title: Outcomes with retrievable inferior vena cava filters: a multicenter study.
abstract: OBJECTIVE
  To retrospectively review the outcomes after placement and retrieval of retrievable inferior vena cava (IVC) filters at two academic medical centers.
  
  
  METHODS
  All patients who underwent retrievable filter placement between May 2001 and December 2005 were included. Hospital records at both institutions were reviewed, and relevant data were collected concerning the placement and retrieval of all removable filters.
  
  
  RESULTS
  A total of 197 patients underwent placement of a retrievable IVC filter. Of those, 143 patients (72.5%) had Günther Tulip filters (GTFs) placed, and 54 patients (27.5%) had Recovery filters placed. A total of 94 patients underwent attempted filter retrieval, accounting for just less than half of all retrievable filters placed during the study period (47.7%). Retrievals were successful in 80 patients (85.1%). Half the retrieval failures (n = 7) were the result of thrombus within the filter, and technical difficulties (eg, filter embedded in IVC wall, tilted filter) were the cause of retrieval failure in the other half. There was no significant difference in retrieval failure rates between the GTF and Recovery filter (16.4% vs 9.5%, respectively). GTFs were removed after a median implantation time of 11 days (range, 1-139 d), whereas Recovery filters were removed after a median implantation time of 28 days (range, 6-117 d).
  
  
  CONCLUSIONS
  Placement and retrieval of nonpermanent IVC filters can be performed safely with a high technical success rate. In patients at high risk for venous thromboembolism and contraindication to anticoagulation, retrievable filters may be used aggressively to prevent the potentially devastating outcome of pulmonary embolism.
authors.affiliation: Department of Interventional Radiology, University of Colorado Health Sciences Center, 777 Bannock Street, Denver, CO 80204, USA. cray@hha.org
authors.forename: Charles E
authors.initials: CE
authors.lastname: Ray
authors.forename: Erica
authors.initials: E
authors.lastname: Mitchell
authors.forename: Stan
authors.initials: S
authors.lastname: Zipser
authors.forename: Edward Y
authors.initials: EY
authors.lastname: Kao
authors.forename: Charles F
authors.initials: CF
authors.lastname: Brown
authors.forename: Greg L
authors.initials: GL
authors.lastname: Moneta
mesh_terms: D006801:Humans; D008499:Medical Records; D019919:Prosthesis Implantation / Q000379:methods*; D012189:Retrospective Studies; D013927:Thrombosis / Q000000981:diagnostic imaging / Q000517:prevention & control*; D014057:Tomography, X-Ray Computed; D016306:Vena Cava Filters; D014682:Vena Cava, Inferior