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Lesson

Angioedema: The Airway That Swells Shut

12 min Airway & Breathing Skip to quiz

Objective: Recognize progressive lip/tongue/floor-of-mouth swelling as a time-critical airway, oxygenate without serial failed looks, and choose a destination that can do a surgical airway.

Why This Is Hard

They can still talk, so crews stay and “watch.” ACE-inhibitor angioedema can progress after the last pill. Allergic angioedema may need epinephrine; ACE-I and hereditary often do not melt with epi. DAS/ASA difficult-airway teaching: a swelling upper airway is a predicted difficult airway. The street mistake is three looks while the mouth disappears.

On this truck
  • Sit them up. High-flow oxygen. Suction ready. Do not lay a swelling tongue flat unless they arrest.
  • Epinephrine IM if this is anaphylaxis (hives, wheeze, shock). Isolated ACE-I tongue swelling may not be an epi problem — still treat anaphylaxis if that picture is present.
  • You need a hospital that can do a surgical airway. This is not a “wait and see in the ambulance bay” call.

Street Sequence

  1. ABCs from the door: voice, drool, floor-of-mouth, stridor, sat.
  2. Sit up. Oxygen. IV/IO if you can without delaying exit. Monitor.
  3. If anaphylaxis features: IM epinephrine per protocol (see anaphylaxis lesson). Do not withhold epi because you are “not sure of the ACE-I story.”
  4. Do not start a recreational laryngoscopy. If they still oxygenate, move. If they do not, SGA or trained FONA per protocol — not a fourth DL.
  5. Destination: ED with difficult-airway / surgical backup. Advise early.

Field Rules (Education)

  • Three flavors: allergic (epi-responsive picture), ACE-inhibitor (often no hives), hereditary/C1-inhibitor (family history, can be abdominal too). You may not sort them on scene.
  • The mouth is the clock: voice change, drooling, floor-of-mouth firmness, stridor. Photographing the tongue is not a treatment.
  • Intubation is predicted difficult: swelling hides landmarks. Serial looks make it worse. SGA may buy time; FONA is the rescue if CICO.
  • Epi is for anaphylaxis: it is not a reliable reversal for ACE-I angioedema. Do not delay destination waiting for the tongue to shrink.
Say out loud
  • Swelling airway — sitting up, oxygen on
  • Anaphylaxis features? Epi IM if yes
  • Not collecting looks on a disappearing mouth
  • Need a surgical-airway capable ED

Field Pitfalls

  • Waiting in the driveway because they can still speak in sentences.
  • Three DL attempts “before it gets worse.”
  • Skipping IM epinephrine because the bottle said lisinopril and you assumed it cannot be anaphylaxis.

Practice

60-second drill

Partner: 62-year-old on lisinopril, tongue filling the mouth, sat 94% sitting, no hives. First three actions and destination sentence. Then: same patient now stridulous at 86%. Airway plan in one line.

Related: Anaphylaxis Recognition, Front-of-Neck Access.

Sources & Further Study

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

Education only. Apply learning within your protocols and medical direction. This is not clinical care guidance.

Check Your Understanding

Street decisions from this lesson only. After you check, the key is highlighted. Education practice — not a certification exam.

1. A patient on an ACE inhibitor with a rapidly swelling tongue and no hives:
2. IM epinephrine is most clearly indicated when:
3. The worst plan for a disappearing oropharynx is:
4. Voice change plus floor-of-mouth swelling means:
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