title: Sevoflurane Output in the Isoflurane/Halothane Diamedica Draw-over Vaporiser.
abstract: BACKGROUND
  Draw-over anaesthesia remains an attractive option for conduct of anaesthesia in austere conditions. The Diamedica Draw-over Vaporiser (DDV) is a modern draw-over vaporiser and has separate models for isoflurane/halothane and sevoflurane.
  
  
  METHODS
  A laboratory study was done to measure sevoflurane output in an isoflurane/ halothane DDV. We did 3 series of experiments with the isoflurane/halothane DDV. We measured anaesthetic agent output in both push-over and draw-over setups, and at minute ventilation of 6 L/min and 3 L/min. Series 1 experiment was done with isoflurane in the DDV at ambient temperature of 20°C. Series 2 experiment was done with sevoflurane in the DDV at ambient temperature of 20°C. Series 3 experiment was done with sevoflurane in the DDV and with the DDV placed in a water bath of 40°C.
  
  
  RESULTS
  The sevoflurane output was found to be two-thirds of the isoflurane/ halothane DDV dial setting at ambient temperature of 20°C. With the DDV in a 40°C water bath, the sevoflurane output was found to be about the isoflurane/ halothane DDV dial settings.
  
  
  CONCLUSIONS
  In our experiment, we show that it is possible to use sevoflurane in an isoflurane/halothane DDV.
authors.affiliation: Department of Anaesthesia, National University Hospital, Singapore.
authors.forename: Woo Chiao
authors.initials: WC
authors.lastname: Tay
authors.forename: Wah Tze
authors.initials: WT
authors.lastname: Tan
mesh_terms: D000769:Anesthesia, Inhalation / Q000295:instrumentation* / Q000379:methods; D018685:Anesthetics, Inhalation / Q000008:administration & dosage*; D006221:Halothane; D006801:Humans; D007530:Isoflurane; D008738:Methyl Ethers / Q000008:administration & dosage*; D009330:Nebulizers and Vaporizers; D000077149:Sevoflurane; D013696:Temperature
chemical_list: D018685:Anesthetics, Inhalation; D008738:Methyl Ethers; D000077149:Sevoflurane; D007530:Isoflurane; D006221:Halothane