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Airway management, intubation, and tracheostomy in burn patients

Moderate65 refs · 26 min read

Summary

Summary — bedside~15 sec read
  • What it is: Staged control of the burn airway, from the decision to intubate through difficult-airway technique, extubation, and tracheostomy [1, 2].
  • When performed: For objective airway compromise, anticipated upper-airway edema, inhalation injury, or prolonged ventilatory support after major burn [3, 4].
  • Key steps: Intubate by objective criteria, secure the difficult airway awake when contracture distorts anatomy, and time extubation and tracheostomy individually [4, 5, 7].
  • Watch for: Over-intubation is the dominant error; roughly a third of patients intubated before burn-center arrival are extubated within 48 hours [4, 6].
Key Points
  • Recognize: Facial-burn pattern alone is a poor predictor of airway injury and the need for a tube; physical examination and direct inspection outperform reflexive intubation [8, 9]. → Indications for Intubation
  • Immediate action: Objective criteria such as the ABA and Denver criteria increase sensitivity for prolonged intubation, and authors propose reserving intubation for patients who meet them [10, 11]. → Indications for Intubation
  • Immediate action: Post-burn contracture of the face and neck distorts airway anatomy; authors of these reports favor securing the airway awake with a fiberoptic or video-laryngoscopic technique [12, 13]. → Difficult Airway and Intubation Technique
  • Watch for: Sequelae are more frequent and more severe after tracheostomy than after translaryngeal intubation, and tube duration plus the tracheal stoma are the dominant etiologic factors [3]. → Airway Complications
  • Watch for: Dysphagia affects roughly half of older burn patients and is tied to intubation duration, ventilation, and prolonged enteral feeding [14, 15]. → Dysphagia and Voice
  • Unresolved: Tracheostomy timing is unsettled; multi-database analysis links early tracheostomy to shorter stay and fewer ventilator days, while a nationwide study found no 28-day mortality difference [7, 16]. → Controversies and Evidence Gaps
  • Special populations: Children are intubated before burn-center arrival less often than adults, yet roughly a third of those tubes are also removed within 2 days [17]. → Special Considerations

Airway management, intubation, and tracheostomy in burn patients

Overview

Upper airway management is central to burn care, and establishing a secure airway is a critical task in the acute phase of facial and inhalation injury [1, 18]. Airway management is a load-bearing consideration in every burn resuscitation because the airway can be normal on arrival and obstructed hours later as edema develops, and because the same maneuvers that secure the airway can themselves injure it [19]. The clinical problem divides into four sequential decisions: whether to intubate, how to secure a technically difficult airway, when to extubate, and whether and when to perform tracheostomy.

The dominant theme across the modern literature is that burns are over-intubated. Many burn patients undergo unnecessary intubation driven by concern for inhalation injury, and the classic clinical examination findings that prompt those tubes correlate poorly with actual airway injury [20, 21]. The countervailing risk is real: thermal airway injury usually accompanies facial burns and can demand emergency control, and laryngeal edema can progress to obstruction [22]. The field has therefore moved toward objective criteria, direct laryngoscopic or bronchoscopic inspection, and early otolaryngology involvement, both to avoid placing tubes that are not needed and to limit the laryngotracheal damage caused by the tubes that are.

Indications for Intubation

When and whom to intubate is the most contested bedside decision in burn airway care. Multiple cohorts document a high rate of short-lived tubes: across adult burn intensive care units, more than 30 percent of patients arriving intubated are extubated within 2 days, a pattern labeled potentially unnecessary intubation [17]. In a 5-year regional burns-centre series, 30.8 percent of intubated patients were extubated within 48 hours, and intubation-related complications occurred in 37.5 percent of patients, with ventilator-associated pneumonia the most common at 27.5 percent [11]. Systematic review of pre-burn-center intubation found that these patients were more likely to have earlier extubation times, again pointing to potentially unnecessary intubation [6].

