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Laryngoscope View Grading

Grade Visible Structures
Grade I Most of the glottis visible
Grade II Posterior portion of glottis visible
Grade III Only epiglottis visible
Grade IV Epiglottis not visible

Explanation

Cormack and Lehane classified the difficulty of visualizing the glottis using a laryngoscope into four grades.

References

Research Paper Chinese Medical Association, Anesthesia Branch. Guidelines for Difficult Airway Management (2017). December 2017.
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