title: Use of baseline factors to predict complications and reinterventions after endovascular repair of abdominal aortic aneurysm.
abstract: BACKGROUND
  It is uncertain which baseline factors are associated with graft-related complications and reinterventions after endovascular aneurysm repair (EVAR) in patients with a large abdominal aortic aneurysm.
  
  
  METHODS
  Patients randomized to elective EVAR in EVAR Trial 1 or 2 were followed for serious graft-related complications (type 2 endoleaks excluded) and reinterventions. Cox regression analysis was used to investigate whether any prespecified baseline factors were associated with time to first serious complication or reintervention.
  
  
  RESULTS
  A total of 756 patients who had elective EVAR were followed for a mean of 3.7 years, by which time there were 179 serious graft complications (rate 6.5 per 100 person years) and 114 reinterventions (rate 3.8 per 100 person years). The highest rate was during the first 6 months, with an apparent increase again after 2 years. Multivariable analysis indicated that graft-related complications increased significantly with larger initial aneurysm diameter (P < 0.001) and older age (P = 0.040). There was also evidence that patients with larger common iliac diameters experienced higher complication rates (P = 0.011).
  
  
  CONCLUSIONS
  Graft-related complication and reintervention rates were common after EVAR in patients with a large aneurysm. Younger patients and those with aneurysms closer to the 5.5-cm threshold for intervention experienced lower rates.
authors.affiliation: Vascular Surgery Research Group, Imperial College, Charing Cross Hospital, London, UK. louise.brown@imperial.ac.uk
authors.forename: L C
authors.initials: LC
authors.lastname: Brown
authors.forename: R M
authors.initials: RM
authors.lastname: Greenhalgh
authors.forename: J T
authors.initials: JT
authors.lastname: Powell
authors.forename: S G
authors.initials: SG
authors.lastname: Thompson
mesh_terms: D000328:Adult; D000368:Aged; D017544:Aortic Aneurysm, Abdominal / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D001807:Blood Vessel Prosthesis; D019917:Blood Vessel Prosthesis Implantation; D017558:Elective Surgical Procedures; D004691:Endarterectomy / Q000379:methods / Q000401:mortality; D005260:Female; D006085:Graft Survival; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000209:etiology*; D012086:Reoperation