Figure 1.

Modified Mallampati scoring (A) and Cormack-Lehane grading of glottis exposure on direct laryngoscopic views (B). (A) Class I: visualization of the hard palate, soft palate, fauces, uvula and pillars; Class II: visualization of the hard palate, soft palate, fauces, and base of uvula; Class III: visualization of the hard palate, soft palate; Class IV: only hard palate is visible. (B) Grade I: full view of the glottis; Grade II: partial view of the glottis or arytenoids; Grade III: only the epiglottis is seen; and Grade IV: neither glottis nor epiglottis are visible. Grade I and II were categorized as easy laryngoscopy; Grade III and IV were categorized as difficult laryngoscopy.