What is already known about this subject
We searched PubMed for articles published from the start of the pandemic up to October 30th, 2020, using the keywords “coronavirus”, “COVID-19”, “SARS-CoV-2”, “therapeutic anticoagulation”, and “thrombosis” or “embolism”. The existing evidence shows that patients with COVID-19 have a hypercoagulable state with increased risk of thrombotic events. Three studies investigated the association between therapeutic anticoagulation prior to hospitalization and mortality with ambivalent results, probably due to methodological limitations.