Nursing care
Singed nasal hair after a house fire: what the nurse does first
Written and reviewed by Ryan Murphy, MSN, RN, CCRN · 3 min read · Updated October 2026
Short answer
Singed nasal hair, facial burns, soot in the mouth or sputum, and hoarseness after a fire in an enclosed space suggest inhalation injury. Airway swelling can progress over hours, so the airway comes before the skin. The nurse gives 100% oxygen as ordered, watches for stridor, prepares for early intubation and keeps carbon monoxide poisoning in mind.
Why these clues point to the airway
Being trapped in a burning room, carbonaceous sputum, burns around the mouth, singed nasal hairs and redness or swelling at the back of the throat all suggest heat and smoke reached the airway. Heat injury causes swelling that can keep increasing after arrival, so a client who is talking now may struggle to breathe later.
That is why early intubation is recommended when inhalation injury is suspected, before swelling makes it difficult. Hoarseness, a change in voice, drooling, difficulty swallowing and stridor are warning signs that the upper airway is narrowing and need immediate escalation.
First actions: airway and oxygen
Assess airway patency, voice, breathing effort and respiratory rate. Give 100% oxygen through a non-rebreather mask as ordered, sit the client upright if the spine is not a concern, and call for the airway team early so intubation equipment is ready. Keep reassessing, because a stable first look does not guarantee a stable airway.
Carbon monoxide poisoning is likely after smoke exposure in a closed space. A standard pulse oximeter cannot tell carboxyhaemoglobin from oxygenated haemoglobin, so it can show a normal reading in a poisoned client. Expect a blood sample for carboxyhaemoglobin by co-oximetry, and continue high-flow oxygen while results are pending.
What can wait, and what can be delegated
Estimating the burned body surface area, cleaning and dressing wounds, and tetanus status matter, but they come after the airway and breathing are secured. Fluid resuscitation for large burns is a circulation priority that runs alongside airway care rather than ahead of it.
Assistive staff can help gather equipment, keep the client warm and record vital signs. Airway assessment, oxygen delivery decisions and recognising deterioration remain with the registered nurse. Headache, nausea, confusion or reduced consciousness may reflect carbon monoxide effects and should be reported, not dismissed as anxiety.
Worked scenario: the tempting distractors
Hypothetical scenario: a client rescued from a house fire has singed nasal hairs, soot around the mouth and a hoarse voice. Pulse oximetry reads normal on room air. Options are: cool and cover the facial burns, start 100% oxygen by non-rebreather and alert the airway team, document that oxygenation is adequate, or calculate the burn size for fluids.
Starting 100% oxygen and alerting the airway team is the best answer. Cooling burns is good first aid, but the hoarse voice signals a threatened airway. The normal oximetry reading is misleading if carbon monoxide is present. Burn size calculation guides fluids, an important but later step in this situation.
Reassessment and the later picture
Reassess the airway at short intervals after arrival, listening for voice change, new stridor or increasing effort, and checking the mouth and throat for swelling and soot. Note the colour and amount of sputum, since carbonaceous sputum supports the suspicion of smoke reaching the lower airway. Hand over the exposure history clearly, including whether the client was trapped in an enclosed space.
Carbon monoxide can cause problems beyond the first hours. Severe poisoning, especially with reduced or lost consciousness, may lead the team to consider hyperbaric oxygen, and some clients develop memory, mood or movement problems days to weeks after exposure. Teach clients and families to report new confusion, personality change or difficulty concentrating after discharge, and document neurological findings on admission so that later changes can be recognised.
Sources and further reading
Burns, MSD Manual Professional Version. Signs suggesting inhalation injury including singed nasal hairs, carbonaceous sputum and perioral burns; early intubation; 100% oxygen for smoke and carbon monoxide exposure
Carbon Monoxide Poisoning, MSD Manual Professional Version. Pulse oximetry unable to detect carboxyhaemoglobin, co-oximetry for diagnosis, 100% oxygen by non-rebreather, symptoms such as headache and confusion
The next step on this is the same as on everything else here: answer questions and read the rationales. Our respiratory practice questions are the closest set to what this page covers.
Common questions
Why can pulse oximetry be normal in carbon monoxide poisoning?
Standard pulse oximeters cannot distinguish carboxyhaemoglobin from oxygenated haemoglobin, so the reading can look falsely reassuring. Carboxyhaemoglobin is measured with co-oximetry on a blood sample.
Why intubate early if the client is breathing on their own?
Airway swelling from heat injury can increase over the following hours. Securing the airway early, before swelling narrows it, is safer than attempting it later in an emergency.
Which signs suggest the upper airway is narrowing?
Hoarseness or voice change, stridor, drooling, difficulty swallowing and increasing work of breathing. Any of these after smoke exposure should be escalated immediately.