Objective To study the correlation between urinary retention and epidural space when postoperative continues epidural analgesia (PCEA) with morphine and bupivacaine.

目的观察吗啡与布比卡因配伍用于不同间隙硬膜外麻醉术后持续镇痛时，尿潴留的发生与穿刺间隙的相关性。

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Objective To investigate the effect of patient controlled epidural analgesia (PCEA)using low concentration bupivacaine and morphine on immunity function of the carcinoma patient after surgery.

目的探讨病人自控硬膜外低浓度布比卡因复合小剂量吗啡镇痛对肿瘤病人术后免疫功能的影响。

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