Facial burns are a weak trigger on their own. In a cohort of 335 facial-burn patients, 121 were intubated in the emergency department but only 73 (60.3 percent) were later confirmed to have inhalation injury on bronchoscopy, and conventional physical signs such as hoarseness and singed nostril hair were not predictive of inhalation injury or the need for a tube [9]. The authors of that series note that all patients with TBSA over 60 percent were intubated regardless of airway findings [9]. Predictors that do associate with inhalation injury before burn-center arrival include increasing percent TBSA burned, flame mechanism, enclosed-space exposure, face burns, hoarse voice, soot in the mouth, and shortness of breath [8].

Objective criteria are the response to over-intubation. Badulak and colleagues defined traditional criteria (suspected smoke inhalation, oropharyngeal soot, hoarseness, dysphagia, singed facial hair, oral edema, oral burn, non-full-thickness facial burns) and the ABA criteria, then found long-term intubation was strongly associated with ABA criteria (77.5 percent) over traditional criteria (22.5 percent) [10]. Adding suspected smoke inhalation and singed facial hair to the ABA criteria created the Denver criteria, which raised sensitivity for long-term intubation to 95 percent while specificity fell to 24 percent [10]. The authors state that intubation should be considered for patients displaying the Denver criteria, that the criteria include full-thickness facial burns, stridor, respiratory distress, swelling on laryngoscopy, upper-airway trauma, altered mentation, hypoxia or hypercarbia, hemodynamic instability, suspected smoke inhalation, and singed facial hair, and that patients lacking these criteria should not be intubated [10]. In an independent series, 72.5 percent of intubated patients met ABA criteria and 95 percent met Denver criteria, yet 30.8 percent were extubated within 48 hours, and the authors conclude that current criteria may overestimate the risk of airway compromise [11].

Liberal and restrictive criteria trade sensitivity against specificity. Comparing the two in adults with suspected inhalation injury, liberal criteria had higher sensitivity for prolonged intubation (0.98 vs 0.84) but markedly lower specificity (0.48 vs 0.96), and among patients who met liberal but not restrictive criteria, 65 percent were extubated within 48 hours and 90 percent did not have inhalation injury [4]. Adding objective gas-exchange data helps: arterial pH below 7.30 had 80 percent sensitivity and specificity for appropriate intubation, and adding pH and the P/F ratio to the ABA criteria improved sensitivity for appropriate intubations from 0.86 to 0.97 without altering specificity [23]. Provider background matters less than the criteria used; surgeons with acute-care-surgery training showed no difference from burn providers in emergent intubation rates, time to extubation, or bronchoscopic diagnosis of inhalation injury [20]. Prolonged mechanical ventilation, the downstream consequence of intubation, is independently associated with TBSA, age, full-thickness facial burn, and shock [24].

Upper Airway and Laryngeal Injury

The larynx bears the brunt of upper-airway thermal injury and is the structure whose edema most often forces airway control. Laryngeal inhalation injury carries a significant increase in mortality and often indicates immediate airway evaluation, and laryngeal injuries form a distinct subset with minor-to-severe laryngotracheal delayed sequelae, particularly after thermal injury in enclosed spaces [19]. Laryngeal pathology after inhalation injury includes edema and erythema, laryngeal granulation, vocal-cord palsy or paresis, and laryngeal contracture [25]. The three major injury classes described for the burned airway are supraglottic, subglottic, and systemic [26]. In an animal laryngeal-burn model, granulation tissue appeared at 3 days and early epiglottic and subglottic fibrosis appeared by 7 days and matured by 14 days, with massive supraglottic edema concentrated around the arytenoids extending transglottically [27].

Whether the airway is evaluated before or after intubation shapes what is found and what follows. In a systematic review of laryngeal inhalational injuries, airway stenosis was more common in patients intubated immediately than in those evaluated first (50.0 percent vs 5.2 percent), posterior glottic involvement was identified only in patients intubated before airway evaluation, and every case in which intervention preceded laryngeal evaluation occurred in a closed-space setting [19]. The review authors note that early otolaryngology referral may mitigate or treat these effects [19]. Long-term laryngotracheal complications after inhalation injury are under-recognized, and described risk factors include high-grade injury, elevated initial inflammatory responses, prolonged translaryngeal intubation, and a history of tracheostomy [5]. Early surgical management of thermal airway injury has been reported to produce rapid abatement of mucosal inflammation, resolution of granulation tissue, and return of laryngeal function [28].

