Enoxaparin Use in Hospitalized SARS-CoV-2-Positive Patients with Elevated D-Dimer: A Pilot Study

Introduction: The SARS-CoV-2 is a human pathogenic coronavirus that causes a respiratory tract infection, which may lead to systemic hyper-inflammation that is associated with a hypercoagulable state. Anticoagulation as an adjunct may decrease thrombi formation. Objectives: This study aims to evaluate the efficacy and safety of enoxaparin for the prevention of thrombotic events in hospitalized SARS-CoV-2 patients with elevated D-dimer. Methods: A single-center retrospective cohort study was conducted to evaluate three enoxaparin dosing regimens: full treatment (1 mg/kg SC Q12H or 1.5 mg/kg SC Q24H), intermediate (.5 mg/kg SC Q12H or 1 mg/kg SC Q24H), and prophylaxis (40 mg SC Q24H). The primary endpoint evaluated the percentage of patients who developed a venous thromboembolism (VTE). The secondary endpoints evaluated the development of a major bleed, mechanical ventilation need, and death. Results: Forty-five patients were included with 27, 8, and 10 participants in the full treatment, intermediate, and prophylaxis arms, respectively. Six patients developed a VTE: 3, 1, and 2 in the listed above groups, respectively (P = .83). Twenty patients died: 11, 3, and 6, respectively (P = .64). Four patients developed a major bleed: 1, 1, and 2, respectively (P = .17). Six patients required intubation: 1, 2, and 3 in the arms, respectively (P = .043). Conclusion: The study did not find a difference in respect to the development of a VTE between the three investigated doses of anticoagulation. However, our findings suggest that treatment dose of enoxaparin might be associated with lower risk for mechanical ventilation in hospitalized COVID-19-positive patients with elevated D-dimer.