Pediatric inhalation injury

Overview

Inhalation injury is the single finding that most reliably turns a survivable burn into a critical illness in a child. Smoke inhalation injury is associated with significant morbidity and mortality in burn patients ^[1], and inhalation injury remains a predictor of morbidity and mortality across burn injury generally ^[2]. In burned children the pulmonary problem has become the limiting one: pulmonary failure has emerged as one of the leading causes of mortality in burned children, in part because success in reducing sepsis, in early surgery and fluid resuscitation, and in nutritional support has removed competing causes of death ^[6]. The older framing still holds at the bedside: inhalation injury has emerged as the number one cause of fatality in the burn patient ^[3].

The injury is not one disease but a set of overlapping insults. Inhalation injury results from direct thermal injury or chemical irritation of the respiratory tract, systemic toxicity from inhaled substances, or a combination of these factors ^[4]. The major early pathophysiologic changes in the lungs of burned patients relate to upper-airway obstruction and lower-airway permeability edema ^[3], and patients with inhalation injury typically progress through three stages of acute pulmonary insufficiency, pulmonary edema, and bronchopneumonia ^[3]. The clinical task is to protect the airway before it closes, support the lung through the permeability phase, treat the toxic gases the child inhaled, and anticipate the pneumonia and stenosis that follow.

This page treats the child specifically. Smoke inhalation injury is common among victims of domestic fires, and children are among the most vulnerable ^[16]. Vulnerable populations including infants and children experience disproportionate respiratory risk from smoke exposure ^[5]. The durable principles are clinical recognition, airway protection, lung-protective support, and treatment of carbon monoxide and cyanide; the evidence for most specific adjuncts is thin, and the page surfaces where it is thinnest.

Epidemiology

Burned children are a young, scald-heavy population in whom inhalation injury concentrates the mortality. Of patients hospitalized with burns, 30 to 40 percent are under 15 years of age, with flame burns accounting for approximately 13 percent of accidents, scalds for 85 percent, and electrical and chemical burns for approximately 2 percent ^[7]. Across a meta-analysis of Chinese burn epidemiology, incidence rates were higher for the 0 to 4 year and 30 to 45 year age groups, and young children 0 to 4 years constituted a special risk group ^[8]. The overall pediatric mortality is low in modern series: mortality rates for pediatric burn patients were 0.62 percent in the National Burn Repository and 0.52 percent in TriNetX, with boys having a higher incidence of mortality than girls in both databases ^[45].

Against that low baseline, inhalation injury is the dominant adverse modifier. Injury to the airways after smoke inhalation is a major mortality risk factor in burn victims, producing a 15 to 45 percent increase in patient deaths ^[9]. In the meta-analysis, inhalation injury carried an odds ratio for mortality of 6.67 (95% CI 3.03 to 11.31), against an overall pooled mortality of 3 percent ^[8]. Where children die of fire, the airway and its toxic gases are central: in a pediatric fire-death series, 35 percent died from incineration and 33 percent from respiratory burns with smoke or carbon monoxide inhalation ^[10].

The need for airway support is measurable and not rare. In one pediatric burn population, 100 of 1,092 admitted patients (9.2 percent) required airway support, defined as endotracheal intubation or tracheostomy, for more than 24 hours ^[12]. Carbon monoxide exposure is common in child fire victims: in a Southern Israel pediatric series, 95 children had carboxyhemoglobin levels above 5 percent, with children exposed to gas older than those exposed to smoke or to heating-related incidents ^[11]. The setting matters because enclosed-space and motor-vehicle fires generate the highest toxic-gas burden, a point the toxicology literature returns to repeatedly ^[15].

Pathophysiology

Inhalation injury injures the respiratory tract by three mechanisms that frequently coexist: direct thermal injury, chemical irritation, and systemic toxicity from inhaled substances ^[4]. Thermal energy and particulate-bound chemicals injure the airway epithelium; the major early consequences are upper-airway obstruction from edema and lower-airway permeability edema ^[3]. Autopsy work in burned children shows that airway epithelial loss is a real injury rather than a fixation artifact, and that the degree of epithelial compromise correlates most strongly with age and degree of burn ^[13]. The histologic severity tracks the clinical grading: among inhalation-injured patients graded by epithelial damage, injury ranged from slight hyperemia and edema in first-degree injury to necrosis and exfoliation in third-degree injury ^[19].

