Inhalation Injury Diagnosis and Severity Grading

Overview

Inhalation injury is the diagnosis you cannot afford to miss and cannot easily confirm. It is an acute insult of the respiratory tract from inhaled heat, toxic gases, chemical irritants, and the particulate matter of smoke; mechanistically it is a chemical tracheobronchitis ^[10][16]. The injury is present at the moment of exposure but stays clinically inapparent for the first 48 to 72 hours, and respiratory failure is typically preceded by only a 12 to 48 hour window of minor symptoms ^[4][17]. That latency is the central clinical problem: by the time the patient looks sick, the therapeutic window for anticipating the course has narrowed. The injury operates through three primary mechanisms, airway edema and obstruction, hypoxemic respiratory failure, and pneumonia, and is partitioned anatomically into supraglottic, subglottic, and systemic components ^[18][19].

Grading matters because inhalation injury is a major cause of burn morbidity and mortality and an independent predictor of death, yet it is notoriously difficult to quantify, historically reliant on a nonspecific clinical exam plus bronchoscopy ^[20][3]. A grade does real clinical work: it stratifies the risk of ARDS, pneumonia, and prolonged ventilation, and it informs triage and resuscitation planning ^[12][21]. The unresolved tension that runs through this page is that the field has no universally accepted, objective grading standard, the dominant bronchoscopic schemes are subjective with poor inter-rater reliability, and the link between grade and mortality is contested even as the link between grade and lung complications is robust ^[6][7].

Epidemiology

Inhalation injury is present in roughly one-third of major burn or burn-center patients, the figure cited most consistently across decades and still repeated in recent literature ^[22][23]. The largest pooled estimate sets a lower anchor: a meta-analysis of 54 studies and 408,157 patients calculated a pooled prevalence of 15.7% (95% CI 13.4 to 18.3%) ^[24]. The gap between one-third and one-sixth is itself a diagnostic signal, because documented prevalence varies significantly between centers and by classification method, reflecting the absence of a shared definition rather than true biological variation ^[25].

Risk rises with burn size, older age, and closed-space fires. Incidence climbs monotonically with burn extent: inhalation injury was observed in only 2.2% of burns under 20% TBSA but 14% of burns of 80 to 99% TBSA ^[26][27]. The epidemiologic mortality contribution is large and consistent. Inhalation injury independently raises the odds of in-hospital death, with a summarized odds ratio near 3.2 (95% CI 2.5 to 4.3); historically, 60 to 70% of burn-center fatalities are attributed to the pulmonary complications of inhalation injury ^[24][28]. Added to a cutaneous burn, inhalation injury raises TBSA-matched mortality by up to roughly 20% above the expectation from age and burn extent ^[29].

Pathophysiology

The lesion that diagnostic tests detect is destruction of the ciliated tracheobronchial epithelium, producing mucosal hyperemia, edema, erosion, ulceration, slough, and pseudomembranous tracheobronchitis, the visible substrate that every bronchoscopic grading scheme reads ^[30][31]. The small airway is the primary site of injury; obstruction from edema, bronchospasm, and fibrin and cellular casts drives progressive hypoxia, while subglottic injury increases bronchial blood flow, disables the mucociliary escalator, and produces V/Q mismatch and shunt ^[31][32].

Two features of the pathophysiology are load-bearing for diagnostic timing and workup. First, the injury may be present immediately but clinically inapparent for 48 to 72 hours, which is why diagnosis cannot wait for clinical deterioration ^[4][17]. Second, smoke inhalation carries systemic poisons the workup must address: it comprises direct thermal damage, carbon monoxide poisoning, and cyanide poisoning, with CO a primary cause of death and CO and cyanide acting synergistically ^[33][34]. Carboxyhemoglobin is a marker of injury severity that correlates with pulmonary shunt fraction, though, as the assessment section details, it does not track the histologic degree of lung injury ^[35][36]. Injury severity also correlates with the airway and systemic inflammatory load; plasma immune mediators increase with worse grade even after adjustment for age and TBSA, which is part of the argument for grading the injury rather than treating it as binary ^[37]. That argument is not universal: in severely burned children, an added inhalation injury did not augment the early systemic inflammatory response ^[38].

Classification

For a diagnosis and severity topic, the classification systems are the clinical core, and they fall into three families: bronchoscopic mucosal grades, composite inhalation-specific severity scores, and burn-severity indices that carry an inhalation component.

