Issn Print: 0265-0215

Publication Date: 2004/06/01


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Efficiency of the AnaConDa (Anesthesia Conserving Device) with sevoflurane: in vitro study: A-239

M. Soro; F. J. Belda; M. J. Alcantara; R. Badenes

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Excerpt

Background and Goals: The Anesthetic Conserving Device (AnaConDa; Hudson RCI, Sweden) is a new device for anesthetic vapours delivery. A syringe pump delivers the volatile anesthetic in liquid status to the ACD where the anesthetic is vaporized (1). We evaluated the anesthetic loss from the ACD filter (efficiency) during 24 hours of use at different sevoflurane endtidal concentrations and minute volume ventilation (VE).
Material and Methods: A latex bag of 2300 ml was connected to a Ergo ventilator (Temel, Spain) and mechanical ventilation was adjusted at 10bpm. Infusion rates of liquid sevoflurane to the ACD filter were adjusted during the 24-hour study to obtain a constant end-tidal concentration of 1, 1,5 and 2%. Experiences were performed at VE of 5 and 10 L/min. Anesthetic concentrations were measured using a standard clinical monitor (Vamos, Drager, Germany).
Results: The table shows the total looses in mL per hour, calculated from the difference of sevoflurane administered and retained in the bag (EtSevo times bag volume). Efficiency plot i.e. loss of sevoflurane through the filter (Y axis) related to the product of Et concentration times VE (X axis) is showed in the graph.
Conclusions: Loss of anesthetic through the AnaConDa is directly related to the Et-concentration and the minute volume. Anesthtetic loss was constant throughout the 24-hour period of study.
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