2Murdoch CJ, Crooks BA, Miller CD. Effect of the addition of ketamine to morphine in patient-controlled analgesia. Anaesthesia, 2002, 57 (5): 484-488.
3Reeves M, Lindholm DE, Myles PS, et al. Adding ketamine to morphine for patient-controlled analgesia after major abdominal surgery: a doubleblinded, randomized controlled trial. Anesth Analg,2001,93(1): 116-120.
4DeKock M, Lavand'homme P, Waterloos H. ‘Balanced analgesia'in the perioperative period: is there a place for ketamine? Pain,2001,92(3):373-380.
5Wu CT, Yeh CC, Yu JC, et al. Pre-incisional epidural ketamine, morphine and bupivacaine combined with epidurad and general anaesthesia provides pre-emptive analgesia for upper abdominal surgery. Acta Anaesthesiol Scand,2000,44(1) :63-68.
6Azevedo VM, Lauretti GR, Pereira NL, et al. Transdermal ketamine as an adjuvant for postoperative analgesia after abdominal gynecological surgery using lidocaine epidural blockade. Anesth Analg,2000,91(6): 1479-1482.
7Unlugenc H, Gunduz M, Ozalevli M, et al. A comparative study on the analgesic effect of tramadol, tramadol plus magnesium, and tramadol plus ketamine for postoperative pain management after major abdominal surgery. Acta Anaesthesiol Scand,2002,46(8): 1025
8Himmelseher S, Ziegler-Pithamitsis D, Argiriadou H. Small-dose S(+)- ketamine reduces postoperative pain when applied with ropivacaine in epidural anesthesia for total knee arthroplasty. Anesth Analg, 2001,92(5): 1290-1295.
9Subramaniam B, Subramaniam K, Pawar DK, et al. Preoperative epidural ketamine in combination with morphine does not have a clinically relevant intra- and postoperative opioid-sparing effect. Anesth Analg,2001,93(5):1321-1326.
10Subramaniam K, Subramaniam B, Pawar DK, et al. Evaluation of the safety and efficacy of epidural ketamine combined with morphine for postoperative analgesia after major upper abdominal surgery. J Clin Anesth,2001,13(5) :339-344.
