Smoke Inhalation & the Airway Clock
Objective: Spot the inhalation airway that will swell, give oxygen, and move toward a facility that can manage a difficult burn airway.
Why This Is Hard
They walked out of the house talking. Twenty minutes later they cannot swallow. ABA and burn-center teaching: inhalation injury is a clinical suspicion (closed space, soot, carbonaceous sputum, voice change, singed hairs) — not a waiting game for a normal room-air sat.
- High-flow oxygen. CO makes pulse ox look better than the patient.
- Do not wait for a carboxyhemoglobin number you do not have.
- If the voice is changing, this is an airway-capable / burn-center destination, not a clinic.
Field Rules (Education)
- Clues: closed-space fire, soot around mouth/nose, singed nasal hair, carbonaceous sputum, hoarseness, stridor, facial burns.
- Oxygen: treat as CO-exposed until proven otherwise — high FiO₂ per protocol. Pulse ox lies in CO.
- Airway: if they are still talking, position, oxygen, and go. Repeated “just one more look” on scene while the neck swells is how you get a CICO in the truck.
- Cyanide is a protocol/antidote question in some systems (soot + shock + arrest in a fire). Follow yours; this site does not publish an antidote dose.
Field Pitfalls
- Trusting SpO₂ 100% in a house fire.
- Clinic destination for facial burns and a changing voice.
- RSI on a whim without a CICO plan because “they might swell.”
Practice
60-second drill
Partner: apartment fire, soot, hoarse whisper, SpO₂ 99%. Name oxygen plan, destination theme, and one thing the pulse ox cannot tell you.
Related: Burns, Carbon monoxide.
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; protocol still wins
- American Burn Association — inhalation injury and burn-center referral themes — follow your destination protocol
- AHA 2025 Part 10: Special Circumstances — cyanide is a fire-related special circumstance; treat concurrent CO as a high-FiO₂ destination problem
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.