Parbrook GD, Rees GAD, Robertson GS. Relief of postoperative pain: comparison of a 25% nitrous-oxide and oxygen mixture with morphine. BMJ1964; ii: 480– 82.
2.
Donen N, Tweed WA, White D, Guttormson B, Enns J. Pre-hospital analgesia with Entonox. Can Anaesth Soc J1982; 29: 275–279.
3.
Triner WR, Bartfield JM, Birdwell M, Raccio-Robak N. Nitrous oxide for the treatment of acute migraine headache. Am J Emerg Med1999; 17: 252–254.
4.
Burton JH, Auble TE, Fuchs SM. Effectiveness of 50% nitrous oxide/50% oxygen during laceration repair in children. Acad Emerg Med1998; 5: 112–117.
5.
Keating HJ, Kundrat M. Patient-controlled analgesia with nitrous oxide in cancer pain. J Pain Symptom Manage1996; 11: 126–130.
6.
Fosburg MT, Crone RK. Nitrous oxide analgesia for refractory pain in the terminally ill. JAMA1983; 250: 511–513.
7.
Serlin RC, Mendoza TR, Nakamura Y, Edwards KR, Cleeland CS. When is cancer pain mild, moderate or severe? Grading pain severity by its interference with function. Pain1995; 61: 277–284.
8.
Petzke F, Radbruch L, Zech D, Loick G, Grond S. Temporal presentation of chronic cancer pain: transitory pains on admission to a multidisciplinary pain clinic. J Pain Symptom Manage1999; 17: 391–401.
9.
Swanwick M, Haworth M, Lennard RF. The prevalence of episodic pain in cancer: a survey of hospice patients on admission. Palliat Med2001; 15: 9–18.
10.
Louis-Ferdinand RT. Myelotoxic, neurotoxic and reproductive adverse effects of nitrous oxide. Adverse Drug React Toxicol Rev1994; 13: 193–206.
11.
de Wit R, van Dam F, Abu-Saad HH, et al. Empirical comparison of commonly used measures to evaluate pain treatment in cancer patients with chronic pain. J Clin Oncol1999; 17: 1280–1287.
