Enhanced continent mechanism of tapered ileum by extramural support from pouch-abdominal wall: An experimental study in dogs

Purpose: To construct a reliable continent tube, which is easy to catheteri ze, we created and evaluated a new continent cutaneous diversion using a ta pered ileum combined with extramural support from the pouch-abdominal wall. Materials and Methods: Six dogs underwent a procedure in which two ileal se gments were tapered and anastomosed to the ileal pouch. One of the segments (continent) was placed between the back surface of the rectus muscle and t he wall of the ileal pouch creating a continent tube. The other segment (co ntrol) was brought out into the abdominal skin directly without any support from the pouch-abdominal wall. Urodynamic and radiological studies were ca rried out postoperatively in all dogs. Results: In the continent tubes, the maximum closure pressure with a full p ouch was significantly higher than those with an empty pouch (p < 0.01). Th e maximum closure pressures of the continent tubes were significantly highe r than those of the control tubes when the pouch was empty (p < 0.01). The leak point pressures of the continent tubes were significantly higher than those of the control tubes (p < 0.001). In all dogs, the retrograde radiogr am of the continent tubes showed perfect canalization without stenosis. Conclusion: This study suggests that the continent mechanism of tapered ile um can be greatly enhanced by fixing it between the abdominal and pouch wal ls, also allowing easy catheterization in contrast to the submucosal tunnel technique.