Bronchoscopic grading systems

Fiberoptic bronchoscopy is the modality on which grading rests; it establishes the anatomic level and severity of large-airway injury and distinguishes a supraglottic from an infraglottic component ^[11]. Bronchoscopic abnormalities are graded mild, moderate, or severe by mucosal congestion, edema, necrosis, hemorrhage, and ulceration, and severity tracks recovery time, with mild injury resolving in about one week and severe injury in about three weeks ^[39].

The dominant scheme is the Abbreviated Injury Score (AIS) bronchoscopic grading, grades 0 to 4: 0 no injury, 1 mild, 2 moderate, 3 severe, 4 massive ^[12][40]. Its origin is the landmark Endorf and Gamelli 2007 cohort, which classified patients into five groups (0 to 4) from initial bronchoscopy on AIS criteria; with groups well matched for TBSA, grades 2, 3, and 4 had significantly worse survival than grades 0 or 1 (P = .03) ^[41]. Independent validation by Mosier in 2012 showed the grade rose with carboxyhemoglobin and worsened oxygenation, and produced a steep ARDS gradient: ARDS incidence at 24 hours by grade was 0%, 22%, 57%, and 80% across grades 0 to 3 (P < .01) ^[12]. A mucosal-depth scheme (Chou 2004, grades 0 to 3) found acute lung injury rates of 3.8%, 4%, 33%, and 77% by deepening mucosal injury ^[42].

Several three-category schemes (none-mild, moderate, severe) map grade to mortality. Aung 2018 reported mortality of 2.3%, 7.4%, and 30.7%, with only the severe group independently associated with mortality (OR 20.4) and the moderate group associated with longer ventilation only ^[43]. A large 443-patient series reported mortality of 1.0%, 13.0%, and 36.8% across mild, moderate, and severe injury, with severity correlating with TBSA, laryngeal burn severity, and tracheotomy rate ^[44]. A complementary epithelial-injury scheme (first, second, third degree) grades by hyperemia and edema, then erosion and petechial hemorrhage, then necrosis and exfoliation, with ventilation duration of 2 days versus 14 days separating second- from third-degree injury ^[45].

The descriptive mucosal score of Ikonomidis 2012 was built specifically to standardize the diagnosis, grading ENT and tracheobronchial lesions as 1 (edema, hyperemia, hypersecretion), 2 (bullous mucosal detachment, erosion, exudates), and 3 (profound ulcers, necrosis); it provides a unified language and flags upper-airway involvement, and it found that burned vibrissae and a suspected history were insufficient diagnostic criteria ^[46]. The older Moylan anatomic classification stratifies by site (upper-airway, major-airway, parenchymal) ^[47]. A landmark comparison found virtual bronchoscopy gives severity scores similar to fiberoptic bronchoscopy and correlates with the P/F ratio, with fiberoptic bronchoscopy 80.3% specific and 77% sensitive versus virtual bronchoscopy 67.2% specific and 85.5% sensitive for a P/F ratio of 300 or below ^[48].

Inhalation-specific severity scores

Composite scores attempt what a single bronchoscopic grade cannot. The Inhalation Injury Severity Score (I-ISS) is the standout: in a head-to-head of three systems graded at bronchoscopy within 24 hours (AIS, I-ISS, and a mucosal score), inter-system agreement was strong (Krippendorff's alpha 0.85), but only I-ISS was independently associated with overall survival (score 3 vs 1 to 2: OR 13.16, 95% CI 1.65 to 105.07; P = .02), with the authors attributing the AIS and mucosal-score failure to injury progression after the initial assessment ^[23]. A 5-point pneumonia-risk scale assigns one point each for age over 60, TBSA over 20%, bronchoscope grade 3 to 4, initial P/F ratio of 300 or below, and initial carboxyhemoglobin over 10%, with a score of 2 or more flagging high pneumonia risk ^[49]. An earlier quantitative framework combined chest radiograph, P/F ratio, peak inspiratory pressure, and bronchoscopy ^[50].