Difficult Airway and Intubation Technique

Fiberoptic bronchoscopy is the reference tool both for diagnosing inhalation injury and for guiding intubation, established as a simple, safe, and accurate method that identifies the anatomic level and severity of large-airway injury [29]. Beyond diagnosis, direct inspection prevents tubes: in one series, all 51 patients who underwent flexible fiberoptic laryngoscopy met traditional intubation criteria on examination, yet 98 percent were safely monitored without intubation based on the scope findings [21]. Nasolaryngoscopy carries the same message in asymptomatic patients; none of 130 asymptomatic patients with negative nasolaryngoscopy were intubated, and the presence of erythema or edema in asymptomatic patients was of questionable clinical significance [9, 30]. Pediatric fiberoptic laryngoscopy in referred facial-burn children had a sensitivity of only 29 percent for clinical findings, comparable to reliance on clinical examination alone [31]. Direct visual inspection via nasolaryngoscopy can guide appropriate airway-management decisions [32].

When intubation is required, post-burn contracture of the face and neck creates an anticipated difficult airway that distorts the standard approach. Reported features include restricted mouth opening, fixed neck flexion, microstomia, scar hyperplasia, and tracheal stenosis, and both anesthesiologists and surgeons report difficulty in this setting [33]. The recurring recommendation across these reports is to secure the airway with the patient awake: authors describe awake fiberoptic-guided intubation, intubating laryngeal mask airway, and intubation without neuromuscular blockade as the safe approaches in moderate-to-severe post-burn contracture necks [12, 13]. Awake flexible fiberoptic intubation is described as the reference for anticipated difficult tracheal intubation, though serious facial burns and dysmorphic anatomy can make it difficult or impossible, and video-laryngoscopic devices such as the Pentax Airway Scope and King Vision have been used as alternatives [34, 35]. In severe glottic narrowing, oxygenation delivered through the working channel of the fiberscope during awake tracheal intubation has been used to prolong safe apnea time [36]. Fixation of the endotracheal tube on burned facial skin is itself a challenge; reports describe intermaxillary fixation screws, trans-alveolar wiring, and dental-unit fixation techniques to secure the tube without further tissue damage [18, 37].

Extubation

Extubation timing and failure are distinct problems from intubation, because the burned airway can fail liberation for reasons the standard indices miss. There is no consensus on an acceptable extubation-failure rate, and conventional indices do not accurately predict extubation outcomes in burn patients; in one analysis the extubation-failure incidence was 12.3 percent, and a sodium trending higher before extubation was associated with more successes, possibly reflecting lower volume status [38]. Higher heart rate and lower serum pH were associated with extubation failure, while the presence of inhalation injury was associated with extubation success in that matched analysis [38].

Unplanned extubation is the inverse hazard. In a burn-unit review, unplanned extubation occurred in 4.7 percent of patients (0.7 events per 100 ventilator days), inhalation injury was independently associated with increased risk (odds ratio 4.68), and no patient with a bite block had an unplanned extubation [39]. Accidental loss of the tube can be fatal because reintubation is technically hard in the edematous or contracted burn airway; in one tracheal-reconstruction series, six of the eight accidentally extubated patients in the conventionally treated group died from reintubation difficulties [65]. Distinct from these is palliative extubation, the deliberate termination of mechanical ventilation to allow a natural death when ventilator support no longer aligns with the patient's goals [40].

Tracheostomy

Tracheostomy is the most common and effective strategy for maintaining airway patency in burn patients who need prolonged control, and it is indicated when prolonged mechanical ventilation is anticipated [16, 41]. Indications and timing have historically been experience-driven and sometimes controversial, and severe burn patients often need prolonged ventilation because of their critical condition, sedation management, and repeated operating-room visits [41, 42]. Predictive tools have been developed to formalize the decision: a nomogram predicts the need for tracheostomy in burned patients, and a classification formula combining clinical factors reached an AUC of 0.972, with hours after injury the only indicator for emergency tracheotomy (cut-off 32.4 hours) [41, 43].

