对于术后镇痛，人们一直积极探讨其给药途径（如静注、肌注、皮下注射、具吸入、硬膜外腔给药等）及药物（吗啡、杜冷丁、芬太尼、曲马多、丁丙诺啡等）。目前，最确切最常用的还是吗啡在硬膜外腔的应用，为探讨3种不同给药方法（连续滴注、病人自控镇痛、单次推注）对剖它产术 For postoperative analgesia, it has been actively explored its route of administration (such as intravenous injection, intramuscular injection, subcutaneous injection, with inhalation, epidural administration) and drugs (morphine, pethidine, fentanyl, More, buprenorphine, etc.). At present, the most accurate and most commonly used or morphine in the application of epidural space, in order to explore the three different methods of administration (continuous infusion, patient controlled analgesia, a single bolus)