Table 3.

In- and expiratory cross sectional areas at different levels of the central airway

Location	Patient 1	Patient 2	Patient 3	Patient 4	Patient 5
1 cm above aortic arch	0.83 → 0.32 (61 %)	2.21 → 0.63 (71 %)	1.66 → 0.67 (60 %)	0.81 → 0.26 (68 %)	0.84 → 0.19 (77 %)
Aortic arch	1.02 → 0.39 (62 %)	2.08 → 0.75 (64 %)	1.58 → 0.11 (93 %)	0.35 → 0.12 (66 %)	0.87 → 0.69 (21 %)
2 cm above carina	1.04 → 0.53 (49 %)	2.07 → 0.98 (53 %)	1.59 → 0.27 (83 %)	0.3 → 0.3 (0 %)	0.80 → 0.53 (34 %)
1 cm below carina left main bronchus	0.54 → 0.4 (26 %)	1.16 → 0.4 (66 %)	1.04 → 0.41 (61 %)	0.31 → 0.13 (58 %)	0.53 → 0.34 (36 %)
1 cm below carina right main bronchus	0.52 → 0.29 (44 %)	1.33 → 0.65 (51 %)	1.55 → 0.37 (76 %)	0.54 → 0.49 (9 %)	0.64 → 0.56 (13 %)

Before arrow: cross sectional area in cm at end inspiration, after the arrow: cross sectional area at end expiration in cm, in brackets percentage airway lumen collapse between end-inspiratory and end-expiratory imaging