Table 2.
Changes in the pulmonary function and Haller index after the bar insertion
| Symmetric type (n = 9) | Asymmetric type (n = 9) | p | |
|---|---|---|---|
| Preoperative PF | |||
| Restrictive, n (%)a | 0 (0) | 1 (5.6) | 1 |
| Obstructive, n (%)b | 0 (0) | 0 (0) | 1 |
| Postoperative PF | |||
| Restrictive, n (%) | 1 (5.6) | 4 (22.2) | 0.294 |
| Obstructive, n (%) | 0 (0) | 0 (0) | 1 |
| Preoperative HIc | 3.8 ± 0.8 | 3.8 ± 1 | 0.971 |
| Postoperative HI | 2.7 ± 0.4 | 2.8 ± 0.2 | 0.387 |
HI = Haller index; PF = pulmonary function.
aThe restrictive pattern is forced volume capacity (FVC) and forced expiratory volume in 1 second (FEV1) values of less than 80% predicted and an FEV1/FVC ratio greater than 80%.
bThe obstructive pattern is a FEV1/FVC ratio of less than 67%.
cThe Haller index is calculated as the inner transverse thoracic diameter divided by the anteroposterior distance between the anterior thoracic wall and the spine at the narrowest point.