A turbulent coagulation system is a prominent feature of Coronavirus Disease 2019 (COVID-19), with venous thromboembolism (VTE) a leading cause of death. Our hypothesis is that patients with inherited hypocoagulability, like congenital bleeding disorders (CBD), enjoy a protective effect against COVID-19-induced hypercoagulability and related fatal consequences. Our primary and follow-up observations revealed this effect, at least among patients with moderate to severe congenital bleeding disorders, particularly coagulation factor deficiencies. Theoretically, patients with inherited hypocoagulobility have only a potential protective effect against COVID-19-related hypercoagulability. Yet the lower rate of morbidity and mortality in patients with CBDs suggests that hypercoagulability and thrombotic events are the main cause of death in COVID-19. Therefore, appropriate and timely administration of anticoagulants could significantly decrease the rate of morbidity and mortality in COVID-19.
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