Table 1.
Breathing pattern and respiratory mechanics according to the underlying respiratory disease
| Variable | Restrictive diseases (n = 39) |
Obstructive diseases (n = 30) |
P |
|---|---|---|---|
| Breathing pattern | |||
| Respiratory rate (breath/min) | 25 (9) |
19 (5) |
0.001 |
| VT (ml) | 450 (379 to 625) |
497 (403 to 631) |
0.64 |
| Respiratory mechanics | |||
| CLdyn (l/cmH2O) | 0.05 (0.03 to 0.12) |
0.06 (0.04 to 0.09) |
0.38 |
| RL (cmH2O/lxs) | 5.7 (3.8 to 8.6) |
15.8 (10.1 to 19.8) |
<0.001 |
| PEEPdyn (cmH2O) | 0.8 (0.5 to 1.1) |
1.8 (1.2 to 3) |
<0.001 |
| PTPdi (cmH2Oxs) | 7.6 (5 to 13.8) |
13.4 (10.6 to 19.6) |
0.003 |
| PTPdi/min(cmH2Oxs/min) | 213 (129 to 271) |
283 (191 to 369) |
0.026 |
CLdyn, dynamic lung compliance; NIV, noninvasive mechanical ventilation; PEEPdyn, dynamic positive end-expiratory pressure; PTPdi, pressure-time product of diaphragmatic pressure per breath; PTPdi/min, pressure-time product of diaphragmatic pressure per minute; RL, pulmonary resistance at mid-inspiratory volume; VT, expired tidal volume. The median and interquartile ranges (IQRs) are reported for each variable except respiratory rate which did not deviate from the normal distribution, and for which the mean and standard deviation (SD) are reported. The P-values were computed by Wilcoxon's test, except for PS and respiratory rate for which the t-test was applied.