2Wolf AR,Valley RD,Fear DW.Bupivacaine for caudal analgesia in infants and children:optimal effective concentration.Anesthesiology,1998,69 (1):102-106.
3Murthy BV,Pandya KS,Booker PD,et al.Pharmacokinetics of tramadol in children after i.v.or caudal epidural administration.Br J Anaesth,2000,84(3):346-349.
4Carlsson KH,Jurna I.Effects of tramadol on motor and sensory responses of the spinal nociceptive system in the rats.Eur J Pharmacol,1987,139(1):1-10.
5Güne(s) Y,Se(c)en M,Ozcengiz D,et al.Comparison of caudal ropivacaine,ropivacaine plus ketamine and ropivacaine plus tramadol administration for postoperative analgesia in children.Paediatr Anaesth,2004,14 (7):557-563.
6Batra YK,Prasad MK,Arya VK,et al.Compariscn of caudal tramadol vs bupivacaine for post-operative analgesia in children undergoing hypospadius surgery.Int J Clin Pharmacol Ther,1999,37(5):238-242.