title: Significance of initial aortic aneurysm pressure sensor readings varies with aortic endograft design.
abstract: BACKGROUND
  The differences in implantable pressure sensor aneurysm sac readings were compared following endovascular aneurysm repair (EVAR) among three different stent grafts.
  
  
  METHODS
  From January 2006 to March 2009, 51 aortic stent grafts were implanted along with the Endosure sensor. Grafts used were Zenith, Talent, and Excluder. In the present retrospective study, pulse ratios were measured intraoperatively before and after aneurysm sac exclusion and in follow-up (within 30 days). Analysis of variance was used to determine significance.
  
  
  RESULTS
  The average aneurysm size that was repaired was 5.75 cm (range: 4-8.5 cm); 41 patients (80.4%) being male with an average age of 76.3 years (range: 58-90 years). Thirty-four grafts were Zenith, 9 were Talent, and 8 were Excluder. The average pre-aneurysm exclusion pulse ratios for the Zenith, Talent, and Excluder were 1.00, 1.08, and 0.95 (p = 0.18), respectively. The average post-aneurysm exclusion pulse ratios were 0.34, 0.67, and 0.35, respectively (p = 0.003). Pulse ratios at the time of follow-up (within 30 days) were 0.17, 0.22, and 0.11, respectively (p = 0.44). Nine of 51 (17.6%) patients had a reduction of pulse ratio of less than 30% after endograft implantation. Five of those 9 patients (55.5%) had the Talent endograft, although there was no angiographic evidence of endoleak.
  
  
  CONCLUSIONS
  The Talent graft has significantly higher pulse ratios following endograft implantation despite having no angiographic evidence of endoleak when compared to the Zenith and Excluder grafts. However, the pulse ratios decreased to levels similar to Zenith and Excluder within 30 days of endograft implantation. This suggests that the Talent endograft may have increased porosity initially. If pulse ratios do not appropriately decrease immediately after device implantation, further angiographic imaging may not be necessary if no obvious endoleak is seen.
authors.affiliation: Department of Surgery, New York Presbyterian Hospital, Columbia University Medical Center, 630 West 168th Street, New York, NY 10032, USA. gs2459@columbia.edu
authors.forename: Gautam
authors.initials: G
authors.lastname: Shrikhande
authors.forename: Sikandar
authors.initials: S
authors.lastname: Khan
authors.forename: Hafiz
authors.initials: H
authors.lastname: Hussain
authors.forename: Alicia
authors.initials: A
authors.lastname: Menezes
authors.forename: James
authors.initials: J
authors.lastname: McKinsey
authors.forename: Harry
authors.initials: H
authors.lastname: Bush
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D017544:Aortic Aneurysm, Abdominal / Q000503:physiopathology* / Q000601:surgery*; D001807:Blood Vessel Prosthesis; D019917:Blood Vessel Prosthesis Implantation; D004567:Electrodes, Implanted; D005260:Female; D006801:Humans; D008297:Male; D008365:Manometry; D008875:Middle Aged; D011312:Pressure; D011474:Prosthesis Design; D012189:Retrospective Studies; D015607:Stents