Does Chronic Treatment with Oral Anticoagulants Ameliorate the Clinical Course of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infection in Coronavirus Disease 2019 (COVID-19)?
The risk of ischemic stroke in patients with nonvalvular atrial fibrillation (NVAF) increases from 1.5% at 50 to 59 years of age to 23.5% at 80 to 89 years of age, and this is reflected in the CHA2DS2-VASc score. The incidence of venous thromboembolism (VTE) also increases from 0.1% by 1% per year at 50 years of age. However, the incidence of NVAF was not higher in older patients hospitalized with coronavirus disease 2019 (COVID-19). Mortality rates in patients with COVID-19were associated with older age, as well as diabetes and hypertension, which are also risk factors for adverse outcomes in NVAF. Surprisingly, mortality of COVID-19 patients was not associated with a history of NVAF and VTE. The American Heart Association has established a registry “Get With The Guidelines (GWTG)” to collect data on COVID-19 patients hospitalized with NVAF, coronary artery disease, heart failure, stroke, and in-hospital cardiac arrest. Active viral or bacterial infections are being documented during hospitalization, including emerging infectious diseases such as COVID-19.
Patients with NVAF and VTE are preferentially treated with a fixed dose of direct oral anticoagulants (DOACs) or with vitamin K antagonists (VKA) adjusted according to the international normalized ratio (INR) to prevent ischemic stroke and recurrent VTE.
Therefore, given the preceding background, we propose that patients on long-term oral anticoagulant treatment may be protected from a more severe course of COVID-19 disease ([Fig. 1]). Differences between VKA and DOACs and between factor Xa inhibitors (apixaban, edoxaban, and rivaroxaban) and the thrombin inhibitor dabigatran may affect the relative severity of COVID-19, although this needs to be shown. The lack of age-dependent mortality in COVID-19 patients with NVAF or a history of VTE may be explained by treatment with VKA or DOAC before hospitalization and may open new perspectives on disease prevention and treatment.
Effects of anticoagulants need to be determined rapidly and accurately to ascertain whether they should be administered further and to avoid hemorrhage in COVID-19 patients with NVAF and VTE. Rapid testing for anticoagulant status may also be useful to determine whether a switch from VKA or DOACs to heparin or low molecular weight heparin (LMWH) is needed upon admission to hospital. Specific and sensitive rapid point of care (POC) tests allow important medical decisions to be made immediately in these emergency situations ([Fig. 1]). POC INR tests can determine the intensity of VKA anticoagulation. The available methods for detecting DOACs may be limited by the presence of acute phase proteins and varying platelet counts in COVID-19 patients. The DOAC Dipstick (Doasense GmbH) is a rapid and accurate POC test that can be used on urine samples and is a viable option in emergency situations despite some limitations.
Following discharge, COVID-19 patients will need to switch back from LMWH or heparin treatment to VKA or DOAC treatment if there is a clear indication for long-term anticoagulation. The effects of the antithrombin-dependent anticoagulants LMWH and heparin and the oral anticoagulants DOAC and VKA should be determined regularly, and these anticoagulants should be administered according to the reported dosing regimens using specific coagulation or chromogenic test system.
In conclusion, we note that the number of NVAF and VTE patients with severe COVID-19 symptoms is very low; this may be explained by anticoagulant and nonanticoagulant effects of chronic treatment with DOAC or VKA, indicating a beneficial effect of prehospital oral anticoagulation and in-hospital heparinization ([Fig. 1]). However, specific analyses of available clinical studies are required to validate the interactions.
03 September 2020 (online)
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