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55254 Surgery

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?

AIncreasing the dose of anticoagulants
BDiscontinuing anticoagulants
CUse of an inferior vena cava (IVC) filter
DCT scan of the leg and abdomen
Surgery
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