ABSTRACT
Our objective in this study is to know the predictors of thromboembolic events 1 year after hospitalization for severe COVID-19 and the benefit of preventive oral anticoagulation for 1 month to placebo after release. We conducted a prospective study to determine the benefit of preventive anticoagulation upon discharge from the hospital and to determine the predictive factors of thromboembolic events. We included 720 patients in the SARCOV-19 Registry, with a mean age of 62.07 (±18.11), and 61.1% male. After 1 year, 60 thromboembolic events were observed, 45 in patients on a placebo, and 15 in patients on a direct oral anticoagulant. The predictive factors determined for these events were the presence of cardiac disease, elevation of D-dimer during hospitalization, myocardial damage defined by elevation of troponins more than 6 times normal, and the use of mechanical ventilation. However, the use of preventive anticoagulation protects against thrombotic events and reduces the risk of a thromboembolic event at 1 year with a relative risk of 0.49 compared to a placebo. The prolongation of the preventive anticoagulation at the exit will protect with a decrease of almost 50% of the risk against thrombotic events and this without increasing the risk of bleeding.