The historical comparison of tracheostomy with translaryngeal intubation favors leaving the tube where possible. In the Lund series, sequelae were more frequent and more severe after tracheostomy than after translaryngeal intubation, duration of tube placement and the presence of a tracheal stoma were the dominant etiologic factors, and the authors favored translaryngeal (nasotracheal) tubes for initial respiratory support for periods up to 3 weeks [3]. More recent matched data temper that concern: in one cohort, complications occurred equally in tracheotomized burn patients and matched controls, and tracheostomy was linked neither to dysphagia nor to inpatient mortality, with the authors concluding it is safe [43].

Technique selection centers on percutaneous versus open approaches. Percutaneous techniques are associated with a lower risk of infection than surgical tracheostomy, and in burned patients with inhalation injury the bedside percutaneous approach has been reported with no significant perioperative complications, one-fifth the cost of conventional tracheostomy, and a lower incidence of pulmonary sepsis (45 percent vs 68 percent) [44, 45]. One series found no difference in complications between percutaneous dilational and open surgical tracheostomy and supported early tracheostomy to reduce dysphagia in patients without neck burns [46]. A semi-open modification has been described to combine the minimally invasive percutaneous advantages with the surgical control of the open technique, and ultrasound-guided percutaneous dilational tracheostomy has been used to open the airway quickly in head-and-neck burns with upper-airway obstruction [47, 48]. In a patient who arrested from complex upper-airway obstruction after burns and repeated intubation attempts, emergency Griggs percutaneous tracheostomy was life-saving [49].

Airway Complications

The tubes and stomas that secure the burned airway produce a characteristic set of late complications. After intubation or tracheostomy, four patients in the Lund series developed tracheal stenosis and five had significant tracheal scar-granuloma formation [3]. In moderate and severe inhalation injury followed long-term, the tracheostenosis rate reached 100 percent, with granuloma formation and vocal-cord paralysis more frequent in severe injury [50]. Complex post-tracheostomy tracheal stenosis with cartilage destruction and tracheomalacia is a severe complication described in burn patients, and post-corrosive and post-tracheostomy tracheal stenosis can produce life-threatening but potentially reversible airway obstruction at the bedside [51, 52]. Reconstruction can be difficult; a full-length laryngotracheal stenosis required multiple costal-cartilage graft reconstruction after laser dilatation and resection failed [53].

Tracheocutaneous fistula is a common complication after decannulation of a long-term tracheostomy, with incidence correlating with cannulation duration, and persistent fistulas have been closed with multilayered local-tissue rearrangement [54]. Acquired tracheoesophageal fistula is uncommon but can occur as a delayed, life-threatening complication of inhalation injury; in one report a massive tracheoesophageal fistula developed on postburn day 14 and caused refractory respiratory failure managed with venovenous extracorporeal membrane oxygenation to permit surgical repair [55]. Pathologic study of severe laryngeal burns shows epidermal necrosis, gland and chondrocyte necrosis, vascular congestion, and granulation with cartilaginous metaplasia, changes implicated as the substrate of laryngostenosis [27, 56]. For refractory hypoxemic respiratory failure that the airway alone cannot rescue, extracorporeal membrane oxygenation is described as salvage therapy, though roughly half of burn centers use it, patient volumes are very low, and overall mortality has remained unchanged across decades despite increasing venovenous use [57, 58].

Dysphagia and Voice

Swallowing impairment is a frequent and under-appreciated consequence of the burned airway, driven by intubation, ventilation, and facial wounds. Dysphagia is identified in roughly half of older burn patients during admission, and one in every two patients aged 75 or older admitted with burn injury demonstrates dysphagia [14, 15]. Dysphagia is associated with burn size, pre-existing cognitive impairment, mechanical ventilation, duration of enteral feeding, hospital length of stay, in-hospital complications, and mortality, while burn location and mechanism are not associated [15]. Cognitive impairment is the most sensitive predictor at 100 percent sensitivity [14]. Intubation duration is a recurring driver: in one cohort all dysphagia patients had an orotracheal-intubation history averaging 18 days, versus 8.5 days in the non-dysphagia group [59]. Severity is graded across a mild-to-severe spectrum, with one series reporting 52 percent mild, 20 percent moderate, and 28 percent severe oropharyngeal dysphagia after thermal burn [60].

