tetano
Editor, Senior Moderator
Thromb Res
. 2020 Sep 21;196:359-366.
doi: 10.1016/j.thromres.2020.09.026. Online ahead of print.
Therapeutic versus prophylactic anticoagulation for severe COVID-19: A randomized phase II clinical trial (HESACOVID)
Anna Cristina Bertoldi Lemos[SUP] 1 [/SUP], Douglas Alexandre do Esp?rito Santo[SUP] 1 [/SUP], Ma?sa Cabetti Salvetti[SUP] 2 [/SUP], Renato Noffs Gilio[SUP] 2 [/SUP], Lucas Barbosa Agra[SUP] 1 [/SUP], Antonio Pazin-Filho[SUP] 1 [/SUP], Carlos Henrique Miranda[SUP] 3 [/SUP]
Affiliations
Abstract
Introduction: Coronavirus disease 2019 (COVID-19) causes a hypercoagulable state. Several autopsy studies have found microthrombi in pulmonary circulation.
Methods: In this randomized, open-label, phase II study, we randomized COVID-19 patients requiring mechanical ventilation to receive either therapeutic enoxaparin or the standard anticoagulant thromboprophylaxis. We evaluated the gas exchange over time through the ratio of partial pressure of arterial oxygen (PaO2) to the fraction of inspired oxygen (FiO2) at baseline, 7, and 14 days after randomization, the time until successful liberation from mechanical ventilation, and the ventilator-free days.
Results: Ten patients were assigned to the therapeutic enoxaparin and ten patients to prophylactic anticoagulation. There was a statistically significant increase in the PaO2/FiO2 ratio over time in the therapeutic group (163 [95% confidence interval - CI 133-193] at baseline, 209 [95% CI 171-247] after 7 days, and 261 [95% CI 230-293] after 14 days), p = 0.0004. In contrast, we did not observe this improvement over time in the prophylactic group (184 [95% CI 146-222] at baseline, 168 [95% CI 142-195] after 7 days, and 195 [95% CI 128-262] after 14 days), p = 0.487. Patients of the therapeutic group had a higher ratio of successful liberation from mechanical ventilation (hazard ratio: 4.0 [95% CI 1.035-15.053]), p = 0.031 and more ventilator-free days (15 days [interquartile range IQR 6-16] versus 0 days [IQR 0-11]), p = 0.028 when compared to the prophylactic group.
Conclusion: Therapeutic enoxaparin improves gas exchange and decreases the need for mechanical ventilation in severe COVID-19.
Trial registration: REBEC RBR-949z6v.
Keywords: Anticoagulant treatment; COVID-19; Coagulopathy; D-dimer; Mechanical ventilation.
. 2020 Sep 21;196:359-366.
doi: 10.1016/j.thromres.2020.09.026. Online ahead of print.
Therapeutic versus prophylactic anticoagulation for severe COVID-19: A randomized phase II clinical trial (HESACOVID)
Anna Cristina Bertoldi Lemos[SUP] 1 [/SUP], Douglas Alexandre do Esp?rito Santo[SUP] 1 [/SUP], Ma?sa Cabetti Salvetti[SUP] 2 [/SUP], Renato Noffs Gilio[SUP] 2 [/SUP], Lucas Barbosa Agra[SUP] 1 [/SUP], Antonio Pazin-Filho[SUP] 1 [/SUP], Carlos Henrique Miranda[SUP] 3 [/SUP]
Affiliations
- PMID: 32977137
- DOI: 10.1016/j.thromres.2020.09.026
Abstract
Introduction: Coronavirus disease 2019 (COVID-19) causes a hypercoagulable state. Several autopsy studies have found microthrombi in pulmonary circulation.
Methods: In this randomized, open-label, phase II study, we randomized COVID-19 patients requiring mechanical ventilation to receive either therapeutic enoxaparin or the standard anticoagulant thromboprophylaxis. We evaluated the gas exchange over time through the ratio of partial pressure of arterial oxygen (PaO2) to the fraction of inspired oxygen (FiO2) at baseline, 7, and 14 days after randomization, the time until successful liberation from mechanical ventilation, and the ventilator-free days.
Results: Ten patients were assigned to the therapeutic enoxaparin and ten patients to prophylactic anticoagulation. There was a statistically significant increase in the PaO2/FiO2 ratio over time in the therapeutic group (163 [95% confidence interval - CI 133-193] at baseline, 209 [95% CI 171-247] after 7 days, and 261 [95% CI 230-293] after 14 days), p = 0.0004. In contrast, we did not observe this improvement over time in the prophylactic group (184 [95% CI 146-222] at baseline, 168 [95% CI 142-195] after 7 days, and 195 [95% CI 128-262] after 14 days), p = 0.487. Patients of the therapeutic group had a higher ratio of successful liberation from mechanical ventilation (hazard ratio: 4.0 [95% CI 1.035-15.053]), p = 0.031 and more ventilator-free days (15 days [interquartile range IQR 6-16] versus 0 days [IQR 0-11]), p = 0.028 when compared to the prophylactic group.
Conclusion: Therapeutic enoxaparin improves gas exchange and decreases the need for mechanical ventilation in severe COVID-19.
Trial registration: REBEC RBR-949z6v.
Keywords: Anticoagulant treatment; COVID-19; Coagulopathy; D-dimer; Mechanical ventilation.