Laryngoscopic view grading system as initially developed by Cormack and Lehane.12 A: Grade I, the glottis is completely visible. Laryngoscopic view grading system as initially developed by Cormack and Lehane.12 A: Grade I, the glottis is completely visible. B: Grade II, only the posterior commissure or posterior portion of the laryngeal aperture is visible. C: Grade III, only the epiglottis is visible. D: Grade IV, no glottic structures are visible, only the soft palate. Stephen R Collins Respir Care 2014;59:850-864 (c) 2012 by Daedalus Enterprises, Inc.