3Boulland P,Favier JC, Villevieille T, et al. Premixed 50 % nitrous oxide and oxygen: Theoretical recalls and practical modalities [J]. Ann Fr Anesth Reanim,2005,24(10) : 1305 - 1312.
4Tunstall ME. Obstetric analgesia. The use of a fixed nitrous oxide and oxygen mixture from one cylinder[J]. Lancet,1961,2(7209) :964.
5Meskine N, Vullierme M, Zappa M, et al. Evaluation of analgesic effect of equimolar mixture of oxygen and nitrous oxide inhalation during percutaneous biopsy of focal liver lesions: A double - blind randomized study[J]. Academic Radiology,2011,18(7) : 816 - 821.
6Nicolas V, Collado C, Billo. Efficacy and tolerance of 500//00 N2O/ 50%/00 02 premix when administered by dentists in their private of- fice[J]. European Journal of Pain, 2009,13 :S55 - S285.
7Masood J,Shah N,Lane T,et al. Nitrous oxide inhalation and tol- erance of transreetal ultrasound guided prostatebiopsy: A double- blind randomized controlled study[J]. J Urol,2002,168(1) :116- 200.
8Gallagher G,Rae CP,Kinsella J. Treatment of pain in severe burns [J]. Am J Clin Dermatol,2002,1(6) :329 - 335.
9Kennedy RM, Luhmann JD. Pharmacological management of pain and anxiety during emergency procedures in children[J]. Paediatr Drugs,2001,3(5) :337 - 354.
10Herbert J. Keating Ⅲ, Mary K. Patient - controlled analgesia with nitrous oxide in cancer pain[J]. Journal of pain and Symptom man- agement, 1996,11 (2) : 126 - 130.