The parenchymal end of the spectrum is acute respiratory distress syndrome. Protein-rich alveolar edema, the abnormality that leads to ARDS, can arise from multiple causes including inhalation injury ^[14]. In autopsies of burned pediatric patients, histologic findings of diffuse alveolar damage, the pathological correlate of ARDS, were seen in approximately 42 percent of cases ^[14]. Notably, the relationship between an inhalation-injury score and ARDS is not deterministic; one prospective study found no association between inhalation injury assessed by an inhalation lung injury score and the development of ARDS ^[52]. The lower airway also becomes a microbiological and metabolic battleground: the airway microbiota after burn and inhalation injury is altered in patients with a PaO2/FiO2 ratio at or below 300 early after injury ^[9], and systemic hyperglycemia raising the airway and blood glucose threshold over 150 mg/dL has been linked mechanistically to overgrowth of bacteria in the bronchopulmonary system and an increased pneumonia risk ^[18].

Systemic toxicity is the part of the injury that the lung exam misses. Carbon monoxide is the predominant lethal toxin: in a smoke-inhalation death series, carboxyhemoglobin concentrations ranged from 37 to 93 percent with a mean of 76.5 percent and corresponded well with death from smoke inhalation ^[17]. Cyanide is a co-toxin from combustion of nitrogen-containing materials; cyanide concentrations are highest after enclosed-space fires and motor-vehicle fires ^[15], and cyanide poisoning may occur in addition to carbon monoxide poisoning and is challenging to diagnose ^[16].

Classification

Inhalation injury is classified anatomically by the level of the respiratory tract involved and by the severity of airway-mucosal damage. The Moylan classification stratifies injuries into upper-airway, major-airway, and parenchymal patterns; in one pediatric series of 97 children it identified 59 with upper-airway burns, 29 with major-airway burns, and 44 with parenchymal burns ^[21]. A bronchoscopic severity scheme grades epithelial injury into three categories from first-degree hyperemia and edema through third-degree necrosis and exfoliation; among 60 graded patients, 27 percent had first-degree, 55 percent had second-degree, and 18 percent had third-degree injury ^[19]. A flexible-bronchoscopy classification into grades G1 and G2 separates milder from more severe airway injury, with the more severe grade predicting a prolonged recovery course ^[20].

These grading systems exist because the diagnostic criteria themselves are not standardized. Bronchoscopic criteria for post-thermal pulmonary injury include airway edema and inflammation, mucosal necrosis, and the presence of soot and charring in the airways ^[23]. Earlier composite scores combined history, physical examination, bronchoscopic findings, and xenon lung scanning into an inhalation injury scoring system that correlated with post-injury changes in compliance and subsequent sequelae ^[22]. The historical Stone description of pediatric inhalation injury already recognized a staged clinical course of bronchospasm in the first hours, pulmonary edema over the first three days, and bronchopneumonia after roughly 60 hours ^[61].

Assessment

The assessment of inhalation injury in a child begins clinically and stays clinical. While the diagnosis remains largely clinical, bronchoscopy is helpful to diagnose and to grade the severity of any injury ^[4]. Bronchoscopy in burned children identifies the airway findings that drive decisions: in one pediatric series examined by bronchoscopy and laryngoscopy, 17 of 19 children had significant airway edema, 10 had carbonaceous material in the airway, and 3 had ulcerations ^[24]. Bronchoscopy has been valuable both as a diagnostic step and as an indication for tracheotomy in the burned child ^[24].

The most consequential early assessment is whether to secure the airway. The traditional American Burn Association criteria for intubation perform imperfectly: in one study, the sensitivity of ABA criteria for predicting long-term intubation was 77 percent with specificity 46 percent ^[25]. Traditional criteria associated with long-term intubation included suspected smoke inhalation (OR 2.45) and singed facial hair (OR 2.53) ^[25]. The expanded Denver criteria, which add findings such as full-thickness facial burns, stridor, respiratory distress, swelling on laryngoscopy, upper-airway trauma, altered mentation, and hemodynamic instability, increased sensitivity for long-term intubation to 95 percent at the cost of lower specificity (24 percent) ^[25]. The trade-off is explicit: more sensitive criteria capture more children who truly need an airway, but intubate more who do not.

Oxygenation can be tracked noninvasively in children. In burned children with smoke inhalation injury, PaO2/FiO2 and peripheral capillary oxygenation/FiO2 correlate strongly, with a peripheral capillary oxygenation below 92 percent giving the strongest correlation ^[26]. The pulse-oximetry-derived ratio may therefore serve as a surrogate for the arterial ratio, particularly when titrating FiO2 to a peripheral capillary oxygenation of 90 to 95 percent ^[26]. For prognosis, the revised Baux score adds 17 points for the presence of inhalation injury to age plus percent TBSA burned ^[27], and an optimal revised-Baux threshold of 85 has been used to predict mortality and ICU admission ^[27].

