Removable IVC filters are most likely to be used in which scenario?

• A. Cases of trauma and postoperative procedures
• B. Stable chronic atrial fibrillation
• C. Mild edema without thrombosis
• D. Elective angiography in asymptomatic patients

Answer: (A)

Temporary protection against pulmonary embolism is the key idea. Removable (retrievable) IVC filters are used when there is a short-term, high risk of embolism and anticoagulation cannot be given or must be avoided—for example during trauma or in the immediate postoperative period when bleeding risk is high. Once the patient stabilizes and anticoagulation can be restarted or the risk fades, the filter can be removed to reduce long-term complications.

In contrast, stable chronic atrial fibrillation typically requires long-term anticoagulation rather than a filter, unless anticoagulation is absolutely contraindicated. Mild edema without thrombosis does not create a substantial PE risk requiring an IVC filter, and elective angiography in asymptomatic patients likewise does not justify PE protection with a filter.