0.05). CONCLUSION: Colocolonic anastomosis without previous bowel preparation was shown to be safe and efficacious, suggesting it is not an indispensable procedure in colorectal anastomosis surgery.]]>

Objective Evaluate healing response of colo-colic anastomosis by invagination vs. single-layer suture. Methods Sixty dogs were randomly distributed in two groups and anastomosed with single-layer suture (G-I, control) or by invagination and cardinal sutures (G-II, study). In the end, the animals were euthanized (10 from each group on POD7 and 20 on POD21) and the anastomosed segment was retrieved for histology and immunohistochemistry. Parameters included body weight, adhesions, edema, vasoproliferation, type I and III collagen, myeloperoxidase and nitric oxide. Findings were analyzed with Student's t test and the Mann–Whitney test. Results No animal died prior to euthanasia. The groups were similar with regard to all parameters: median weight 10.86 kg (G-I) and 9.98 kg (G-II) on POD7 (p = 0.41) and 11.86 kg (G-I) and 11.55 kg (G-II) on POD21 (p = 0.71); abdominal adhesions (p = 0.7383 POD7; p = 0.5685 POD21), level of edema (p = 0.3006 POD7; p = 0.7990 POD21), vasoproliferation (p = 0.1191 POD7; p = 0.0758 POD21), type I collagen (p = 0.4591 POD7; p = 0.3357 POD21), type III collagen (p = 0.2166 POD7; p = 0.2712 POD21), nitric oxide (p = 0.3980 POD7; p = 0.4796 POD21) and myeloperoxidase (p = 0.580 POD7; p = 0.755 POD21). Conclusion No significant difference in healing response was observed between the two anastomosis techniques (single-layer suture and invagination).

a b s t r a c tObjective: The purpose of this experimental study was to compare the inflammatory and wound healing response of dogs submitted to colonic anastomosis with and without preoperative retrograde enema. Methods:The study included two groups of 31 female dogs (Canis familiaris). G-I (control): no preoperative bowel preparation; G-II (study): preoperative retrograde enema using a 10% glycerin solution. All the animals were submitted to laparotomy and colotomy at 20 cm from the anal verge, followed by closure with a running extramucosal single-layer suture (Prolene ® 000). The animals were then anesthetized and euthanized on the 7th (n = 10) or 21st (n = 20) postoperative day (POD) to remove the anastomosed colon segment for histological and immunohistochemical analysis evaluating the parameters: anastomotic edema, vasoproliferation, abdominal adhesions, type I and III collagen, nitric oxide and myeloperoxidase.The observed differences were analyzed with the Mann-Whitney test for nonparametric data and Student's t test for unpaired samples and parametric data.Results: One animal from G-I and one from G-II died on POD 7 and POD 10 due to anastomotic complications and sepsis, respectively. The groups did not differ significantly with regard to inflammatory and healing parameters, although the levels of mature collagen were significantly lower in the animals submitted to preoperative bowel preparation. ଝ Study carried out at Post-graduation program stricto sensu in

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