Burn-severity indices with an inhalation component

The revised Baux score adds 17 points for inhalation injury to age plus TBSA; it is simple and accurate for burn mortality, with an AUROC of 0.96 (95% CI 0.95 to 0.97) overall, dropping to 0.81 in a high-Baux subgroup ^[51][52]. The Abbreviated Burn Severity Index (ABSI) awards an extra point for inhalation injury and is a strong survival predictor ^[53]. In a head-to-head of indices in adults with 20% TBSA or more, burn formulae outperformed APACHE II, with the revised Baux best calibrated (AUROC 0.908) while ABSI and the original Baux discriminated well but overestimated mortality ^[54]. A modified ABSI was built specifically because no accepted inhalation severity grading exists, reaching a c-statistic of 0.94 ^[55]. The Prognostic Burn Index (burn index plus age, used especially in Japan) strongly predicts in-hospital mortality, with inhalation injury requiring mechanical ventilation an independent risk factor (OR 13.0) ^[56]. Downstream, the ARDS Berlin definition stratifies burn-ARDS severity and predicts mortality better than the older definition ^[57][58], although the Berlin criteria may not fully apply to early burn ARDS ^[59]. A chest radiograph grading scale (0 to 4+) has been proposed as a reporting standard ^[60].

Assessment

Diagnosis is multimodal, and the modalities sort cleanly by sensitivity. Bronchoscopy is the reference standard; functional and radionuclide tests catch early parenchymal injury the scope cannot see; chest radiograph and isolated clinical signs are the weakest and most misleading.

Bronchoscopy as the reference standard

Bronchoscopy is the accepted reference modality for diagnosing inhalation injury, named as such across decades ^[11][61]. The key performance datapoint: against histology as the gold standard, admission bronchoscopy in 130 burn patients was sensitive (0.79) and highly specific (0.94), and more reliable than the circumstances of injury, the clinical findings, or complementary tests ^[5][62]. The earliest landmark validation established that fiberoptic bronchoscopy is a simple, safe, and accurate method that identifies both the anatomic level and the severity of large-airway injury, with its only failure mode the immediate postburn period during hypovolemic shock ^[11]. Bronchoscopy-proven injury is one of the most strongly predictive single variables for ARDS onset and death, with an adjusted OR of 45.4 for severe bronchoscopic injury on multivariate analysis ^[63]. The grade also moderately correlates with early gas-exchange impairment, worsening with oxygenation indices at 24, 48, and 72 hours ^[12].

Bronchoscopy has two stated limits. It assesses only the proximal airway and does not comprehensively characterize parenchymal insult ^[64]. And it carries procedural risk: it is not recommended in acutely hypoxemic intubated patients on high FIO2, admission bronchoalveolar lavage is associated with increased pneumonia risk, and serial bronchoscopies performed to track progression may provide more risk than benefit ^[65][66]. Where injury is complicated by pneumonia, at least one bronchoscopy shortened mechanical ventilation (21 vs 28 days) and ICU stay ^[67].

Imaging adjuncts

The admission chest radiograph is insensitive, the central null finding of the assessment literature: significant lung damage can be present with a normal initial film, and in one series admission radiograph plus PaO2 plus auscultation were normal in 90% and could not predict respiratory failure or death ^[8][68]. It is vastly less sensitive than radionuclide imaging; only 17.6% of fire victims had an abnormal radiograph versus 82.4% abnormal on a DTPA scan ^[69]. Serial radiographs retain value for monitoring complications rather than initial diagnosis ^[70].

Chest CT adds value the radiograph cannot. An admission bronchial-wall-thickness cutoff over 3.0 mm predicted pneumonia with 79% sensitivity and 96% specificity, and also predicted ventilator and ICU days ^[71]. CT airway-narrowing cutoffs and admission CT complement bronchoscopy in predicting adverse outcome, with bronchoscopy plus a high CT score producing a 12.7-fold increase in the composite endpoint ^[72][64]. CT detects parenchymal lesions the radiograph misses, although the clinical benefit of CT severity staging remains debated ^[73].

Radionuclide imaging is the most sensitive early functional test. The xenon-133 V/Q scan is interpreted as normal when there is complete clearance of the radioactive gas by 150 seconds; it is often abnormal days before the chest radiograph, and combining it with bronchoscopy virtually eliminates false negatives by capturing both small- and large-airway injury ^[74][75]. Technetium-99m DTPA radioaerosol clearance flagged 82.4% of fire victims as abnormal, far outperforming radiograph and pulmonary function testing ^[69][76], though one report found DTPA clearance of limited clinical value despite animal promise ^[77]. A technetium-99m HMPAO lung scan offered a sensitive noninvasive option in patients with symptoms but a negative radiograph and pulmonary function test ^[78].

