title: Expansion of various types of ileal reservoirs in situ. An experimental study in rats.
abstract: In experiments on rats four types of ileal reservoirs were constructed and left to expand in situ. After 3 months the volumes and tissue weights of the various reservoirs were compared. The reservoir types were: two loops, isoperistaltic (type I), two loops, antiperistaltic (type II), three loops, S-shaped (type III) and "four loops', double-folded U loop (Kock pouch) (type IV). There was a considerable volume increase in all types of reservoir as well as a marked increase in their tissue weight. The expansion of the reservoirs in groups III and IV was significantly greater than that in groups I and II. The difference in expansion could possibly be explained by the greater radius in three- and four-loop reservoirs compared with two-loop reservoirs if Laplace's law is applied to this process. According to this law the tension in the wall of a tube increases with increasing radius.
mesh_terms: D001003:Anal Canal / Q000601:surgery; D000714:Anastomosis, Surgical; D000818:Animals; D007081:Ileostomy; D007082:Ileum / Q000033:anatomy & histology / Q000601:surgery*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D001743:Urinary Bladder / Q000601:surgery*; D014547:Urinary Diversion