title: Aortic dilatation after endovascular repair of blunt traumatic thoracic aortic injuries.
abstract: OBJECTIVE
  Endovascular repair of blunt traumatic thoracic aortic injuries (BTAI) has become routine at many trauma centers despite concerns regarding durability and aortic dilatation in these predominantly young patients. These concerns prompted this examination of thoracic aortic expansion after endovascular repair of a BTAI.
  
  
  METHODS
  The immediate postoperative and most recent computed tomography (CT) scans of patients who had undergone urgent endovascular repair of a BTAI and had at least 1 year of follow-up were reviewed. Diameter measurements were made at four predetermined sites: immediately proximal to the left subclavian artery (D1), immediately distal to the left subclavian artery (D2), distal extent of the endograft (D3), and 15 mm beyond the distal end of the endograft (D4). Split screens permitted direct comparison of measurements between CTs at the corresponding levels.
  
  
  RESULTS
  During a 6-year period (2001-2007), 21 patients (mean age, 42.9 years; range, 19-81 years) underwent endovascular repair of a BTAI, 17 with at least 1 year of follow-up (mean, 2.6 years; range, 1-5.5 years). No patients required reintervention during this period. The mean rate of dilatation for each level of the thoracic aorta in mm/year was: D1, 0.74 (95% confidence interval [CI], 0.42-1.06); D2, 0.83 (95% CI, 0.55-1.11); D3, 0.63 (95% CI, 0.37-0.89); D4, 0.47 (95% CI, 0.27-0.67). The rate of expansion of D2 differed significantly vs D4 (P = .025).
  
  
  CONCLUSIONS
  During the first several years of follow-up, the proximal thoracic aorta dilates minimally after endovascular repair of BTAIs, with the segment just distal to the left subclavian artery expanding at a slightly greater rate. Longer-term follow-up is necessary to determine whether this expansion continues and becomes clinically significant.
authors.affiliation: Division of Vascular Surgery, London Health Sciences Centre & The University of Western Ontario, London, Ontario, Canada. Tom.Forbes@lhsc.on.ca
authors.forename: Thomas L
authors.initials: TL
authors.lastname: Forbes
authors.forename: Jeremy R
authors.initials: JR
authors.lastname: Harris
authors.forename: D Kirk
authors.initials: DK
authors.lastname: Lawlor
authors.forename: Guy
authors.initials: G
authors.lastname: Derose
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001013:Aorta, Thoracic / Q000000981:diagnostic imaging / Q000293:injuries / Q000601:surgery*; D017545:Aortic Aneurysm, Thoracic / Q000000981:diagnostic imaging / Q000209:etiology*; D001027:Aortography / Q000379:methods; D019917:Blood Vessel Prosthesis Implantation / Q000009:adverse effects*; D004108:Dilatation, Pathologic; D006801:Humans; D008875:Middle Aged; D009864:Ontario; D013898:Thoracic Injuries / Q000000981:diagnostic imaging / Q000601:surgery*; D013997:Time Factors; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014949:Wounds, Nonpenetrating / Q000000981:diagnostic imaging / Q000601:surgery*; D055815:Young Adult