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Causes of SE in grades 3 to 5
| Etiology | Pneumothorax with background of COPD | Trauma due to rib fracture | Iatrogenicity | Barotrauma |
|---|---|---|---|---|
| Grade 3 | N = 5 (42 %) | N = 4 (33 %) | N = 2 (17 %) | N = 1 (8 %) |
| Grade 4 | N = 5 (42 %) | N = 6 (50 %) | N = 1 (8 %) | N = 0 |
| Grade 5 | N = 2 (18 %) | N = 1 (9 %) | N = 6 (55 %) | N = 2 (18 %) |
