Table 2.
Spontaneous Pneumomediastinum Compared with Secondary Pneumomediastinum
| Clinical parameters | SPM (N=37) | Secondary PM (N=50) | P-value |
|---|---|---|---|
| Age, mean (SD) | 54.6 (25.5) | 50.3 (21.3) | 0.40 |
|
| |||
| Females, n (%) | 13 (35.4) | 9 (18) | 0.07 |
|
| |||
| Diagnostic chest radiograph, N (%)* | 21 (56.7) | 22 (44) | 0.46 |
|
| |||
| Associated pneumothorax, N (%) | 7 (18.9) | 29 (58) | <0.01 |
|
| |||
| Associated pleural effusions, N (%) | 0 (0) | 9 (18) | 0.01 |
|
| |||
| Associated atelectasis, N (%) | 5 (13.5) | 16 (32) | 0.05 |
|
| |||
| Subcutaneous emphysema, N (%) | 18 (48.7) | 37 (74) | 0.02 |
|
| |||
| Chest tube placement, N (%) | 8 (21.6) | 30 (60) | <0.01 |
|
| |||
| LOS, mean (SD) | 3.9 (1.8) | 5.3 (1.9) | <0.01 |
|
| |||
| In-hospital Mortality, N (%) | 0 (0) | 5 (10) | 0.048 |
SPM=Spontaneous pneumomediastinum; PM=Pneumomediastinum;
*
The diagnosis of pneumomediastinum was made based on the Chest X-ray.