Variables evaluated
Data collected included patient demographics, risk factors for DVT development, characteristics of the thrombus, anticoagulation used, and interventional therapies utilized. Risk factors for DVT included inherited and acquired thrombophilias (prothrombin G20210A and Factor V Leiden mutations, decreased protein C, S, and antithrombin, elevated lipoprotein [a], homocysteine, and antiphospholipid antibodies), hospital-related (presence or history of central venous catheters, recent immobilization, surgery, or trauma), disease-related (infection, cancer, inflammatory bowel disease, or nephrotic syndrome), or medication-related (estrogen, steroids, or asparaginase). Characteristics of the thrombus included laterality, veins involved, extent of thrombus, and presence of pulmonary embolus (PE). Interventional therapies included use of CDT, Angiojet for thrombectomy and pharmacomechanical thrombectomy, Indigo system for mechanical thrombectomy, stent placement, intravenous ultrasound [IVUS], and percutaneous transluminal angioplasty [PTA].