Comparison of CTrach, Intubating Laryngeal Mask Airway (ILMA) and I-gel for Tracheal Intubation

Various supraglottic airways may be used as a dedicated airway for insertion of intubating fibrescope and tracheal intubation in the patients with difficult to manage airways (Difficult Airway Society Guidelines). The investigators aim to compare three different types of supraglottic device as a conduit for tracheal intubation - CTrach optical laryngeal mask, Intubating laryngeal mask airway and I-gel supraglottic airway. Null hypothesis for this study is that all three devices will perform without statistical difference in the means of success rate and time needed for their insertion and tracheal intubation.