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 nosocomial infection.