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BackgroundThe Ulcerative Colitis Endoscopic Index of Severity (UCEIS) and the Mayo Endoscopic Score (MES) were developed as an objective method of the endoscopic severity in ulcerative colitis (UC); however, it was still unclear whether UCEIS vs MES could guide the need for colectomy in acute severe colitis (ASC).MethodsConsecutive ASC patients between January 2012 and May 2016 were retrospectively evaluated. Demographic data, previous therapy, clinical observations, laboratory parameters, medical therapy and endoscopic assessments were documented. The primary outcome was the need for colectomy during admission and follow-up.ResultsNinety-two patients were enrolled. 37 (40.2%) needed colectomy. UCEIS score is a predictor of requirement for colectomy in multivariate analysis (OR, 3.25; 95% CI, 1.77–5.97; P < 0.001). Receiver-operator characteristic (ROC) area of UCEIS is 0.85, with a sensitivity of 60.3% and specificity of 85.5% using cut-off value of 7, which outperforms MES with the ROC area of 0.65; When UCEIS score ≥7, 80% of patients eventually need colectomy.ConclusionUCEIS outperformed MES as a predictor for need for colectomy in ASC patients. The high probability of medical treatment failure and benefits of early colectomy should be discussed in patients with baseline UCEIS ≥ 7.Acute severe colitis; colectomy; Ulcerative Colitis Endoscopic Index of Severity; Mayo Endoscopic Score

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