Measurements of different pressures, diaphragmatic displacement and maximal relaxation rate in different conditions
| Normal breathing | Sniff like manoeuvre | P value* | |
| Oesophageal pressure measurements | No breaths 280 | No breaths 242 | |
| Pesophageal (cmH2O) | −10.66±3.39 | −31.59±15.54 | <0.001 |
| Diaphragmatic displacement (cm) | 1.64±0.5 | 1.40±0.53 | 0.01 |
| Transdiaphragmatic recordings | No breaths 248 | No breaths 202 | |
| Pdi (cmH2O) | 21.10±5.89 | 34.95±8.93 | <0.001 |
| Diaphragmatic displacement (cm) | 1.73±0.61 | 1.40±0.42 | <0.001 |
| MRR measurements | No breaths 282 | No breaths 243 | |
| Pdi-MRR (cmH2O/s) | −82.65±21.30 | −131.13±36.02 | <0.001 |
| ECHO-MRR (cm/s) | 2.97±0.95 | 4.25±1.28 | <0.001 |
*Comparison was tested with Wilcoxon signed-rank test (paired samples) Pdi; MRR; ECHO: assess by M-mode ultrasonography.
MRR, maximal relaxation rate; Pdi, transdiaphragmatic pressure.