In the CSE-DVT group, the number of cases with a duration of invasive ventilation support time >72 hours, and the number of cases with infection (including primary infection and hospital acquired infection) and intravenous nutritional support was greater than that in the group of patients with nonconvulsive DVT; the PLT and AT-III levels were higher than those in the nonconvulsive DVT group, while the APTT was lower than that in the nonconvulsive DVT group. Here, SERPINC1 is linked to deep vein thrombosis.