In preparation for airway simulation lab, we read:
Reed MJ, Dunn MJG, McKeown DW. 2005. Can an airway assessment score predict difficulty at intubation in the emergency department? Emerg Med J. 22(2):99-102.
Take home points:
LEMON criteria: (L- Look externally for characteristics known to cause difficulty; E- Evaluate the 3-3-2 rule; M- Mallampati; O- Obstruction; N-Neck mobility), and compared their findings to patients’ laryngoscopic view. They found that patients were more likely to have a poor laryngoscopic view if they had large incisors; reduced inter-incisor distance; or reduced thyroid to floor of mouth distance. From this, they proposed the following airway assessment score:
- Number of positive unfavorable “look” criteria: 0-4 points
- Mouth opening less than 3 finger breadths: 1 point
- Hypo-mental distance less than 3 finger breadths: 1 point
- Thyro-hyoid distance less than 2 finger breadths: 1 point
- Presence of an obstructed airway: 1 point
- Presence of poor neck mobility: 1 point
The more points a patient has may correlate with a more difficult laryngoscopic view.