Blood gas, co-oximetry, and biomarkers

The P/F ratio is lower in inhalation injury on admission and correlated with mortality in adults where carboxyhemoglobin did not ^[79][3]. The A-a oxygen gradient is a foundational early metric predictive of pulmonary dysfunction ^[80]. Carboxyhemoglobin is an important null theme: it cannot predict the degree of lung injury, shows no significant correlation with histopathology, and is not significant in multivariate mortality models, even though it correlates with gas-exchange physiology and rises with AIS grade ^[81][82][36]. Diagnosis of CO exposure is best supported by carboxyhemoglobin over 10% combined with lactate, an enclosed-fire history, and altered consciousness ^[83][84]. Cyanide is difficult to assay rapidly, so elevated plasma lactate plus an enclosed-space fire and hypotension serve as practical biochemical surrogates for cyanide exposure; cyanide level does not track smoke-inhalation extent in fatal cases ^[85][86]. In burned children, the SpO2/FIO2 ratio is a usable noninvasive surrogate for the P/F ratio ^[87].

Bronchoalveolar lavage and cytology grade severity but carry caveats: pediatric BAL correlated poorly with radiographic pneumonia (PPV 21%, NPV 81%), tracheobronchial cytology scoring correlated with clinical and bronchoscopic scores, and BAL neutrophilia preceded ARDS ^[88][89][90]. Admission BAL is associated with increased pneumonia risk, arguing for judicious use ^[66]. Among biomarkers, the 20S proteasome is the best-performing single diagnostic marker, discriminating injury with sensitivity 0.88 and specificity 0.71 in burned patients but not predicting survival ^[91]. Plasma IL-1 receptor antagonist is independently associated with mortality after adjustment for age, TBSA, and grade (OR 3.12) ^[92][37]. Plasma sST2 in the first 24 hours predicted pneumonia (AUROC 0.929), and pulmonary suPAR is diagnostically elevated while systemic suPAR is prognostic ^[93][94]. Ubiquitin correlates inversely with injury grade and fluid requirements ^[95]. The recognized gap is the lack of validated diagnostic biomarkers ^[96].

Emerging tools and the limits of clinical signs

Point-of-care optical coherence tomography measures airway mucosal thickness to diagnose early ARDS, and a fine-tuned vision-transformer deep-learning model graded bronchoscopy images at 98% accuracy, framed as more accurate than human visual scoring ^[97][98]. A gradient-boosting machine-learning model differentiates mild from severe injury from day-1 admission data for settings where bronchoscopy is unavailable ^[99]. Against all of this, isolated clinical signs are unreliable: singed nasal hair, carbonaceous sputum, and facial burns showed poor discrimination against bronchoscopy (AUC below 0.7, kappa below 0.4), even with an enclosed-space mechanism ^[9]. Clinical manifestations may be delayed up to 72 hours and do not gauge 24-hour severity, although soot, dysphonia, and rhonchi retain some predictive value for complications ^[100][46]. The consensus practice is composite diagnosis combining history, physical exam, bronchoscopy, and laboratory findings, and flexible laryngoscopy can reduce unnecessary intubation in stable patients ^{[14][101][102]}.

Management

This page is about how the diagnosis and grade drive decisions, not a ventilation or pharmacotherapy treatise; those are sibling topics. The grade does four things in clinical decision-making.

First, it stratifies care intensity by anticipating the multi-organ course. Higher bronchoscopic grade confers worse survival even when TBSA is well matched, and severe AIS grade independently predicts MODS, ARDS, pneumonia, and prolonged ventilation, so a severe grade is actionable for anticipating lung failure ^[41][21]. The dose-response ARDS gradient (0%, 22%, 57%, 80% by grade at 24 hours) and the three-level mortality and ventilation stratification let the team plan resource use before deterioration ^[12][43].

Second, endoscopic findings drive the intubation decision, in both directions. Bronchoscopy and laryngoscopy diagnose injury and directly enable the airway decision; in one algorithm fibroscopy was determinant in proceeding to intubation, and direct visual inspection also helps avoid unnecessary intubation ^[103][104]. Toilet bronchoscopy in isolated smoke-inhalation patients both clears mechanical obstruction and allows earlier ventilator liberation ^[105].

Third, the label alone is not an automatic intubation trigger. The diagnosis of smoke inhalation per se is not an indication for intubation, with intubation rates diverging sharply by associated burn (12% of non-burn vs 62% of burn patients), so the grade and context drive the airway decision, not the diagnostic label ^[106]. Sources warn against prophylactic intubation in all cases; in one confirmatory cohort, 57% of patients intubated on suspicion could not have inhalation injury confirmed ^{[107][108][9]}.

