Objective: to compare the analgesic effects and aversive side effects of ropivacaine combined with pethidine, morphine or tramadol for postoperative patient control epidural analgesia (PCEA).
目的：比较罗哌卡因伍用哌替啶、吗啡或曲马朵用于术后硬膜外自控镇痛(PCEA)的效果及不良反应。
Aim: To study the clinical effects and aversive side effects of different dosage of droperidol on the post operative patient control epidural analgesia (PCEA) with tramadol.
目的：研究不同剂量氟哌啶对曲马多病人自控硬膜外镇痛(PCEA)效应及副作用的影响。
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