• Acta Anaesthesiol Scand · Apr 1999

    Randomized Controlled Trial Clinical Trial

    The sevoflurane-sparing effect of nitrous oxide: a clinical study.

    • I Jakobsson, M Heidvall, and S Davidson.
    • Department of Anaesthesia and Orthopaedic Surgery, Sabbatsberg Närsjukhuset, M&M Medical Inc., Stockholm, Sweden.
    • Acta Anaesthesiol Scand. 1999 Apr 1;43(4):411-4.

    BackgroundWe studied the sevoflurane-sparing effect of nitrous oxide in a prospective randomised study.MethodsForty-two ASA I-II patients scheduled for elective knee arthroscopy under general anaesthesia were randomly assigned to a fresh gas flow consisting of oxygen in air or oxygen in nitrous oxide 1:2. All patients received a standardised anaesthesia consisting of induction with fentanyl and propofol and maintenance with sevoflurane adjusted according to clinical signs. The sevoflurane consumption was studied by means of weighing the vaporiser before and after every anaesthesia.ResultsThe mean sevoflurane consumption was reduced from 0.62 to 0.25 g/min, a 60% reduction, by the use of oxygen in nitrous oxide 1:2 in the fresh gas flow. The emergence was faster for the patients receiving nitrous oxide. No major differences were observed during recovery.ConclusionNitrous oxide was found to be cost-effective for use during short ambulatory knee arthroscopy.

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