Comparing fibreoptic-guided tracheal intubation using two supraglottic devices: Ambu AuraGain Laryngeal Mask Airway 'Registered Trademark' and LMA Fastrach 'Registered Trademark'

INTERVENTION: Ambu AuraGain LMA 'Registered Trademark'. The Ambu AuraGain will be inserted and after achieving satisfactory ventilation via the supraglottic airway device, fibreopitc‐guided tracheal intubation will then commence. A maximum of 2 attempts at intubation will be given. The intubation will be performed by an experienced anaesthetist (>10 years’ since commencement of specialist training) who is familiar with the use of both devices (>10 uses on each device) prior to the study. Assessment of any complications will occur directly post‐operatively in recovery by the anaesthetist performing the intubation. CONDITION: difficult airway intubation PRIMARY OUTCOME: Comparison of fibreoptic scores which evaluate the laryngeal alignment according to the standardized scale proposed by Brimacombe SECONDARY OUTCOME: Any complications associated with the intubation will be recorded, such as, injury to lips, oral mucosal and dentition, hypoxia (SpO2 < 90%) during intubation, sore throat, dysphagia and dysphonia Number of fibreoptic‐guided intubation attempts (a failed intubation is defined as complete withdrawal of the fibreoptic scope from the patient following unsuccessful placement). Number of insertion attempts with the allocated SAD (a failed insertion attempt is defined as complete withdrawal of the device from the mouth following an unsuccessful placement). Time needed to insert the supraglottic device (SAD) Time taken for endotracheal intubation INCLUSION CRITERIA: ASA I, II or III and > 18 years of age, who are scheduled for surgery requiring oro‐tracheal intubation at the Royal Melbourne Hospital will be recruited for this study.