title: Dilation of gelatin-sealed knitted dacron prosthesis.
abstract: OBJECTIVE
  Postoperative dilation of gelatin-sealed knitted dacron prostheses (Gelseal, Vascutek, Scotland UK) was studied.
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  Institutional clinical research.
  
  
  METHODS
  Ten patients who underwent aortic repair for abdominal aortic aneurysm (AAA) with the Gelseal graft were studied (Group A). Prior to and immediately following the implantation, the diameter of Gelseal was measured with slide calipers. The external diameter was examined by CT scan 4 weeks following the surgery. Another 10 patients, who had undergone AAA repair with the Gelseal graft more than 2 years earlier (Group B), also were examined by CT scan. Early and late dilation of Gelseal was estimated and the data from the two groups were compared.
  
  
  METHODS
  In Group A, the preimplantation external diameter was 22.6 +/- 2.3 mm while the mean package size (PS) used was 18.7 +/- 2.1 mm prior to implantation. Just after the implantation, the external diameter changed to 22.7 +/- 2.4 mm. Four weeks later, it averaged 24.0 +/- 2.2 mm. In Group B, the PS averaged 19.2 +/- 2.0 mm, while the external diameter measured by CT scan averaged 27.8 +/- 3.4 mm at a mean of 31.3 months following the surgery.
  
  
  RESULTS
  Prior to implantation, the external diameter was 1.21 times that of the PS. Following implantation, it was 1.21 times (immediately after), 1.28 times (4 weeks later), and 1.45 times (31.3 months later) of the PS.
  
  
  CONCLUSIONS
  At an average of 31.3 months following implantation, the external diameter was 45% larger than the PS. Considering that the external diameter was 21% larger than the PS even prior to implantation, the actual dilation rate is estimated as 24% of the PS in the late postoperative period.
authors.affiliation: First Department of Surgery, Kumamoto University School of Medicine, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Utoh
authors.forename: H
authors.initials: H
authors.lastname: Goto
authors.forename: H
authors.initials: H
authors.lastname: Obayashi
authors.forename: T
authors.initials: T
authors.lastname: Hirata
authors.forename: Y
authors.initials: Y
authors.lastname: Miyauchi
mesh_terms: D000368:Aged; D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging / Q000601:surgery*; D001696:Biomechanical Phenomena; D001807:Blood Vessel Prosthesis; D005780:Gelatin; D006801:Humans; D008875:Middle Aged; D011093:Polyethylene Terephthalates; D016062:Porosity; D011446:Prospective Studies; D013997:Time Factors; D014057:Tomography, X-Ray Computed
chemical_list: D011093:Polyethylene Terephthalates; D005780:Gelatin