Fourth, the diagnosis informs triage, transfer, and resuscitation. ABA criteria recommend transfer of inhalation-injury patients to a burn center, yet inappropriate triage occurred in more than three of four such patients within one burn network ^[109]. Diagnosed inhalation injury quantitatively raises resuscitation needs (5.76 vs 3.98 mL/kg/%TBSA), so the diagnosis changes the fluid plan, and diagnosis by bronchoscopy flags the sickest cohort with the greatest increases in mortality and resource use ^[110][101].

Complications

The complications scale with grade, which is the strongest argument for grading at all. Nosocomial pneumonia rises with grade and with associated burn: high-grade injury carries roughly double the hazard of nosocomial pneumonia (cause-specific HR 2.04), with pneumonia rates of 48% in high-grade versus 31% in low-grade versus 14% in no injury ^[13]. More severe injury (AIS 3 to 4 vs 1 to 2) is associated with higher pneumonia (risk difference 0.319) and ARDS (0.242) ^[2]. Among inhalation-injury patients, an associated burn of 20% TBSA or more roughly triples the pneumonia rate, and inhalation injury plus pneumonia doubles mortality (19% vs 9%) ^[111][112].

ARDS scales steeply with bronchoscopic grade (e.g., 3.8% at grade 0 to 77% at grade 3), and bronchoscopy-with-biopsy-confirmed injury predicts ARDS (52% vs 7%) ^[42][62]. ARDS prevalence in mechanically ventilated burn patients is about 33%, with mortality rising by Berlin-grade severity ^[97][58].

Procedure-associated harms are part of the diagnostic calculus. Admission bronchoalveolar lavage is associated with increased pneumonia risk, pulmonary lavage at bronchoscopy was independently associated with more ventilator days (OR 1.84) and higher sepsis (OR 7.2), and saline lavage causes profound transient hypoxemia ^[66][113]. Late airway sequelae tied to severity and intubation include tracheal stenosis (incidence about 5.5% among inhalation-injury patients), tracheomalacia, bronchiectasis, and bronchiolitis obliterans ^{[114][115][116]}. Dysphonia occurs in about 55% of inhalation-injury patients, rising to 87% with severe injury and resolving more poorly with severe grade ^[117][118]. Systemic complications correlated with the diagnosis include acute renal failure, critical-illness-related corticosteroid insufficiency (OR 6.46), and sinusitis ^[119][120], although some adjusted analyses null the independent renal effect after controlling for TBSA and fluids ^[121].

Special Considerations

In children, airway assessment relies mainly on clinical judgment. Routine flexible laryngoscopy had only 29% sensitivity (95% specificity, NPV 91%) for clinical inhalation-injury findings, so it adds little over clinical signs and should be reserved for children with clinical findings ^[15]. Where injury is suspected, bronchoscopy is the diagnostic method used to establish it in large pediatric series, and the SpO2/FIO2 ratio is a noninvasive surrogate for ARDS diagnosis in burned children ^{[122][123][87]}. Pediatric inhalation injury is a stated independent mortality risk factor ^[124]. Scald-related supraglottic thermal injury is rare but real, with stridor the most common sign and bronchoscopy localizing it ^[125].

In pregnancy, fetal cord-blood carboxyhemoglobin can be high despite low maternal carboxyhemoglobin because fetal hemoglobin binds CO 2.5 to 3 times more strongly, which alters CO-poisoning interpretation and provides a physiological basis for early delivery ^[126][84]. COPD does not independently worsen short-term outcomes after fire-related inhalation injury, where systemic toxicity and burn severity dominate ^[127]. Assault and intentional-burn populations have higher documented incidence and worse outcomes ^[128].

Non-burn smoke inhalation is its own population: smoke inhalation without a cutaneous burn carries much lower mortality (under 10 to 11%) than with burns, so the associated burn, not inhalation alone, drives much of the risk ^[129][130]. A modified triage system using selective bronchoscopy, radiograph, and blood gas was useful in a smoke-inhalation mass-casualty incident ^[131]. Specific agents matter: anhydrous ammonia can cause end-stage lung disease, and plastic bronchitis from combined smoke inhalation and influenza A has been documented in children ^[132][133].

