【单选题】【消耗次数：1】
对于术前肠道准备，描述正确的是（）
①
不能降低术后腹腔感染率
②
不能降低术后吻合口瘘发生率
③
会增加麻醉后低血压的风险
④
会导致肠管水肿
⑤
以上都是
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【单选题】
预防性应用抗生素有助于降低择期腹部手术后感染的发生率。使用原则
①
预防用药应针对可能的污染细菌种类
②
应在切皮前30~60min输注完毕
③
尽量选择单一抗菌药物预防用药
④
如果手术时间>3h或超过所用药物半衰期的2倍以上，或成年患者术中出血量超过1500mL时，可在术中重复使用1次
⑤
以上都是
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