Airway Assessment
1. Mouth opening: Incisor distance of 3 cm or greater in adults. 19-3
2. Upper lip bite test: Lower teeth brought in front of upper teeth to test range of motion of temporomandibular joints.
3. Mallampati classification: The greater the tongue obstructs the view of the pharyngeal structures, the more difficult the intubation may be I. Entire palatal arch is visible II. Upper part of faucial pillar and most of uvula are visible III. Only soft and hard palate are visible IV. Only hard palate is visible
4. Thyromental distance: Greater than 3 fingerbreadths is desirable.
5. Neck circumference: Greater than 27 inches suggests difficulty in visualizing glottic opening.
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