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(A) Airway

Does that Burn Casualty Need Intubation?

  • Posted byMike Shertz
  • Categories(A) Airway, More
  • Date September 28, 2020
  • Comments0 comment
A slide from the Burn section of CM online courses, including issues for inhalation, showing a photo of a burn victim on O2

Airway control remains the top priority for field treatment of burn casualties.1

a patient with substantial facial burns, swelling, enlarged lips and nose

Hypovolemic and distributive shock can occur in burned patients but they are usually a late consequence. An inhalational burn injury can double a casualty’s burn mortality.2

Upper airway thermal injury can result in substantial tissue edema, with resulting airway occlusion and hypoxia. Between 20 to 33% of patients admitted with smoke inhalational injury may present with acute upper airway obstruction.3

Suggestions of upper airway thermal injury include significant neck/facial burns, burns in the mouth, oropharyngeal soft-tissue edema, stridor, and abnormal voice. Soot in the mouth and singed nasal hairs may indicate potential airway involvement. Any burn in an enclosed space is concerning as well.

With progressive local inflammation, cell death, and increased capillary permeability, significant airway edema can occur after IV fluid resuscitation. This is often not predictable at the beginning of the resuscitation. Burns greater than 40% BSA will require substantial IV fluid administration with likely resultant edema, which can involve the airway. Some use this BSA cutoff as a marker for mandatory intubation.

A French study looked at the rate of difficult airways in patients with at least partial thickness or greater face/neck burns who were intubated prehospital (by EMS physicians) or at the burn center. Difficult airways were noted in 11.2% of their studied patients overall. They found intubation prehospital had a 3.5% difficult airway rate, compared to 16.9% of those intubated at the burn center. The patients had similar burn severity. The only difference was how soon after their burn they were intubated. The likelihood of a patient having a difficult airway tripled after two hours post-burn.4

 

One-quarter of the intubated patients in the French study were extubated in less than 24 hours suggesting they may not have required intubation.4 This study used data from 2007 to 2011. Since that time, there has been a sense in the burn community that the presence of facial burns alone is not a strong predictor of inhalational burn injury.5 

Twitter Portland rioter sets himself on fire
A Portland protestor sets himself on fire with his Molotov cocktail.

 It is challenging to integrate all of this information clinically. If we wait too long to intubate these patients, ie over two hours, the likelihood of a difficult airway triples. However, there is clear morbidity and potential mortality in intubating patients that ultimately don’t need it. That’s what continues to make this a challenging on the ground decision for pre-hospital providers.

As always, the need for airway control are imminent threat of airway obstruction, respiratory failure not responsive to other less invasive treatments, and altered mental status with a lack of airway protection.

References
1 Lin CH, Lin CH, et all, Challenges of Burn Mass Casualty Incidents in the Prehospital Setting: Lessons Learned from the Formosa Fun Coast Color Party, Prehosp Emer Care 2018;23:44-48

2 Sheppard NN, Hemington-Gorse S, Prognostic scoring system in burns: a review. Burns 2011;37:1288-95

3 Emergency Department Management of Smoke Inhalation Injury in Adults, Emergency Medicine practice, March 2018.

4 Esnault P, Prunet B, Tracheal intubation difficulties in the setting of face and neck burns: myth or reality? Am J Emerg Med 2014;32:1174-1178.

5 Kaneko T, Tanaka H, Predictors of Inhalational Burn Injury using Fire Site Information. Ann of Burn and Fire Disaster 2017; 30(4):275-277

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Mike Shertz

Dr. Mike Shertz is the Owner and Lead Instructor at Crisis Medicine. Dr. Shertz spent over 30 years gaining the experience and insight to create and provide his comprehensive, science-informed, training to better prepare everyday citizens, law enforcement, EMS, and the military to manage casualties and wounded in high-risk environments. Using a combination of current and historical events, Dr. Shertz’s lectures include relevant, illustrative photos, as well as hands-on demonstrations to demystify the how, why, when to use each emergency medical procedure you need to become a Force Multiplier for Good.

Previous post

What would you do in a burn MCI?
September 28, 2020

Next post

Recommended EMS fluid resuscitation of burned casualties
September 28, 2020

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