title: Application of computed tomography for surveillance of aortic grafts.
abstract: BACKGROUND
  This study was undertaken to assess the application of computed tomography (CT) for surveillance of aortic grafts.
  
  
  METHODS
  Demographics, operative technique, and graft type and size at the time of implantation of aortic grafts in 178 patients were recorded. CT measurements of graft diameters were made with calipers. Data were analyzed by analysis of variance, multiple regression, and chi-squared methods.
  
  
  RESULTS
  One hundred twenty-eight (72%) bifurcated grafts and 50 (28%) tube grafts were placed for aneurysmal disease (49%), aortoiliac occlusive disease (47%), ruptured aneurysm (2.3%), anastomotic aneurysm (1%), and graft aneurysm (0.6%). Mean implant time was 43.3 +/- 3.2 months. A total of 143 Dacron prostheses (74 woven, 69 knitted) and 35 polytetrafluoroethylene prostheses were placed. Mean percentage dilation was 49.2 +/- 4.0 for knitted prostheses, 28.5 +/- 3.0 for woven prostheses, and 20.6 +/- 1.9 for polytetrafluoroethylene prostheses compared with the graft implant size. A significant correlation was seen between graft dilation (more than 50%) and graft construction with knitted prostheses (p < 0.01, Tukey's range test). Complications detected by CT occurred in 24 (13.5%) patients including supragraft aneurysms (seven), distal anastomotic aneurysms (five), proximal anastomotic aneurysms (three), graft infections (two), perigraft fluid collections (two), graft aneurysm with thrombus and distal embolization (two), and nonvascular complications (three).
  
  
  CONCLUSIONS
  CT is a useful modality for postoperative imaging of aortic prostheses. Routine surveillance may detect complications before they become clinically apparent.
authors.affiliation: Section of Vascular Surgery, University of Arizona Health Sciences Center, Tucson, USA.
authors.forename: S S
authors.initials: SS
authors.lastname: Berman
authors.forename: G C
authors.initials: GC
authors.lastname: Hunter
authors.forename: S H
authors.initials: SH
authors.lastname: Smyth
authors.forename: L S
authors.initials: LS
authors.lastname: Erdoes
authors.forename: K E
authors.initials: KE
authors.lastname: McIntyre
authors.forename: V M
authors.initials: VM
authors.lastname: Bernhard
mesh_terms: D000368:Aged; D000704:Analysis of Variance; D001012:Aorta, Abdominal / Q000000981:diagnostic imaging* / Q000601:surgery; D017544:Aortic Aneurysm, Abdominal / Q000601:surgery; D001019:Aortic Rupture / Q000601:surgery; D001157:Arterial Occlusive Diseases / Q000601:surgery; D001807:Blood Vessel Prosthesis; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D011183:Postoperative Complications / Q000601:surgery; D013997:Time Factors; D014057:Tomography, X-Ray Computed