It is actually defined since the minimal alveolar concentration of inhaled anesthetic at which 50% of people don't shift in reaction to noxious stimuli. Thus N2O is often a weak anesthetic inhalational agent but has excellent analgesic consequences. The reversal might occur at the end of anesthesia when nitrous oxide https://mariosjxnc.ageeksblog.com/35514587/nitrous-oxide-canisters-an-overview