Toxic-gas assessment requires deliberate testing because the clinical signs are nonspecific. Carboxyhemoglobin is the measurable marker of carbon monoxide exposure; in one closed-space fire-death series all cases had positive carboxyhemoglobin levels, with 76.2 percent above 10 percent and soot contamination of the upper and lower respiratory tracts in 77.7 percent ^[60]. Cyanide measurement is less consistently obtained: in victims of enclosed-space and motor-vehicle fires, cyanide levels were toxic in 47 percent and lethal in 13 percent of cases ^[15], yet cyanide poisoning is challenging to diagnose and is easily missed when not specifically sought ^[16].

Management

Management of pediatric inhalation injury is supportive and built around the airway. Children with major burns require emergent resuscitation that is similar to adults, including pain control, airway management, and intravenous fluid administration ^[29]. The classic supportive regimen consists of intubation for signs of respiratory distress, pulmonary toilet, humidification of inspired air, and antibiotics for documented infection ^[3]. The first decision is whether the airway needs protection: endotracheal intubation is essential in cases where upper-airway obstruction may occur, although the cited review cautions that it carries its own risks and should not be performed prophylactically in all cases of inhalation injury ^[4]. For children whose presentation is inspiratory stridor rather than obstruction, nebulized epinephrine has been used as a temporizing measure, with one pediatric scald-airway series reporting symptom resolution in 3 to 4 days in children managed with epinephrine nebulization while more marked respiratory distress required intubation and ventilation ^[31].

Nebulized adjuncts

The most-cited pediatric airway adjunct is the aerosolized heparin and N-acetylcysteine regimen. In a pediatric cohort, 47 children received 5,000 units of heparin and 3 mL of a 20 percent solution of N-acetylcysteine aerosolized every 4 hours for the first 7 days after injury ^[32]; the regimen was associated with a significant decrease in reintubation rates, incidence of atelectasis, and mortality compared with controls ^[32]. The authors concluded that heparin/N-acetylcysteine nebulization in children with massive burn and smoke-inhalation injury produced a significant decrease in reintubation for progressive pulmonary failure and a reduction in mortality ^[32]. A dose-finding study in burn inhalation injury found that nebulized heparin may reduce fibrin-cast formation and the degree of airway obstruction ^[33]; in that study nebulized heparin 10,000 IU, given in alternation with N-acetylcysteine, decreased lung-injury scores and duration of mechanical ventilation but had no effect on ICU length of stay or mortality ^[33], and the higher dose was safe with no effect on coagulation parameters ^[33]. A pediatric pilot randomized children to standard of care consisting of nebulized acetylcysteine, nebulized heparin, and nebulized albuterol, with or without added nebulized epinephrine ^[34]; no adverse events were observed during or after epinephrine nebulization and no deaths were attributable to it ^[34].

Mechanical ventilation

Lung support follows ARDS principles. Positive end-expiratory pressure and continuous positive airway pressure improve oxygenation primarily by increasing functional residual capacity and may increase lung compliance and decrease the work of breathing ^[35]. Ventilator burden is a recurring outcome measure in critically injured children: in a pediatric trial of 1:1 versus 4:1 packed-red-cell-to-fresh-frozen-plasma transfusion ratios during burn excision in children with burns over 20 percent TBSA, ventilator days and length of stay did not differ between ratios ^[49]. North American pediatric burn units have not converged on a single ventilator approach, and practice patterns diverge between large and small centers regarding cuffed endotracheal tubes and the timing of tracheostomy ^[54]. Pulmonary toilet is part of the routine: in inhalation-injured patients, chest physiotherapy reduced the incidence of pneumonia, with a hazard ratio of 0.27 (95% CI 0.13 to 0.54) for first pneumonia in the chest-physiotherapy group after propensity matching ^[36], and the authors reported that chest physiotherapy reduces pneumonia and facilitates patient mobilization following inhalation injury ^[36].

Carbon monoxide and cyanide

Toxic-gas treatment is specific and time-sensitive. One center's recommended antidotes are hydroxocobalamin for cyanide and hyperbaric oxygen for carbon monoxide ^[16]. Hydroxocobalamin has been administered empirically after enclosed-space fires when inhalational injury and potential cyanide toxicity are a concern. Cyanide-antidote administration to survivors via immediate intravenous injection after smoke exposure has been advocated in forensic-toxicology work where antidote use was conspicuously absent in fire victims who received medical treatment ^[60].

