8.2 Surgical Fire Prevention (Fire Triad) & Airway/OR Fire Protocols

Surgical Fire Prevention (Fire Triad) & Airway/OR Fire Protocols

Surgical fires represent catastrophic, highly preventable sentinel events in the operating room. According to the ECRI Institute and the Association of periOperative Registered Nurses (AORN), approximately 90 to 100 surgical fires occur annually in the United States, frequently resulting in severe disfigurement, airway compromise, psychological trauma, or death. Perioperative registered nurses play a pivotal leadership role in identifying fire risks, enforcing preventative practices, and executing emergency protocols.

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The Surgical Fire Triad

A fire can only occur when all three components of the Surgical Fire Triad intersect in time and space:

                   [ IGNITION SOURCE ]
             (ESU, Lasers, Light Cords, Drills)
                         /       \
                        /         \
                       /   FIRE    \
                      /   TRIAD     \
                     /               \
    [ FUEL SOURCE ] ───────────────── [ OXIDIZER ]
(Prep, Drapes, Sponges, ETT)      (O2 >21%, N2O)

1. Ignition Sources (Heat / Energy)

Ignition sources are under the direct control of the surgical team:

• Electrosurgical Units (ESU): Monopolar cautery active electrodes (cautery pencils) are the primary ignition source in over 65% of surgical fires. Arcing, active electrode contact with drapes, or accidental foot-pedal activation can ignite surrounding materials.
• Surgical Lasers: $CO_2$, Nd:YAG, KTP, and Holmium lasers generate extreme focal thermal energy capable of igniting drapes, sponges, and endotracheal tubes.
• Fiberoptic Light Cables: Unattached high-intensity light cables (xenon or LED) convert light to intense thermal energy at the cable tip, capable of igniting drapes within seconds.
• Powered Surgical Instruments: High-speed burs, drills, and electrocautery bipolar forceps generate friction heat.

2. Fuel Sources (Combustible Material)

• Alcohol-Based Antiseptics: Chlorhexidine gluconate in 70% isopropyl alcohol (CHG/IPA) or povidone-iodine in 70% alcohol are highly volatile. Liquid pooling or unevaporated vapors under drapes are major fire hazards.
• Surgical Drapes & Textiles: Paper/plastic drapes, surgical towels, laparotomy sponges, raytec gauze, stockinettes, and gown material.
• Airway & Patient Components: Endotracheal tubes (polyvinyl chloride - PVC, silicone, rubber), nasal cannulas, oxygen masks, petroleum-based lubricants, intestinal methane gas, hair, and skin.

3. Oxidizers (Enriched Atmosphere)

• Oxygen ($O_2$): Room air contains 21% $O_2$. In oxygen-enriched atmospheres ($>21%\ O_2$), materials ignite at lower temperatures and burn with extreme velocity.
• Nitrous Oxide ($N_2O$): Supports combustion identically to oxygen.

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Preoperative Fire Risk Assessment

AORN and the American Society of Anesthesiologists (ASA) mandate performing a formal Fire Risk Assessment during the preoperative time-out. The standard 3-point risk scoring tool assesses:

1. Surgical Site: Is the procedure performed above the xiphoid process (head, neck, face, chest)?
2. Open Oxygen Delivery: Is an open oxygen delivery system being used (nasal cannula, simple mask) rather than a closed airway (cuffed ETT, LMA)?
3. Ignition Source: Is an ignition source (ESU active electrode, laser, electrocautery) present or planned?

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Fire Prevention Best Practices

Alcohol Antiseptic Management

• Mandatory Dry Time: Alcohol-based skin preps require a minimum drying time of 3 full minutes on bare skin, and up to 1 hour in unshaved or hairy areas. Draping must never begin until prep is completely dry.
• Pooling Prevention: Eliminate liquid pooling in skin folds, umbilicus, neck, or hair. Remove prep-soaked towels or chux from under the patient before draping.

Ignition Device Safety

• Insulated Safety Holster: Monopolar ESU active electrodes must be kept in a rigid, non-conductive, insulated safety holster whenever not in active use. Never rest ESU pencils directly on patient drapes or skin.
• Laser Standby: Lasers must remain in STANDBY mode at all times until the surgeon is positioned and ready to fire.
• Light Source Control: Fiberoptic light cables must be attached to the scope or placed in STANDBY mode before turning on the light generator. Never place an active cable on drapes.

