Difficult Airway Anticipation

Why this matters

Failed airways often start with “this should be easy.” On scene you do not get a full ear, nose, and throat exam. You see obesity, blood, vomit, trauma, a stiff neck, and a loud scene.

Spotting a hard airway early matters as much as the look itself. Every high-risk airway gets a Plan A, Plan B, and Plan C said out loud before you commit. Include a plan to keep giving oxygen if the tube fails.

Clinical sequence

1. Name what you see. Look for a beard, trauma, obesity, limited neck movement, blood, or vomit.
2. Say Plan A, Plan B, and Plan C out loud. Include how you will give oxygen if the tube fails.
3. Turn suction on and open the backup device before the first look.
4. If bag-valve-mask (BVM) ventilation is already hard, expect the advanced airway to be hard too. Do not assume the tube will fix oxygenation.

What You Can See from the Door

• A beard, blood, vomit, obesity, a cervical collar, stridor, or a short neck matters more on scene than a hospital Mallampati score you cannot perform.
• Also look at the outside of the face. Facial trauma, a small jaw, a large tongue, and pregnancy change the plan.
• If the patient cannot open the mouth enough for an airway adjunct, plan for a hard airway. Hospital scores such as Mallampati and 3-3-2 do not run the call. Extreme limits still matter. A perfect score does not make the airway easy.
• Angioedema, an abscess, a foreign body, or an obstructive sleep apnea body habitus can block the airway you are counting on.
• A cervical collar, a curved spine, rheumatoid arthritis, or trauma can stop the neck from moving.

History That Changes the Plan

• Ask about a prior difficult intubation, neck radiation, a tracheostomy, or known airway cancer.
• Stridor, drooling, or sitting forward and bracing means do not lay the patient flat just to examine them. Sitting forward and bracing is the tripod position.
• A full stomach, gastrointestinal bleeding, or drowning means a high risk of aspiration.
• A hypoxic patient who is fighting you still needs a plan for failure. Say what you will do if sedation and the tube do not work.

Speak the Plan Before You Look

1. Set up the basics first. Position the head. Have suction ready. Plan a two-person BVM. Place adjuncts. Give high-flow oxygen. Stage waveform capnography. End-tidal carbon dioxide (EtCO₂) is the carbon dioxide waveform on the monitor.
2. Assign roles. Say who bags, who suctions, who opens the backup device, and who times the attempts.
3. Limit attempts to the number in your protocol. Each failed look adds swelling and hypoxia.
4. Move to rescue early. Use a supraglottic airway (SGA), a better BVM seal, or a call for help. Use a cannot-intubate-cannot-oxygenate pathway only if you are trained and authorized.
5. Write down the predictors and the plan. The emergency department needs to know you expected this.

Teaching points

• A difficult airway is often a preparation problem, not only a laryngoscope skill problem.
• If BVM ventilation is difficult, assume the advanced airway will also be difficult until you prove otherwise.
• A patient who is not breathing still needs a plan to keep oxygen going. Do not hope the tube will fix it.
• This lesson does not teach rapid sequence intubation drug doses or surgical technique. Those belong to your protocol and hands-on training.

Common errors

• Taking the first look with suction off and no backup device open.
• Taking several attempts without giving oxygen between tries.
• Ignoring warning signs because the crew always gets the tube.
• Not checking the airway again after every move. A difficult airway is more likely to move out of place.

Practice

Related: Failed Oxygenation: DOPE-S, Effective BVM Ventilation.

Sources & Further Study

Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.

• NASEMSO National Model EMS Clinical Guidelines (2022) — U.S. EMS model language; follow your protocol
• Difficult Airway Society (DAS) guidelines
• ASA 2022 Practice Guidelines for Management of the Difficult Airway
• Look, Evaluate, Mallampati, Obstruction, and Neck (LEMON) predictors are common teaching aids. They do not replace your RSI or difficult-airway protocol.