Background/aims: The purpose of this study was to determine the most useful predictive scoring system for the postoperative mortality of patients with colorectal perforation using the Acute Physiological and Chronic Health Evaluation II (APACHE II), Sequential Organ Failure Assessment (SOFA) and Physiological and Operative Severity Score for the enUmeration of Mortality (POSSUM).
Methodology: First, the 3 scoring systems were applied to all patients, and the efficacy of these systems was compared between survivors and non-survivors. Second, using receiver operating characteristic (ROC) curve analysis, optimal cut-off values were determined for each system and patients were divided into another two groups (high score group and low score group). Then statistical analyses were performed, respectively.
Results: All scoring systems gave significantly lower scores for survivors than for non-survivors. POSSUM was the most sensitive system for predicting operative mortality (POSSUM: sensitivity 87.5%). Kaplan-Meier analysis and log rank test revealed that there were significant differences between the high score group and the low score group, except for APACHE II. Multivariate logistic regression analysis revealed that only POSSUM was an independent predictor (odds ratio, 0.858; 95% C.I.; 0.736-1,000; p = 0.0498).
Conclusions: POSSUM is an optimal predictor of mortality following emergency surgery for colorectal perforation.
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