dr. Tomaselli, had no relevant relationships with industry to disclose.

SOURCE: Tomaselli GF et al. J Am Coll Cardiol. 2020. doi: 10.1016/j.jacc.2020.04.053.

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