Cooled feline intestine and fresh intestine did not differ in enterotomy leak pressure testing or in gross wall thickness measurement

Objective: To report gross anatomical gastrointestinal measurements and compare enterotomy leak pressures between fresh and cooled feline cadavers. Study Design: Ex vivo, randomized study. Animals: Fresh feline cadavers (n = 20). Methods: Jejunal segments (8 cm) were harvested on the same day as euthanasia. From each cadaver, one segment was randomly assigned to control (C), fresh enterotomy (FE), and cooled enterotomy (CE) groups. Enterotomy construction and leak testing were performed within 12 h of euthanasia for the C and FE groups and after 17-29 h of cooling for the CE group. Initial leak pressure (ILP) and maximum intraluminal pressure (MIP) were compared. Gastrointestinal wall thickness and intraluminal diameter were measured on harvested applicable gastrointestinal divisions at up to three time points: day 1 fresh, day 2 cooled, and day 3 cooled. Results: The mean (+/- SD) ILPs for the C, FE, and CE constructs were 600 (+/- 0.0), 200.3 (+/- 114.7), and 131.3 (+/- 92.6) mmHg, respectively. The C ILP was higher (p < .001) than the FE and CE ILP. The ILP (p = .11) and the MIP (p = .21) did not differ between the FE and CE constructs. Wall thickness (measured in mm) did not differ between duodenum day 1 fresh and day 2 cooled groups (p = .18) or between any jejunum day groups (p = .86). The intraluminal diameters (mean +/- SD) for the duodenum, jejunum, and ileum were 5.7 (+/- 0.7), 5.8 (+/- 0.8), and 7.2 (+/- 2.2) mm, respectively. Conclusion: No difference was appreciated between FE and CE ILP and MIP. Wall thickness measurements did not differ between days for duodenum or jejunum. Clinical relevance: Cadaveric feline intestine cooled for up to 29 h may be used for determining intestinal leak pressures.