Is Santyl (collagenase) ointment flammable when applied near a tracheostomy wound in a patient receiving supplemental oxygen?

Santyl Ointment Is NOT Flammable, But Its Petrolatum Base Can Serve as Fuel in the Presence of Oxygen and an Ignition Source

While Santyl (collagenase) ointment itself is not inherently flammable, its white petrolatum base can act as fuel in the fire triad when combined with supplemental oxygen and an ignition source near a tracheostomy site, creating a significant fire risk.

Understanding the Fire Risk

The ASA guidelines clearly define the "fire triad" requiring three components: (1) an oxidizer (oxygen or nitrous oxide), (2) an ignition source (electrocautery, lasers, heated probes), and (3) fuel 1. Ointments are explicitly listed as fuel sources in operating room fire prevention guidelines 1.

Key Risk Factors at Tracheostomy Sites

• Oxidizer-enriched atmosphere: Any oxygen concentration above room air (21%) creates an oxidizer-enriched environment 1. Patients on supplemental oxygen via tracheostomy are continuously exposed to elevated oxygen concentrations.

• Open oxygen delivery: Tracheostomy sites represent an open system where oxygen can accumulate in surrounding tissues and under dressings, particularly problematic as "when administered in an open system, supplemental oxygen creates a high-risk situation" 1.

• Petrolatum as fuel: Santyl contains white petrolatum USP as its base 2, which serves as the fuel component of the fire triad.

Clinical Recommendations

Safe Application Protocol

1. Minimize oxygen exposure during application:

   • If clinically tolerable, temporarily reduce FiO₂ to the minimum required to avoid hypoxia during dressing changes 1
   • Wait 1-3 minutes after reducing oxygen before any potential ignition source is nearby 1

2. Ensure complete separation from ignition sources:

   • Never apply Santyl when electrocautery, lasers, or other heat-generating devices are in use nearby 1, 3
   • Avoid application immediately before or during procedures involving ignition sources

3. Proper dressing configuration:

   • Configure dressings to prevent oxygen accumulation and trapping under materials 1
   • Ensure adequate ventilation around the tracheostomy site
   • Avoid creating enclosed spaces where oxygen can pool

4. Standard application per FDA labeling:

   • Apply to wound or sterile gauze pad as directed 2
   • Secure dressings properly to minimize oxygen pooling

Critical Pitfalls to Avoid

• Never combine Santyl application with simultaneous use of electrocautery or other ignition sources near the tracheostomy
• Do not assume that because Santyl is a medical product it cannot contribute to fire risk—the petrolatum base is combustible in oxygen-enriched environments
• Avoid alcohol-based skin preparations in the same area, as these create additional volatile fuel sources 1, 4

When Fire Risk Is Highest

Tracheostomy procedures themselves are classified as high-risk procedures because ignition sources (electrocautery for hemostasis) come into proximity with oxidizer-enriched atmospheres 1, 5, 6. The combination of:

• Open oxygen delivery system
• Ointment-based fuel source
• Potential for electrocautery use during tracheostomy care or revision

creates the complete fire triad.

Practical Safety Measures

For routine tracheostomy care with Santyl application:

• Perform dressing changes away from any electrical equipment
• Ensure oxygen delivery is optimized (lowest safe FiO₂)
• Use moisture-retentive secondary dressings that don't trap oxygen
• Educate all caregivers about fire risk with oxygen and petroleum-based products

The bottom line: While Santyl can be used safely near tracheostomy sites in oxygen-dependent patients, meticulous attention to separating the fire triad components is essential—never allow the simultaneous presence of supplemental oxygen, petroleum-based ointment, and ignition sources in the same location 1, 3.