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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effect of fresh gas flow on isoflurane concentrations during low-flow anaesthesia.

The effect of fresh gas flow (FGF) on isoflurane concentrations at given vaporizer settings during low-flow anaesthesia was investigated. Ninety patients (American Society of Anaesthesiologists physical status I or II) were randomly allocated to three groups (FGF 1 l/min, FGF 2 l/min and FGF 4 l/min). Anaesthesia was maintained for 10 min with vaporizer setting isoflurane 2 vol% and FGF 4 l/min for full-tissue anaesthetic uptake in a semi-closed circle system. Low-flow anaesthesia was maintained for 20 min with end-tidal isoflurane 1.5 vol% and FGF 2 l/min. FGF was then changed to FGF 1 l/min, FGF 2 l/min or FGF 4 l/min. Measurements during the 20-min period showed that inspired and end-tidal isoflurane concentrations decreased in the FGF 1-l/min group but increased in the FGF 4-l/min group compared with baseline values. No haemodynamic changes were observed. Monitoring of anaesthetic concentrations and appropriate control of vaporizer settings are necessary during low-flow anaesthesia.[1]


  1. Effect of fresh gas flow on isoflurane concentrations during low-flow anaesthesia. Park, J.Y., Kim, J.H., Kim, W.Y., Chang, M.S., Kim, J.Y., Shin, H.W. J. Int. Med. Res. (2005) [Pubmed]
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