title: Prophylactic inferior vena cava filters: do they make a difference in trauma patients?
abstract: BACKGROUND
  Inferior vena cava filters (IVCF) are used in trauma patients to reduce the incidence of pulmonary embolism (PE). This study investigates the efficacy of prophylactic IVCF (PIVCF) placement from implantation through outpatient follow-up.
  
  
  METHODS
  Data were prospectively collected on PIVCF placed in trauma patients > or =18-years old from 2004 to 2006. Exclusion criteria include therapeutic IVCF, major burns, deviated from a modified EAST protocol, and deaths. Data were collected on age, gender, Injury Severity Score (ISS), filter type, total implant days, PE, deep venous thrombosis (DVT), and filter-related complications.
  
  
  METHODS
  p < 0.05*, chi square test, mean +/- SD.
  
  
  RESULTS
  Of 4,936 patients, 280 had an IVCF with 244 meeting inclusion criteria. Study group demographics: 63.5% men; 98.8% blunt; mean age 43.8 +/- 20.3; ISS 26.7 +/- 12.8. There were 176 of 244 (72.1%) patients who met traditional EAST guidelines for PIVCF. PIVCF increased significantly from 29 in 2004 to 127 in 2006 with no difference in the PE rate (0.7% to 0.4%). There were 4 PEs (1.6%) on postprocedure days 7, 14, 18, and 23. Five technical complications occurred: two filter fractures, two caudal migrations, and one filter tilt. A total of 140 retrievable filters had the opportunity for outpatient follow-up for 18 months with 58.6% removed, 15.7% declared permanent, 12.1% lost to follow-up, and 13.6% still considered potential removal candidates. Days to implant: 0 to 32; 3.89 +/- 4.79. Implant days: 15 to 838; mean 231 +/- 162.
  
  
  CONCLUSIONS
  PIVCF increased significantly without impacting the overall PE rate. There was a 1.6% PE rate among PIVCF, high retrieval rate (59%), low complication rate (0.1%), and satisfactory compliance with traditional EAST guidelines.
authors.affiliation: Section of Trauma and Critical Care, Department of Surgery, Penn State Milton S. Hershey Medical Center, 500 University Drive, Hershey, PA 17033, USA. rcherry@psu.edu
authors.forename: Robert A
authors.initials: RA
authors.lastname: Cherry
authors.forename: Pamela A
authors.initials: PA
authors.lastname: Nichols
authors.forename: Theresa M
authors.initials: TM
authors.lastname: Snavely
authors.forename: Mauger T
authors.initials: MT
authors.lastname: David
authors.forename: Frank C
authors.initials: FC
authors.lastname: Lynch
mesh_terms: D000328:Adult; D020878:Device Removal; D019544:Equipment Failure Analysis; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D015601:Injury Severity Score; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011655:Pulmonary Embolism / Q000453:epidemiology* / Q000517:prevention & control*; D013997:Time Factors; D016896:Treatment Outcome; D016306:Vena Cava Filters; D014947:Wounds and Injuries / Q000150:complications* / Q000628:therapy