ISOFLURANE IN A CIRCLE SYSTEM WITH LOW GAS FLOW

Isoflurane was administered from a Goldman vaporizer to a circle breathing system with low fresh gas flows. The uptake and vapour concentration of isoflurane were compared in two groups of spontaneously breathing patients receiving oxygen alone (n =19), or nitrous oxide and oxygen (n =30). Anaesthesia was maintained successfully in all patients. The authors believe this to be a safe and economical way of delivering isoflurane.