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[Effects of antiperistaltic ileal segment on intestinal motility in subtotally colectomized dogs].

Experimentally, 60 mongorel dogs were subjected to subtotal colectomy with addition of a 5 cm reversed segment of terminal ileum, which was interposed between the small bowel and the residual rectal cuff.Following these animals for 6 monthes after surgery, they showed no remarkable difference of body weight, total serum proteins concentration, or hematocrit value, compared with the control group which were anastomosed isoperistaltically.The addition of a 5 cm reversed intestinal segment prolonged mouth-to-anus transit time, and was very effective for shortening the recovery from diarrhea.Electrical activity was recorded from the immediate cranial portion (portion A), and caudal portion (portion B) of the upper anastomosis and the immediate cranial portion (portion C) of the ileoproctostomy.In company with portion A, both portion B and portion C showed electrophysiologically chronic hypertrophic changes in 24 weeks postoperatively. No propagation of movement beyond the upper anastomotic line was observed.In the reversed ileal segment, peristalsis maintained original direction up to 24weeks after surgery in electrophysiological studies and X-ray cinematographic observations of bowel motility.From observation of X-ray cinematography and the removed specimens, it was supposed that the 5 cm reversed ileal segment was usefull as a reservoir portion after loss of reservoir function of the colon.The clinical application of an antiperistaltic segment of adequate length for patients requiring colectomy would appear feasible.