Single center experience of inferior vena cava filter retrieval in trauma patients: contrast-enhanced CT-based retrieval within hospital stay.

PURPOSE To assess the safety and retrieval rate of a predischarge inferior vena cava (IVC) filter retrieval strategy based on contrast computed tomography (CT). METHODS IVC filter insertion for trauma patients from 2010 to 2018 were reviewed. An active filter retrieval strategy was established in March 2017. The strategy sought early evaluation of venous thromboembolism (VTE) status and filter retrieval before a patient's discharge. The possibility of early IVC filter retrieval was evaluated by a multidisciplinary team based on pre-filter retrieval VTE-CT findings. Overall VTE-CT findings, retrieval rate, indwelling time, and recurrence of venous thromboembolic events were compared before and after the filter retrieval strategy setup. RESULTS 177 IVC filters were inserted in trauma patients. All patients underwent pre-filter retrieval VTE-CT. VTE-CT findings were as follows: completely resolved VTE, n = 108 (61%); partially improved, n = 58 (33%); no change, n = 8 (5%); aggravated, n = 3 (2%). The overall retrieval rate was 84% with a mean indwelling time of 32 days. In subgroup analyses, 95 (53%) had filter retrieval with the before strategy (BS) setup and 82 (47%) with the after strategy (AS) setup. The retrieval rate was significantly higher in the AS group [81/82 (99%) vs. 68/95 (72%), (p < 0.001)]. No patients had recurrent VTE during the follow-up period. CONCLUSIONS The active strategy of VTE-CT-based filter retrieval during the hospital stay markedly improved the filter retrieval rate from 72% to 99% without evidence of recurrence of VTE. Hazards of low retrieval rate versus CT-related radiation exposure should be studied in the future.