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The effect of colon obstruction on colonic anastomotic healing

INTRODUCTION: The healing of intestinal anastomosis has been studied specially the suture technique and materials used in the preparation of anastomosis, and also to the better comprehension of the effects of several factors related to healing. A considerable number of complications after anastomosis of the colon and rectum can be noticed and the colonic obstruction has been as one of the main factors. OBJECTIVE: Study the anastomotic healing in the colon of rats after intestinal obstruction. METHODS: The animals (n=39) were divided in: Group I (submitted to intestinal obstruction induced four days before of the anastomoses, n=22) and Group II (Controls, n=22). The colonic anastomosis were made by a standardized technique and, seven days later, the segments which them were reviewed, resected and analyzed for a hydroxyproline dosage. RESULTS: The complications were more usual in the animals with obstruction (11 rats: 50%) than in the controls (3 rats: 17,7%), p<0,05. The median value of hydroxyproline was higher in the Group I (975,0 x 872,0), p>0,05. CONCLUSION: The anastomosis in the rat's colon with intestinal obstruction is related to more complications. This can be explained by the following factor's: more technical difficulty in the preparation of the anastomosis caused by different diameter of the bowel, higher undernourishment, proximal faecal retention, bacterial translocation and ischaemia. The statistical similarity between the groups regarding to the dosage of hydroxyproline suggests that the healing of the rats' colonic anastomosis with intestinal obstruction, in the absence of complications, follows the same process of collagen synthesis as the controls ones.

colonic healing; colon obstruction; anastomotic healing


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