title: A comparison of vital capacity breath and tidal breathing techniques for induction of anaesthesia with high sevoflurane concentrations in nitrous oxide and oxygen.
abstract: Vital capacity breath and tidal breathing techniques were compared for induction of anaesthesia with 7.5% sevoflurane in nitrous oxide, and oxygen. Thirty five subjects were randomly assigned to a vital capacity breath group (19) or to a tidal breathing group (16). The mean time for induction was faster with vital capacity breath (41 s) than with tidal breathing (52 s, p < 0.05). Some involuntary movements were seen in the tidal breathing group but none in the vital capacity breath group. Coughing was seen in a quarter of the subjects in the tidal breathing group and in one subject of the vital capacity breath group. The vital capacity group showed excellent characteristics: rapid, and pleasant induction without premedication. We conclude that the vital capacity breath technique is necessary for the inhalation induction of anaesthesia; it provides enough overpressure to allow the subject to pass reliably and rapidly through the initial stages of excitement.
authors.affiliation: Asahikawa Medical College, Department of Anaesthesiology and Resuscitology, Hokkaido, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yurino
authors.forename: H
authors.initials: H
authors.lastname: Kimura
mesh_terms: D000328:Adult; D000769:Anesthesia, Inhalation / Q000009:adverse effects / Q000379:methods* / Q000523:psychology; D018685:Anesthetics, Inhalation; D004987:Ethers; D005260:Female; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008738:Methyl Ethers; D009609:Nitrous Oxide; D010100:Oxygen; D010342:Patient Acceptance of Health Care; D000077149:Sevoflurane; D016037:Single-Blind Method; D013990:Tidal Volume; D013997:Time Factors; D014797:Vital Capacity
chemical_list: D018685:Anesthetics, Inhalation; D004987:Ethers; D008738:Methyl Ethers; D000077149:Sevoflurane; D009609:Nitrous Oxide; D010100:Oxygen