Do not agree with the terms of the study, Moderate or severe respiratory failure requiring admission to the Intensive Care Unit (ICU) with the need for invasive mechanical ventilation or non-invasive ventilation with positive pressure (NIV), Pregnancy or puerperium, People with hematological diseases, coagulation disorders, use of anticoagulants, previous heparin-induced allergy or thrombocytopenia, thrombocytopenia with a count of less than 50.000 platelets / mm3, No diagnostic confirmation of COVID-19 by RT-PCR within 72 hours of inclusion in the study.

Do not agree with the terms of the study, Moderate or severe respiratory failure requiring admission to the Intensive Care Unit (ICU) with the need for invasive mechanical ventilation or non-invasive ventilation with positive pressure (NIV), Pregnancy or puerperium, People with hematological diseases, coagulation disorders, use of anticoagulants, previous heparin-induced allergy or thrombocytopenia, thrombocytopenia with a count of less than 50.000 platelets / mm3, No diagnostic confirmation of COVID-19 by RT-PCR within 72 hours of inclusion in the study.