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The incidence of postoperative severe complications is reported to be high in patients undergoing emergency surgery for severe ulcerative colitis (UC). It has also been reported that the preoperative inflammatory status is associated with the frequency of postoperative complications. The neutrophil-to-lymphocyte ratio (NLR) is a simple and useful parameter for determining the inflammatory status. Methods In the present study, we retrospectively investigated the correlation between the NLR and the incidence of severe postoperative complications in patients undergoing emergency surgery for severe UC. A total of 105 UC patients who underwent emergency or semi-emergency surgery were enrolled. Various clinical factors and NLR values were evaluated to identify the risk factors for severe complications. Postoperative complications were stratified by their severity according to the Clavien-Dindo Classification (CD). A postoperative complication of CD IIIb or higher was defined as severe postoperative complications. The incidence of severe complications was 16.2%. Results A multivariate analysis revealed the ASA score, toxic megacolon, and NLR to be independent risk factors for severe postoperative complications. Conclusions The results of this retrospective study suggest that the NLR is an independent risk factor for severe postoperative complications in patients undergoing emergency surgery for UC.

Preoperative Neutrophil-to-Lymphocyte Ratio Is Correlated with Severe Postoperative Complications After Emergency Surgery for Ulcerative Colitis