Securing the airway is one of the most critical tasks in the ED, but not every airway is straightforward. Anticipating a difficult airway before drugs are given can be the difference between success and disaster. Unlike elective OR settings, emergency physicians have less time, less information, and less controlled environments, so quick bedside assessments are essential.
Why prediction matters
- Prevents “can’t intubate, can’t oxygenate” scenarios.
- Guides the choice of approach: awake vs RSI, VL vs DL, early surgical backup.
- Helps you prepare backup equipment and extra hands.
Core Bedside Mnemonics
1. LEMON (classic for laryngoscopy)
- Look externally – trauma, swelling, facial hair, small mouth, short neck.
- Evaluate 3-3-2 rule – 3 fingers mouth opening, 3 fingers mentum-to-hyoid, 2 fingers hyoid-to-thyroid notch.
- Mallampati – simplified airway view (but less useful in emergencies).
- Obstruction – stridor, foreign body, tumors.
- Neck mobility – c-spine collar, arthritis, ankylosis.
2. MOANS (mask ventilation difficulty)
- Mask seal problems (beard, trauma).
- Obesity/obstruction.
- Age >55.
- No teeth.
- Stiff lungs (asthma, ARDS).
3. RODS (supraglottic device difficulty)
- Restricted mouth opening.
- Obstruction.
- Distorted anatomy.
- Stiff lungs.
4. SHORT (surgical airway difficulty)
- Surgery/trauma scars.
- Hematoma/infection.
- Obesity.
- Radiation changes.
- Tumor.
Quick Clues You Can’t Miss
- Trauma with expanding hematoma → anticipate crash airway.
- Severe facial burns/edema → limited visualization.
- Morbid obesity → ramp early.
- Limited jaw or neck mobility → think video laryngoscopy or awake.
Practical ED Strategy
- Always scan for predictors before RSI – even 5–10 seconds of “look externally” pays off.
- If multiple predictors are present → call for backup, prepare alternate airway device, and consider awake approach.
- Have a surgical airway kit visible for all predicted difficult airways.
- Use video laryngoscopy as first choice if available in predicted difficulty cases.
Rookie Pearls
- Don’t rely solely on Mallampati in the ED—it’s not realistic in most crashing patients.
- Anticipate oxygenation difficulty (MOANS) as much as intubation difficulty.
- Mentally run through LEMON + MOANS before every tube attempt—soon it becomes second nature.
Take-home message: In the ED, predicting a difficult airway isn’t about perfection—it’s about spotting red flags fast and having Plan B, C, and D ready.
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