Optiflow Preoxygenation

Optiflow can be used to prolong the apnoea period under anaesthesia without falls in blood oxygen saturation. This study is designed to assess whether the Optiflow system can efficiently replace conventional anaesthetic mask and circuit preoxygenation so that it could be used in emergency anaesthesia. If so, it would be then be in place in the case of difficult or failed intubation to maintain oxygenation ie: it could preoxygenate and then maintain oxygenation seamlessly.