Following resection of the left colon, a 67-year-old obese woman develops left-sided leg edema due to deep-vein thrombosis. She is placed on anticoagulants, but after 2 weeks of warfarin (Coumadin), she develops a pulmonary embolus with slight hypoxemia. What should the next step in management involve?
Increasing the dose of anticoagulants Discontinuing anticoagulants Use of an inferior vena cava (IVC) filter CT scan of the leg and abdomen