title: Günther Tulip Retrievable Vena Cava Filter: results from the Registry of the Canadian Interventional Radiology Association.
abstract: OBJECTIVE
  To report data collected by the Canadian Registry of the Günther Tulip Retrievable Filter (GTF).
  
  
  METHODS
  Between February 1998 and December 2000, 90 patients at eight hospitals underwent implantation of 91 GTFs. There were 45 male patients and 45 female patients, age 17-88 years, with a mean age of 49 years. Indications for filter placement were pulmonary embolism (PE) or deep vein thrombosis (DVT) with a contraindication to anticoagulation in 83 patients, prophylaxis after massive PE in one, prophylaxis for proximal free-floating thrombus in one, and prophylaxis with no DVT or PE in six patients (major trauma, n = 4; high preoperative risk, n = 2). GTF retrieval was attempted in selected patients from a right internal jugular vein approach.
  
  
  RESULTS
  One GTF was inadvertently placed in the right iliac vein and could not be retrieved. There were no other major placement complications. GTF retrieval was attempted in 52 patients (53 GTFs); 52 GTFs were successfully retrieved from 51 patients. Implantation times were 2-25 days (mean, 9 d). Of these 51 patients, 37 underwent follow-up for 5-420 days (mean, 103 d) after filter retrieval. Four patients (8% of retrieved GTFs) required reinsertion of a permanent filter 17-167 days (mean, 78 d) after GTF retrieval as a result of bleeding from anticoagulation (n = 2) or because the patient required further surgery (n = 2). One other patient had recurrent DVT 230 days after retrieval; no PE or other complication was documented in the retrieval group. GTFs were not retrieved from 39 patients for various reasons. Of these 39 patients, 25 underwent follow-up 7-420 days (mean, 85 d) after filter placement. Two patients developed filter occlusion (5%); no other complications were documented.
  
  
  CONCLUSIONS
  The GTF has a broad range of utility: it can be used as a permanent filter or retrieved after implantation periods of 15 days and possibly longer. However, indications for retrieval require further study, as does the maximum implantation time.
authors.affiliation: Department of Radiology, London Health Sciences Centre, University of Western Ontario, London, Canada. sfmillward@home.com
authors.forename: S F
authors.initials: SF
authors.lastname: Millward
authors.forename: V L
authors.initials: VL
authors.lastname: Oliva
authors.forename: S D
authors.initials: SD
authors.lastname: Bell
authors.forename: D A
authors.initials: DA
authors.lastname: Valenti
authors.forename: P
authors.initials: P
authors.lastname: Rasuli
authors.forename: M
authors.initials: M
authors.lastname: Asch
authors.forename: A
authors.initials: A
authors.lastname: Hadziomerovic
authors.forename: J R
authors.initials: JR
authors.lastname: Kachura
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002170:Canada; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011655:Pulmonary Embolism / Q000628:therapy*; D015641:Radiography, Interventional; D012042:Registries; D012189:Retrospective Studies; D012449:Safety; D012955:Societies, Medical; D016306:Vena Cava Filters / Q000009:adverse effects / Q000706:statistics & numerical data*; D014682:Vena Cava, Inferior / Q000000981:diagnostic imaging*; D020246:Venous Thrombosis / Q000628:therapy*