Oxidizer Management

• FiO2 Titration: For open oxygen delivery during head/neck cases under MAC, titrate $FiO_2$ to the lowest clinically safe level (preferably $<30%$).
• Airway Conversion: If the patient requires $>30%\ O_2$, convert open delivery to a closed airway (cuffed ETT or LMA) before using ESU or lasers.
• Drape Scavenging: Use medical air blowers under drapes to purge accumulated oxygen, or arrange drapes to allow open ventilation to the atmosphere.

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Emergency Fire Protocols

When a surgical fire occurs, instant, coordinated action is required. Protocols differ between airway fires and non-airway fires.

Airway Fire Protocol (Endotracheal Tube Fire)

An airway fire inside an endotracheal tube acts as a blowtorch, delivering thermal and toxic chemical trauma to the tracheobronchial tree. Execute these steps immediately:

[1. Discontinue Gas Flow & Disconnect Circuit] ➔ [2. Immediately Extubate Burning ETT]
                                                                 │
[4. Re-establish Airway & Bronchoscopy] ◄── [3. Instill Sterile Water into Airway]

1. Interrupt Gas Flow & Disconnect Circuit: Immediately disconnect the breathing circuit from the ETT to stop oxygen flow. Do not wait to turn off the anesthesia machine valves.
2. Extubate the Burning Tube: Remove the burning ETT immediately and drop it on the floor/saline basin. Save the tube for investigation.
3. Extinguish Remaining Embers: Instill sterile water or normal saline directly into the airway and pharynx to quench residual fire and cool tissues.
4. Re-establish Airway & Evaluate: Re-intubate the patient with a fresh, clean ETT. Ventilate with 100% $O_2$ (only after fire is completely out). Perform rigid or flexible bronchoscopy to inspect airway tissue damage, remove soot, and retrieve charred tube debris.

Non-Airway / Surgical Field Fire Protocol

For fires occurring on patient skin, drapes, or surgical equipment:

1. Stop Ignition & Gas Flow: Immediately halt ESU/laser use and turn off oxygen and nitrous oxide delivery to the field.
2. Extinguish Flames: Smother burning drapes using wet surgical towels or pour sterile saline/water directly onto the flames. Do not use dry towels, as they feed the fire.
3. Remove Burning Drapes: Remove all smoldering and burned drapes from the patient and douse them on the floor.
4. Assess & Care for Patient: Inspect patient for thermal burns, maintain airway and ventilation, assess wound contamination, and provide immediate burn treatment.
5. Evacuate / Extinguisher Use: If the fire is uncontained, activate the fire alarm, use a water-mist or clean-agent fire extinguisher rated for OR use (NFPA 99), or a $CO_2$ extinguisher when appropriate (avoid dry-chemical extinguishers in open surgical wounds), and follow RACE (Rescue, Alarm, Confine, Extinguish/Evacuate).

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Environmental Hazards Beyond Fire: Disasters and Security Events

Domain 6 also requires safeguarding patients and staff during broader environmental emergencies—toxic fumes/smoke events, natural disasters, terrorism, and active-shooter/mass-casualty situations.

Perioperative priorities:

• Know facility emergency codes, evacuation routes, and OR-specific shelter-in-place vs. evacuate criteria.
• For toxic smoke/fumes: protect airway, shut down ignition/energy sources when safe, evacuate per RACE, and avoid re-entry without clearance.
• For active shooter: follow institutional Run-Hide-Fight (or equivalent) guidance; do not attempt to continue elective surgery; secure doors when hiding; communicate with emergency services when safe.
• For mass casualty: prepare to receive surge cases, conserve blood products/supplies, and use disaster privilege/role assignments defined by the hospital emergency operations plan.
• After any event, participate in debriefing and documentation required for regulatory and quality review.

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Key Exam Traps & Clinical Pitfalls

⚠️ Exam Trap: In an airway fire, never pour water into the ETT before extubating—disconnect gas and extubate the burning tube first!

⚠️ Exam Trap: Never use dry surgical drapes or dry towels to smother an OR fire; only use wet towels or sterile saline solution.

⚠️ Exam Trap: Failing to allow the full mandatory 3-minute dry time for alcohol skin preps is one of the most common causes of surgical fire litigation.