Data on demagraphy, diagnosis, treatment as well as APACHE Ⅱ and SOFA score within 24 hs of admission were recorded. The included patients were examined by contrast-enhanced abdominal CT, and were devided into two groups, colon oriented group and non-colon oriented group, independently by 2 professionals combining the history and CT results. Non-colon oriented group should met one of the two following crieria: 1. with a history of nerves damage which affect colon movement (colon(-innervating) nerves damage) (such as pevic or retroperitoneal operation, spine injury, cerebral lesion), and non- or mild edema of colonic wall presented on abdominal CT; 2. without a history of colon(-innervating) nerves damage, whereas no obvious change can be seen on CT scan. The others were clarified as colon-oriented group (namely, with a history of colon(-innervating) nerves damage, moderate or more severe edema; without a history of colon(-innervating) nerves damage, whereas mild or sever edema presented ).