1Peachey JE. Clinical observations of agonist-antagonist analgesic dependence[J]. Drug Alcohol Depend, 1987,20:347-365
2Jaw SP, Makimura M, Oh KW, et al. Involvement of k-opioid receptors in opioid dependence/withdrawal: studies using butorphanol [J]. Eur J Pharmacol,1994,257: 153-160
3Chang KJ, Wei ET, Killian A, et al. Potent morphiceptin analogs: structure activity relationships and morphine-like activities [J]. J Pharmacol Exp Ther,1983,227: 403-408
4Schatzman U, Armbruster S, Stucki F, et al. Analgesic effect of butorphanol and levomethadone in detomidine sedated horses [J]. J Vet Med A Physiol Pathol Clin Med , 2001, 48 (6):337-342
5Skarda RT, Muir WW 3rd. Comparison of electroacupuncture and butorphanol on respiratory and cardiovascular effects and rectal pain threshold after controlled rectal distention in mares[J]. Am J Vet Res,2003,64(2):137-144
6Guller K, Busato A, Lang M J, et al. Medetomidine-butorphanol combination anesthesia in the dog [J]. Schweiz Arch Tierheilkd, 2001,143 (12):601-605
7Sano T, Nishimura R, Mochizuki M,et al. Effects of midazolam-butorphanol,acepromazine-butorphanol and medetomidine on an induction dose of propofol and their compatibility in dogs[J]. J Vet Med Sci,2003,65(10):1141-1143
8Corlett F, Raisis AA, Brearley JC. Comparison of morphine and butorphanol as pre-anaesthetic agents in combination with romifidine for field castration in ponies[J]. Vet Anaesth Analg,2005,32(1):16-22
9Mosley CA, Dyson D, Smith DA. The cardiovascular dose-response effects of isoflurane alone and combined with butorphanol in the green iguana (Iguana iguana) [J]. Vet Anaesth Analg,2004,31(1):64-72
10Kuo WC, Keegan RD. Comparative cardiovascular, analgesic, and sedative effects of medetomidine, medetomidine-hydromorphone, and medetomidine-butorphanol in dogs [J]. Am J Vet Res,2004,65(7):931-937
5Maharjan SK, Karki CB. Painless delivery - a short experience[ J].Kathmandu Univ Med J (KUMJ) ,2003,1(2) :128 -131.
6Boudou M,Teissfedre F, Walburg V , et al. Association between theintensity of childbirth pain and the intensity of postpartum blues[J]. Encephale,2007,33(5) :805 -810.
7Sheill S. Painless labour[ J]. Practitioner,2010,254(1727) :18.
8M&rtensson L, Wallin G. Sterile water injections as treatment forlow-back pain during labour : a review [ J ]. Aust N Z J ObstetGynaecol,2008 ,48(4) :369 -374.
9Zaric D,Nydahl DA,Philipson L,et al. The effect of continuous 1-umbar epidural infusion of ropivacaine (0. 1%,0. 2% and 0. 3% )and 0. 25% bupivacaine on sensory and motor block in volunteers[J]. Reg Anaesth,1996 ,21 ( 1) : 14.
10Nakahata K. Introduction of labor epidural analgesia in Wakayama[J]. Masui,2007,56(9) :1025 -1031.