This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: 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? 
Select and explain. 
A. Increasing the dose of anticoagulants, B. Discontinuing anticoagulants, C. Use of an inferior vena cava (IVC) filter, D. CT scan of the leg and abdomen
C: Use of an inferior vena cava (IVC) filter
Answer: C: Use of an inferior vena cava (IVC) filter 
Explanation: In general, failure (or inability) to continue anticoagulants is an indication to insert an IVC filter to minimize the possibility of serious and possibly fatal pulmonary embolus.