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。
2
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.