Grade | Class | Description |
0 | No injury | Absence of carbonaceous deposits, erythema, edema, bronchorrhea or obstruction |
1 | Mild injury | Minor or patchy areas of erythema, carbonaceous deposits in proximal or distal bronchi* |
2 | Moderate injury | Moderate degree of erythema, carbonaceous deposits, bronchorrhea, or bronchial obstruction* |
3 | Severe injury | Severe inflammation with friability, copious carbonaceous deposits, bronchorrhea or obstruction* |
4 | Massive injury | Evidence of mucosal sloughing, necrosis, endoluminal obliteration* |
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