The Glidescope~R (Verathon Medical (UK) Ltd., Aston Sandford, United Kingdom) is a videolaryngoscope, which improves the Cormack and Lehane (CL) grade of laryngoscopy due to its 60° viewing orientation. Notwithstanding this ability to "see around corners", it is impossible to intubate the trachea in 4% of patients using the Glidescope~R, despite a satisfactory glottic view and the use of a preformed stylet or flexible introducer. Reasons for failure include the inability to maneuver the endotracheal tube (ETT) into the glottis or the ETT abutting the anterior portion of the larynx when using the stylet.
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