Antiplatelet therapy and outcome in COVID-19. Results from a multicentre international prospective registry (HOPE-COVID)

ABSTRACT

Aims: Standard therapy for Corona-virus-19 disease (COVID-19) is mainly developed for critical ill patients. Autopsy studies showed high prevalence of platelet-fibrin rich micro-thrombi in several organs. Aim of the study was to evaluate safety and efficacy of antiplatelet therapy (APT) in COVID-19 hospitalized patients and its impact on survival. Methods and results: 7824 consecutive patients with COVID-19 were enrolled in a multicentre-international prospective registry (HOPE-COVID-19). Clinical data and inhospital complications were recorded. Antiplatelet (AP) regimen, including aspirin and other antiplatelet drugs, was obtained for each patient. During hospitalization 730 (9%) patients received AP drugs with single (93%, n=680) or dual APT (7%, n=50). Patients treated with APT were older (74±12 vs. 63±17 years, P<0.01), more frequently male (68% vs. 57%, P<0.01) and had higher prevalence of diabetes (39% vs. 16%, P<0.01). Patients treated with APT compared with no APT showed no differences in terms of in-hospital mortality (18% vs. 19%, P=0.64, Log Rank P=0.23), need of invasive ventilation (8.7% vs. 8.5%, P=0.88), embolic events (2.9% vs. 2.5% P=0.34) and bleeding (2.1% vs. 2.4%, P=0.43) but shorter duration of mechanical ventilation (8±5 vs. 11±7 days, P=0.01);however, when comparing patients with APT vs. no APT and no anticoagulation therapy, APT was associated with lower mortality rates (Log Rank P<0.01, relative risk 0.79, 95% CI 0.70-0.94). At multivariable analysis in-hospital APT was associated with a lower mortality risk (relative risk 0.39, 95% CI 0.32-0.48, P<0.01). Conclusions: APT during hospitalization for COVID-19 could be associated with lower mortality risk and shorter duration of mechanical ventilation, without increased risk of bleeding.