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Nitrous oxide analgesia and altitude
Author(s) -
JAMES M. F. M.,
MANSON E. D. M.,
DENNETT J. E.
Publication year - 1982
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1111/j.1365-2044.1982.tb01100.x
Subject(s) - nitrous oxide , altitude (triangle) , medicine , analgesic , anesthesia , effects of high altitude on humans , oxygen , chemistry , mathematics , geometry , organic chemistry , anatomy
Summary The analgesic effectiveness of 50% nitrous oxide and oxygen or oxygen‐enriched air, measured by variations in pain threshold, was studied at an altitude of 1460 m and simulated altitudes of sea level and 3300 m. At sea level pressures, 50% nitrous oxide exerted a similar analgesic effect to that found for morphine, raising the pain thresholds by a mean of 71.5%. At 1460 m, the increase in pain threshold produced was 40% and at 3300 m the increase in pain threshold was only 19%. The difference between the analgesic effects of nitrous oxide at each altitude was statistically significant. It is concluded that moderate altitudes significantly reduce the effectiveness of nitrous oxide in a manner directly related to the partial pressure of nitrous oxide at each altitude.