<prompt> 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 anticoagulantsDiscontinuing anticoagulantsUse of an inferior vena cava IVC filterCT scan of the leg and abdomen  <response>: 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. 