Outcomes

Inhalation injury is repeatedly cited as the third major mortality determinant after age and burn size, and as an independent predictor of mortality ^[134][135]. Pooled odds of in-hospital mortality are about 3.2 (95% CI 2.5 to 4.3), with an adjusted OR of 2.35 in one large cohort (31% vs 6% crude mortality) ^[24][136]. The effect is additive with pneumonia, with the combination raising mortality by about 60% ^[112].

Mortality scales with severity grade in a dose-response fashion: mild 1.0%, moderate 13.0%, severe 36.8% in one large series, and severe versus mild injury independently increased mortality (adjusted HR 2.14) in another ^[44][137]. Bronchoscopic findings correlate with mortality, with severe bronchoscopic injury an independent predictor (adjusted OR 45.4) ^[3][63].

The prognostic models put numbers on this. I-ISS was the only scoring system independently associated with overall survival (OR 13.16) ^[23]. The revised Baux score reached an AUROC of 0.96, and burn formulae incorporating inhalation injury outperformed APACHE II and qSOFA ^[51][54][52]. Age plus TBSA plus inhalation injury alone yields strong discrimination (AUC 0.892) ^[138]. Among biomarker and imaging signals, plasma IL-1RA is independently associated with mortality, bronchial wall thickness on admission CT reaches an AUROC of 0.956 for death, and plasma sST2 predicts pneumonia (AUROC 0.929) ^{[37][139][93]}. Long-term, bronchoscopic and histologic healing findings predict pulmonary functional outcome, and children surviving severe thermal injury may not regain normal lung function ^{[140][141][142]}, although a single domestic-fire smoke inhalation does not necessarily imply long-term respiratory consequences ^[143].

Controversies and Evidence Gaps

No universally accepted grading standard exists. There are no worldwide consensus criteria for the diagnosis, severity grading, or prognosis of inhalation injury, and diagnostic criteria remain imprecise enough to prevent objective comparison of published data ^[7][46]. National surveys find variable criteria with no universal shared standard, and the burns community has not formed consensus on definitions, making diagnosis highly subjective with wide prevalence variation across units ^[83][25]. The American Burn Association concluded that there are insufficient data to support a treatment standard for the diagnosis of inhalation injury ^[14].

Bronchoscopic grading is subjective and unreliable. Grading uses manual judgment of visual mucosal features; inter-rater reliability for AIS image grading was clinically inadequate (kappa 0.30, intra-rater 0.45), and the evidence that injury severity affects clinical outcomes is inconsistent, possibly because of misclassification from this subjectivity ^[6]. The AIS grades 0 to 4 have not been validated in burn patients and need additional investigation ^[12][144].

Does grade predict mortality? This is the central debate. Grade reliably predicts ARDS and pneumonia, but multiple cohorts find bronchoscopic grade is not associated with mortality, and a 2025 meta-analysis found higher pneumonia and ARDS with severe grade but insufficient statistical evidence for a mortality association ^{[145][136][2]}. Inhalation injury's mortality association can lose significance after adjusting for disease severity and mechanical ventilation, so mechanical ventilation rather than inhalation injury per se emerges as the risk factor in some models ^[24][82]. Establishing an objective grading system associated with mortality is named as a meaningful research priority ^[145][55].

Individual modalities have hard limits. No satisfactory measure of inhalation injury has been developed; chest radiograph and pulmonary function testing have low sensitivity, carboxyhemoglobin does not correlate with histopathologic injury severity, and classic enclosed-space signs are unreliable even with an enclosed-space mechanism ^[69][81][9]. The DTPA scan and CT-based severity assessment remain of uncertain clinical value ^[77][61].

Biomarkers are immature. The lack of diagnostic biomarkers is a named deficiency, candidate markers are flagged as a research priority, and early gene expression does not differ significantly between inhalation-injury and burn-only patients, indicating an absence of specific diagnostic markers ^[96][146]. The overall evidence base is weak, mostly level 3 or below for lack of large-scale human studies ^[147].

Procedural confounding clouds the data. Many burn patients undergo unnecessary intubation over inhalation-injury concern, whether bronchoscopy itself exacerbates or merely flags injury is an open confounder, and the need for bronchoscopy and elective tracheostomy in suspected injury were among the most controversial issues in a burn-care survey ^{[148][65][149]}. Even the downstream Berlin ARDS criteria may not fully apply in burns, where early burn ARDS shows low mortality regardless of P/F ratio ^[59][150].

References

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