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Objective This study aimed to identify factors associated with outlet obstruction and high-output stoma (HOS) after ileostomy creation. Summary of background data Ileostomy creation is effective in preventing leakage among patients undergoing low anterior resection for rectal cancer. However, major complications such as outlet obstruction and HOS can occur after surgery. Moreover, these complications cannot be prevented. Methods This retrospective study included 34 patients with rectal cancer who underwent low anterior resection and ileostomy creation at Okayama University Hospital from January 2015 to December 2018. Then, the risk factors associated with outlet obstruction and HOS were analyzed. Results Of 34 patients, 7 (21%) experienced outlet obstruction. In a multivariate logistic regression analysis, advanced T stage (P = 0.10), ileostomy with a short horizontal diameter (P = 0.01), and thick rectus abdominis (RA) muscle (P = 0.0005) were considered independent risk factors for outlet obstruction. There was a significant correlation between outlet obstruction and HOS (P = 0.03). Meanwhile, the independent risk factors of HOS were advanced T stage (P = 0.03) and thick RA muscle (P = 0.04). Conclusions Thick RA muscle and advanced T stage were the common risk factors of outlet obstruction and HOS. Therefore, in high-risk patients, these complications can be prevented by choosing an appropriate ileostomy location according to RA muscle thickness and by preventing tubing into the ileostomy.

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