Correct patient oxygenation will be performed during 3-5 minutes, with an inspiratory oxygen fraction of 100% using a correctly sealed face mask, with the aim of achieving an end-tidal O2 level of over 90% (ETO2 > 0.9). Following the above, anesthesia induction will be carried out with fentanyl (1-2 µg kg-1), propofol (2-3 mg kg-1) and rocuronium (0.6 mg kg-1). Endotracheal intubation will be performed when TOF = 0. Conventional laryngoscopy will be carried out using a Macintosh blade in all patients, recording the exploration times and the best laryngeal visualization achieved (using the Cormack-Lehane scale and percentage of glottic opening [POGO]) with or without BURP (backward, upward and rightward pressure on the thyroid cartilage) maneuvering. The best laryngeal vision achieved after these maneuvers will be recorded. The TotalTrack (TTK) video laryngeal mask will then be placed.