[Adaptation and effects of ileal reservoir on ileo-proctostomy following total colectomy in dogs].

We examined postoperative adaptation and effects of J-pouch reservoir on ileo-proctostomy following total colectomy in dogs. End to end (E-E; n = 5) or J-pouch (J-P; n = 5) anastomosis was performed after resection of total colon and the rectum 3 cm above the peritoneal reflexion. Gastrointestinal motility with strain gauge force transducers (SG) and transit time with barium meal under the fluoroscopy were recorded 6 months after total colectomy. Then, histological changes of seven specimens from totally resected ileum in J-P and E-E vs control (normal ileum; n = 5) were measured with hematoxylin-eosin and PYY immunohistochemical stains. Propagation rate of interdigestive migrating complex (IMC) from jejunum to ileum was significantly lower in J-P (64.8 +/- 13.2%) than in E-E (98.6 +/- 1.2%) (p < 0.001). Oro-neorectal transit time (ONTT) in E-E (138 +/- 10 min) was shorter (p < 0.05), but ONTT in J-P (189 +/- 26 min) was significantly longer (p < 0.01) than oro-caecal transit time (OCTT) in preoperative control (165 +/- 19 min; n = 10). There was no difference about length of villi among control, E-E and J-P, but length of crypts in J-P (0.59 +/- 0.08 mm) was longer than that in E-E (0.27 +/- 0.02 mm) and normal ileum (0.34 +/- 0.07 mm) (p < 0.01). PYY positive cells in J-P were more than in E-E and control at any site of ileum and total number of PYY positive cells in J-P (168 +/- 18) significantly increased than that in E-E (111 +/- 16) and control (103 +/- 14) (p < 0.05). Thus, increase of PYY positive cells in J-P inhibits gastrointestinal motility and transit. Delayed transit time and crypts elongation were intestinal adaptation that assists the absorption of luminal contents. Therefore, it suggested that J-pouch reservoir had advantage to ileo-proctostomy following total colectomy in dogs.