Extracorporeal support

For the child whose lung fails despite maximal support, extracorporeal membrane oxygenation is a rescue. A systematic review of extracorporeal life support in pediatric burn care found that ECMO provides an additional level of support in pediatric patients and is associated with positive outcomes ^[37], with veno-venous ECMO demonstrating the best overall survival of the configurations and outcomes similar to non-burned patients ^[37]; in the same review, prolonged mechanical ventilation before ECMO decreased survival, increasing mortality by 12 percent with each additional day off ECMO ^[37]. A disaster-cohort series concluded that ECMO may be a lifesaving modality for burn patients with severe lung injury who are nonresponsive to maximal medical management, especially in young patients with early intervention ^[38].

Interaction with fluid resuscitation

Inhalation injury changes the volume math. A study separating burn patients with and without smoke inhalation found that the increase in fluid requirement related to the presence of inhalation injury was independent and additional to the burn injury itself ^[28], with the inhalation effect reflected in a y-intercept difference of roughly 30 mL/kg/24 hr between the two groups' fluid-requirement equations ^[28]. In pediatric practice, fluid resuscitation is needed for burns at or above 15 percent TBSA in children compared with 20 percent or more in adults ^[29]. The interaction with airway control is a documented cause of preventable pediatric death: hypovolemia from inadequate prehospital fluid resuscitation and failure to obtain and maintain a patent airway were judged the second and third most common contributors to a child's death in one analysis of pediatric burn fatalities ^[30], and the most notable areas for improvement in those deaths were fluid resuscitation and airway control ^[30].

Complications

The complications of pediatric inhalation injury are pulmonary, infectious, and laryngeal. Pneumonia is the central pulmonary complication, and inhalation injury sits among its risk factors. Complications are frequent in patients with severe burns and inhalation injuries, increasing length of hospital stay and mortality ^[42], and burned patients with complications had higher burn-injury severity, longer hospitalization, and higher mortality ^[42]. Infection is the dominant complication class. In pediatric burns, the presence of inhalation injury and the total burned surface area were both strongly associated with the development of sepsis and persistent inflammation, immunosuppression, and catabolism syndrome ^[40], with an overall prevalence of sepsis of 30 percent and of that syndrome of 15 percent among burn-injured children ^[40]. Multidrug-resistant organisms track burn size: for each additional 10 percent of TBSA, the isolation of multidrug-resistant organisms increased 2.58 to 17.57 times, and the extent of TBSA was the most important factor affecting their isolation ^[41].

The laryngotracheal complications are distinctly pediatric in their long arc. Dysphonia is common after inhalation injury and persists in a meaningful minority: dysphonia occurs in roughly one of every two burn patients with inhalation injury, and a quarter of patients with severe injury still have persistent dysphonia at six months ^[39]. The most severe airway complication is fixed stenosis. The management of laryngotracheal stenosis in the pediatric burn patient is complex and requires a multidisciplinary approach ^[44], and the mainstay of treatment is laryngotracheal reconstruction, for which burn-specific techniques are only sparsely reported ^[44].

Special Considerations

The pediatric airway and the pediatric course differ enough from the adult that adult assumptions can mislead. Unique to pediatrics is the additional assessment for non-accidental injury and the accurate calculation of percent TBSA in children whose body proportions change with age ^[29]. Non-accidental injury is a real fraction of pediatric burns: 16 percent of burn injuries are not accidental, and approximately half of these result from documentable inflicted abuse ^[7].

The downstream airway problem is the part that most distinguishes children. Laryngotracheal stenosis after burn airway injury is a complex multidisciplinary problem in children, and burn-specific laryngotracheal reconstruction is only sparsely described ^[44]. Rehabilitation extends beyond the airway: a randomized trial of Wii-based aerobic training in children after inhalation injury and thermal burn reported positive effects on pulmonary function tests, chest expansion, the six-minute walk test, and the timed up-and-go test ^[57].

Age weights the mortality math differently in children. In an age-specific pediatric mortality model, predicted mortality decreased with age, and inhalation injury had a greater effect on mortality than in an all-ages model ^[59]; overall mortality in that series was 4 percent but varied sharply by age, from 17 percent in seniors to under 1 percent in children ^[59]. The implication the authors drew was that age-group-specific models for children and seniors may be advisable ^[59].

