Table 2.
Subject backgrounds
| Total | Success | Failure | p value | |
|---|---|---|---|---|
| n = 173 | n = 162 | n = 11 | ||
| Sex, n (%) | ||||
| Male | 114 (65.9) | 107 (66.1) | 7 (63.6) | 0.553 |
| Female | 59 (34.1) | 55 (34.0) | 4 (36.4) | 0.696 |
| Age (mean ± SD) | 68.2 ± 12.8 | 68.2 ± 12.9 | 69.3 ± 11.7 | 0.854 |
| Surgery, n (%) | 170 (98.3) | 160 (98.8) | 10 (90.9) | 0.179 |
| Cardiac | 90 (52.0) | 86 (53.1) | 4 (36.4) | 0.519 |
| Craniocervical | 34 (19.7) | 34 (21.0) | 0 (0.0) | 0.215 |
| Gastrointestinal | 16 (9.2) | 13 (8.0) | 3 (27.3) | 0.064 |
| Vascular | 14 (8.1) | 11 (6.8) | 3 (27.3) | 0.031 |
| Other surgery | 16 (9.2) | 16 (9.9) | 0 (0.0) | 0.601 |
| Others, n (%) | 3 (1.7) | 2 (1.2) | 1 (9.1) | 0.989 |
| Emergency surgery, n (%) | 14 (8.1) | 13 (8.0) | 1 (9.1) | 0.616 |
| Ventilation period, min (mean ± SD) | 1694 ± 3058 | 1651 ± 3011 | 2330 ± 3797 | 0.516 |
| SBT times (median ± SD) | 1 ± 1.8 | 1 ± 1.7 | 2 ± 2.9 | 0.158 |
| WOB*, J/L (mean ± SD) | 0.77 ± 0.27 | 0.76 ± 0.26 | 0.99 ± 0.41 | 0.015 |
| HFNC, n (%) | 123 (71.1) | 112 (69.1) | 11 (100) | 0.026 |
| NPPV, n (%) | 3 (1.7) | 0 (0.0) | 3 (27.3) | 0.0002 |
The Mann-Whitney U test and Fischer’s exact test were applied. *WOB is a calculated estimate
SBT spontaneous breathing trial, WOB work of breathing, HFNC high-flow nasal cannula, NPPV non-invasive positive-pressure ventilation