Voice and the wider goals of airway recovery follow the same pathway. Dysphonia is a frequent late complication of inhalation injury, severe inhalation injury is associated with dysphonia and with poor dysphonia resolution at six months, and dysphonia severity tracks intubation duration [25]. The stated goals of laryngotracheal management after inhalation injury are to restore airway patency, preserve voice quality, and restore normal diet and swallow function [5].

Special Considerations

Pediatric patients

Children follow the adult pattern of over-intubation but reach the burn center intubated less often. Among 1520 admitted children, only 4 percent arrived intubated, intubation before admission was less frequent than in adults, and yet roughly a third of intubated children were extubated within 2 days, close to the adult potentially-unnecessary-intubation rate [17]. Pediatric airway management in facial and neck burn contracture rests on detailed planning and patient preparation, and awake airway management with airway anesthesia can be used safely in selected children [12]. Laryngotracheal stenosis in the pediatric burn patient is complex and multidisciplinary, with laryngotracheal reconstruction the mainstay; cricoid split has a role in carefully selected older children with acute subglottic injury, and a staged reconstruction with rescue-tracheostomy safety has been advocated given pro-inflammatory burn physiology [61, 62]. Tracheocutaneous fistula formation correlates with cannulation duration in children, and pediatric burn patients with tracheostomy showed worse morbidity and higher health burden than those without [54, 63].

Caustic and atypical airway injury

The burned airway also presents through non-thermal mechanisms. Caustic-agent injury can produce severe glottic edema requiring urgent control, and post-corrosive tracheal stenosis can cause delayed, life-threatening airway obstruction even with a tracheostomy in place [36, 51]. Pediatric subglottic stenosis after chemical or thermal injury has been managed with cricoid split and laryngotracheal reconstruction [62]. These mechanisms share the burned-airway principles of difficult instrumentation and delayed sequelae, while their diagnostic workup overlaps with caustic-ingestion pathways outside this topic's scope.

Pre-existing pulmonary disease

COPD does not independently worsen short-term outcomes after fire-related inhalation injury in one 184-patient analysis, with no difference in hospital days, ventilator days, complication rates, or mortality, although carbon-monoxide poisoning was the predominant mortality risk factor in that cohort [64].

Controversies and Evidence Gaps

Burn airway management carries several active controversies with direct bedside consequences.

The intubation threshold is the central unresolved question. The literature consistently documents over-intubation, with roughly a third of pre-burn-center and intubated-on-arrival patients extubated within 48 hours, and authors of multiple cohorts argue that objective criteria, gas-exchange data, and direct inspection should replace reflexive intubation on facial-burn pattern [4, 6, 11, 17]. Providers are urged to use objective tools such as the ABA and Denver criteria to avoid unnecessary tubes, yet the same criteria are sensitive at the cost of specificity, so the optimal operating point is not settled [6, 10].

Tracheostomy timing is unsettled. A multi-database analysis associated early tracheostomy with shorter length of stay and fewer ventilator days, and its authors support early tracheostomy in critically injured burn patients needing prolonged ventilation [16]; a separate burn-ICU cohort additionally linked early tracheostomy to earlier active exercise [42]. A nationwide observational study, by contrast, found no significant association between early tracheostomy and 28-day in-hospital mortality after adjustment, and concluded the appropriate timing and its effect on mortality remain unknown [7]. An evidence-based guideline review concluded that early tracheostomy seems to reduce ventilator duration but not pneumonia incidence, length of stay, or long-term mortality [44]. The pediatric data add caution, with one cohort showing worse morbidity and health burden in children who received tracheostomy and its authors urging the potential benefits be weighed against these outcomes [63].

The translaryngeal-versus-tracheostomy tradeoff is not fully reconciled across eras. The historical series found tracheostomy sequelae more frequent and severe than after translaryngeal intubation, while a contemporary matched analysis found tracheostomy safe and not linked to dysphagia or mortality, leaving the relative late-complication burden dependent on tube duration, stoma presence, and modern technique rather than a fixed rule [3, 43]. Across these questions, much of the supporting evidence is retrospective single-center or case-series work, and predictive tools such as tracheostomy nomograms and intubation-criteria formulas await external validation before they can standardize practice [41, 43].

References

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