Table 2.
—WA% and TBA by Airway Segment Along Six Bronchial Paths, Lobar Emphysema, and Lobar Volume in 983 Subjects With COPD
| WA%a |
TBA, mm2a |
||||||
| Bronchial Path | Segmental | Subsegmental | Segmental | Subsegmental | Lobe | Lobar Emphysema, % | Lobar Volume, mLb |
| RB1 | 61.86 ± 4.55 | 64.36 ± 3.27 | 55.8 ± 18.8 | 32.8 ± 10.1 | RUL | 9.2 (2.8-22.2) | 1,333 ± 380 |
| RB4 | 62.47 ± 3.96 | 65.10 ± 3.06 | 42.8 ± 15.1 | 24.1 ± 6.8 | RML | 9.2 (3.7-18.4) | 479 ± 169 |
| RB10 | 60.77 ± 4.16 | 64.55 ± 3.26 | 55.0 ± 15.3 | 32.9 ± 9.2 | RLL | 6.5 (2.2-17.4) | 1,430 ± 401 |
| LB1 | 64.11 ± 3.62 | 66.32 ± 3.15 | 41.9 ± 12.7 | 27.2 ± 7.9 | LUL | 9.8 (3.8-21.2) | 1,501 ± 399 |
| LB4 | 62.20 ± 3.86 | 64.86 ± 3.48 | 42.9 ± 15.8 | 24.6 ± 8.2 | LLL | 6.6 (2.6-16.3) | 1,361 ± 414 |
| LB10 | 59.73 ± 4.22 | 64.41 ± 3.37 | 61.0 ± 16.6 | 35.9 ± 10.3 | … | … | … |
Data are presented as mean ± SD or median (interquartile range). LB1 = left upper lobe apicoposterior bronchus; LB4 = superior lingular bronchus; LB10 = left lower lobe posterior basal bronchus; LLL = left lower lobe; LUL = left upper lobe; RB1 = right upper lobe apical bronchus; RB4 = right middle lobe lateral bronchus; RB10 = right lower lobe posterior basal bronchus; RLL = right lower lobe; RML = right middle lobe; RUL = right upper lobe; TBA = total bronchial area; WA% = wall area percent.
P < .0001 for segmental vs subsegmental WA% and segmental vs subsegmental TBA in each bronchial path. P values were calculated with paired t test.
Lobar volume data were missing in 33 subjects.