the best doctors near me Risk factors associated with DVT: Deep vein thrombosis is further classified as proximal DVT and distal DVT. Proximal DVT mostly occurs in the popliteal vein and is found to be associated with active cancer, respiratory insufficiency and congestive cardiac failure. It is more prominent in patients with age above 75 years. On the other hand, distal DVT frequently occurs in the calf vein and is mostly associated with any recent surgery and immobilization. In comparison to distal DVT, proximal DVT is more responsible for fatal pulmonary embolism . In addition to this, some of the other factors associated with increased risk of venous thromboembolism (VTE) complications are persistent elevation of D-dimer, elevated levels of interleukin-8 in patients, oral contraceptive pills containing third-generation progestins etc. Genetic factors are also found to be associated with DVT. It includes deficiency of antithrombin, protein C, protein S