The effects of nitrous oxide, at sea-level and at an altitude of 1700 m, were assessed on a subjective and objective basis. Only marginal differences were shown between the effects of the gas at sea-level and 1700 m. Since consciousness was impaired with 60 and 70% nitrous oxide it is suggested that the use of Entonox-oxygen mixtures should be considered for single-handed operators.
Adult Altitude