Final answer:
The next best step in management for a 62-year-old male with DVT in the common femoral vein is to begin anticoagulation therapy with Low molecular weight heparin (LMWH). Warfarin may be used for longer-term treatment, while compression stockings and IVC filters are adjunctive or alternative measures, respectively.
Step-by-step explanation:
A 62-year-old male with a history of metastatic non-small cell carcinoma of the lung who completed palliative chemotherapy presents with symptoms of deep vein thrombosis (DVT). Considering the clinical situation and the presentation of a thrombosis in the common femoral vein, the next best step in management is to initiate anticoagulation therapy. The treatment of choice in this scenario is Low molecular weight heparin (LMWH), as it can be administered quickly and has a rapid onset of action, which is crucial in the management of DVT to prevent further complications, such as pulmonary embolism (PE).
Warfarin is another anticoagulant that might be considered for long-term management but typically LMWH is preferred initially. Compression stockings may be recommended as part of conservative management to help reduce symptoms and prevent further clots, but they are not sufficient as a stand-alone treatment for acute DVT. Lastly, placement of an Inferior vena cava (IVC) filter may be considered in cases where anticoagulation is contraindicated or has failed, but it is not the next best step in this situation.