title: Multilayered small intestinal submucosa is inferior to autologous bowel for laparoscopic bladder augmentation.
abstract: OBJECTIVE
  Bladder augmentation is most commonly performed with ileum. However, porcine small intestinal submucosa has been reported as a substitute for bowel for incorporation into the urinary tract. We assessed the feasibility and long-term 12-month results of laparoscopic bladder augmentation with ileum or multilayered small intestinal submucosa (Cook Biotech, Spencer, Indiana) in a porcine model.
  
  
  METHODS
  We performed laparoscopically assisted hemicystectomy and bladder augmentation in 24 female Yucatan mini-pigs using an ileal segment (12) or multilayered small intestinal submucosa (12). The followup protocol included anesthetic bladder capacity, renal ultrasonography and serum chemistry. At 3, 6 and 12 months, respectively, 4 animals per group were scheduled for sacrifice and pathological analysis.
  
  
  RESULTS
  Despite longer anastomotic time in the multilayered small intestinal submucosa group (120 versus 91 minutes, p = 0.026) total operative time was similar in the 2 groups. In each group bladder capacity increased with time but by 12 months bladder capacity was significantly better in the bowel than in the small intestinal submucosa group (825 versus 431 cc, p = 0.016). At 3 months pathological evaluation revealed that the multilayered regenerated bladder patch had shrunken and by 6 months it was replaced by dense calcified scar tissue. Long-term 6 and 12-month bladder capacity in the small intestinal submucosa group was the result of the regeneration of native bladder with exclusion of the whole multilayered patch in the majority of cases.
  
  
  CONCLUSIONS
  Laparoscopic bladder augmentation using multilayered small intestinal submucosa produced functional and pathological results inferior to those of bowel at 12-month followup in a porcine model.
authors.affiliation: Department of Urology, Indiana University School of Medicine, and Methodist Hospital Institute for Kidney Stone Disease, Indianapolis, Indiana, USA.
authors.forename: Ryan F
authors.initials: RF
authors.lastname: Paterson
authors.forename: David A
authors.initials: DA
authors.lastname: Lifshitz
authors.forename: Stephen D W
authors.initials: SD
authors.lastname: Beck
authors.forename: Tibério M
authors.initials: TM
authors.lastname: Siqueira
authors.forename: Liang
authors.initials: L
authors.lastname: Cheng
authors.forename: James E
authors.initials: JE
authors.lastname: Lingeman
authors.forename: Arieh L
authors.initials: AL
authors.lastname: Shalhav
mesh_terms: D000818:Animals; D005240:Feasibility Studies; D007082:Ileum / Q000473:pathology / Q000637:transplantation*; D007413:Intestinal Mucosa / Q000473:pathology / Q000637:transplantation*; D010535:Laparoscopy / Q000379:methods*; D013552:Swine; D014182:Transplantation, Autologous; D001743:Urinary Bladder / Q000473:pathology / Q000601:surgery*; D014563:Urodynamics / Q000502:physiology; D014945:Wound Healing / Q000502:physiology