6Sinatra R S, Sevarino F B, Paige D, et al. Patient-con-trolled analgesia withsufentanil; a comparison of two dif-ferent methods of administration [ J]. J Clin Anesth,2012,8:123-125.
7Trseda K,Mosca P J,Heine M F. Mood during epiduralpatient-controlled analgesia with morphine or fentanyl[J]. Anesthesionlogy, 1998,88:885-889.
8Wiebalck A, Brodner G, Van A H. The effects of addingsufentanil to bupicaine for postoperative patient-controlledepidural analgesia[J]. Anesth Analg,2011,85:124-126.
9Smith G. Postoperative pain:Aitkenhead A R, Smith G,eds. Text-book of anaesthesia [ M]. 3rd epidtion, NewYork:Churchill Livingstone,2011:407-409.