以下对大肠癌术后结肠造口患者的护理措施中,正确的是
A. 结肠造口一般于术后1周开放
B. 当造口袋内容物超过1/2时,应及时更换
C. 结肠造口开放后即应开始扩肛,以防造口狭窄
D. 后7~10天切忌灌肠,以免影响伤口愈合
E. 造口开放前应用干的无菌纱布敷盖结肠造口,避免感染
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