The LEMON mnemonic for predicting the difficult emergency airway

Look externally

Evaluate 3-3-2^*

Mallampati

Obstruction/Obesity

Neck mobility

* Adequate mouth opening and thyromental distance should be the width of three of the patient's fingers. The distance between the mandible and superior notch of the thyroid cartilage should be the width of two fingers.

Adapted from: Brown III CA, Walls RM. Identification of the difficult and failed airway. In: The Walls Manual of Emergency Airway Management, 5^th ed, Brown III CA, Sakles JC, Mick NW (Eds), Wolters Kluwer, Philadelphia 2018.

Graphic 64336 Version 7.0

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The LEMON mnemonic for predicting the difficult emergency airway