Prevention deserves a place because the exposure is preventable. Smoke-alarm design affects whether a child wakes: in a randomized trial, maternal voice alarms awakened 86 to 91 percent of sleeping children and prompted 84 to 86 percent to escape, compared with 53 percent awakened and 51 percent escaping with the conventional tone alarm ^[58], and a sleeping child was 2.9 to 3.4 times more likely to be awakened by a voice alarm than by the tone alarm ^[58].

Outcomes

Inhalation injury is the variable that most degrades the prognosis of an otherwise survivable pediatric burn. Univariate analysis identifies age, total burned surface area, full-thickness burn, and inhalation injury as significant impactors on survival ^[46]. The independent contribution of inhalation injury to mortality is real but, in some analyses, modest once burn size and age are accounted for: the presence of inhalation injury is significantly associated with mortality after thermal injury but adds little to mortality prediction beyond percent TBSA and age ^[47]. In the modern meta-analysis the association is strong, with inhalation injury carrying an odds ratio for mortality of 6.67 against a pooled mortality of 3 percent ^[8].

The pulmonary failure that follows inhalation is now a leading mortality mechanism in burned children, partly because better control of sepsis, earlier surgery, and improved nutrition removed competing causes ^[6]. Where children die in fires, respiratory burns with smoke or carbon monoxide account for a third of deaths ^[10]. Carbon monoxide load tracks fatal smoke inhalation, with carboxyhemoglobin concentrations corresponding well with death from smoke inhalation ^[17].

Survivors carry measurable sequelae. Severe inhalation injury is associated with dysphonia, with poorer resolution at six months and with longer intubation duration ^[39]. Among children supported through inhalation-associated respiratory failure with ECMO, veno-venous configurations achieved survival similar to non-burned patients, while delay to cannulation worsened survival ^[37]. Function-focused rehabilitation can improve pulmonary and exercise outcomes in children after inhalation injury and burn ^[57].

Controversies and Evidence Gaps

The pediatric inhalation-injury literature is thinner and more contested than its prominence in mortality would suggest.

No consensus diagnostic definition. There is significant variation in the prevalence of documented inhalation injury among burns units, the burns community has not formed a consensus on diagnostic criteria and clinical definitions, and the literature explicitly calls for a consensus definition ^[48]. This unsettled definition propagates into every comparison of incidence and outcome.

Pharmacologic adjuncts. The efficacy of many widely used pharmacologic adjuncts in inhalation injury remains uncertain ^[4]. The nebulized heparin and N-acetylcysteine regimen has favorable pediatric data on reintubation and mortality from a single program ^[32], but a dose-finding study found that nebulized heparin reduced lung-injury scores and ventilator duration without changing ICU length of stay or mortality ^[33]; the two findings sit side by side without a definitive trial to reconcile them.

Prophylactic antibiotics. The role of prophylactic antibiotics is genuinely contested. One study found that the development of pneumonia is not influenced in a statistically significant way by the use of prophylactic antibiotics ^[50], yet the same authors stated they do recommend prophylactic antibiotic therapy for patients with diagnosed inhalation trauma because their mortality was lower than in comparison studies ^[50]. Separately, pneumonia has been identified as an independent risk factor for mortality when no antibiotic prophylaxis is used in burn patients ^[51]. The cited sources disagree, and no high-quality pediatric trial settles the question.

Intubation thresholds and tracheostomy. Considerable controversy exists as to whether tracheostomy is ever indicated in burn patients ^[53]. Pre-burn-center over-intubation is a recognized problem, and the literature calls for prehospital education to reduce unnecessary intubation of the burn patient ^[55]. Pediatric burn units diverge on ventilator modes, cuffed-tube use, and tracheostomy timing, and the authors of that survey called for clinical trials to clarify these choices ^[54].

Inhalation score and ARDS. Whether a structured inhalation-injury score predicts ARDS is unresolved: one prospective study found no association between inhalation injury assessed by an inhalation lung injury score and the development of ARDS ^[52]. This undercuts the assumption that bronchoscopic grade maps cleanly onto parenchymal outcome. Consistent with that, autopsy comparison found no significant difference in the mean degree of airway obstruction between smoke-inhalation-plus-burn victims and burn-only victims ^[43].

Progress over time. The most sobering gap is the slow pace of improvement. A review framed inhalation injury as a decade without progress, observing that sophisticated diagnostic and management techniques did not appear to decrease the mortality rate associated with inhalation injury ^[56]. Whether contemporary lung-protective ventilation, ECMO, and toxic-gas antidotes have changed that trajectory in children specifically is not established by the available pediatric evidence.

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