Table 2 Airway stenosis and interventional techniques characteristics
Characteristic | All (n = 119) | Successful (n = 75) | Unsuccessful (n = 44) | P value |
|---|---|---|---|---|
Etiology | 0.057 | |||
 Tracheal intubation or tracheostomy | 60 (50.4) | 34 (45.4) | 26 (59.1) |  |
 Surgery | 16 (13.4) | 10 (13.3) | 6 (13.6) |  |
 Trauma | 2 (1.7) | 1 (1.3) | 1 (2.3) |  |
 TB | 32 (26.9) | 26 (34.7) | 6 (13.6) |  |
 Radiation | 2 (1.7) | 0 | 2 (4.6) |  |
 Unknown | 7 (5.9) | 4 (5.3) | 3 (6.8) |  |
Stenosis degree | 0.663 | |||
 II | 33 (27.7) | 20 (26.7) | 13 (29.6) |  |
 III | 73 (61.3) | 48 (64.0) | 25 (56.8) |  |
 IV | 13 (10.9) | 7 (9.3) | 6 (13.6) |  |
Location | ||||
 Subglottis | 32 (26.9) | 10 (13.3) | 22 (50.0) | < 0.001* |
 Trachea | 47 (39.5) | 33 (44.0) | 14 (31.8) | 0.189 |
 Right main bronchus | 16 (13.4) | 11 (14.7) | 5 (11.4) | 0.610 |
 Left main bronchus | 29 (24.4) | 22 (29.3) | 7 (15.9) | 0.100 |
 Intermediate bronchus | 4 (3.4) | 3 (4.0) | 1 (2.3) | 1.000 |
Multilocation | 0.466 | |||
 Yes | 8 (6.7) | 4 (5.3) | 4 (9.1) |  |
 No | 111 (93.3) | 71 (94.7) | 40 (90.9) |  |
Length | 0.366 | |||
 < 1 cm | 5 (4.8) | 4 (6.1) | 1 (2.6) |  |
 1–3 cm | 69 (66.3) | 46 (69.7) | 23 (60.5) |  |
 ≥ 3 cm | 30 (28.9) | 16 (24.2) | 14 (36.8) |  |
Electrocautery | 0 (0, 1) | 0 (0, 1) | 1 (0, 2) | 0.089 |
Laser | 0 (0, 0) | 0 (0, 0) | 0 (0, 1) | 0.006* |
Mechanical dilation | 8 (4, 17) | 8 (4, 17) | 7 (4, 14) | 0.602 |
Cryotherapy | 4 (2, 7) | 4 (2, 7) | 4 (2, 8) | 0.820 |
Diprospan injection | 1 (0, 3) | 1 (0, 3) | 1 (0, 2) | 0.413 |
Stent | < 0.001* | |||
 Yes | 23 (19.3) | 7 (9.3) | 16 (36.4) |  |
 No | 96 (80.7) | 68 (90.7) | 28 (63.6) |  |
T-tube | 0.010* | |||
 Yes | 7 (5.9) | 1 (1.3) | 6 (13.6) |  |
 No | 112 (94.1) | 74 (98.7) | 38 (86.4) |  |
Antibiotics | 0.526 | |||
 Yes | 55 (46.2) | 33 (44.0) | 22 (50.0) |  |
 No | 64 (53.8) | 42 (56.0) | 22 (50.0) |  |
Time to intervention (days) from diagnosis | 22 (7, 72) | 22 (8, 63) | 28 (7, 92) | 0.884 |
Previous interventional treatment | 0.022* | |||
 Yes | 34 (28.6) | 16 (21.3) | 18 (40.9) |  |
 No | 85 (71.4) | 59 (78.7) | 26 (59.1) |  |
Number of procedures per year | 1 (0.5, 1.7) | 0.8 (0.4, 1.2) | 1.5 (0.8, 2.6) | < 0.001* |
Interval to second procedure (days) | 21 (9, 342) | 21 (9, 269) | 25 (9, 400) | 0.934 |
Stenosis degree change after first intervention (%) | 45 (30, 60) | 40 (20, 60) | 50 (38, 70) | 0.140 |