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Groups of patients graded according to depth of mucosal damage estimated by fiberoptic bronchoscopy on admission, in line with Chou’s classification[3]
| Grade | Number of patients | Findings |
|---|---|---|
| G0 |
0 |
Negative (no mucosal damage) |
| Gb |
0 |
Positive (mucosal damage) confirmed by biopsy |
| G1 |
12 |
Mild edema + hyperemia, with or without carbon soot |
| G2 |
8 |
Severe edema + hyperemia, with or without carbon soot |
| G3 | 0 | Ulceration, necrosis, no cough reflex or bronchial secretions |
