Table 3– Respiratory mechanics
ParameterSBLi-NPPVHi-NPPVp-value
SB versus Li-NPPVSB versus Hi-NPPVLi-NPPV versus Hi-NPPV
Ppl cmH2O-15.1±6.8-6.73±7.9-2.05±7.52<0.001<0.001<0.001
Pdi cmH2O17.9±8.19.09±2.42.83±4.6<0.001<0.001<0.01
PTPdi cmH2O·s14.9±7.56.3±5.91.6±2.6<0.001<0.001<0.01
PTPdi/min cmH2O·s·min−1323±149132±13940±69<0.001<0.001<0.01
CL,dyn L·cmH2O−10.02±0.0140.03±0.0070.03±0.009nsnsns
RL cmH2O·s·L−122.3±14.611.0±8.411.9±9.7<0.01<0.05ns
  • Data are presented as mean±sd, unless otherwise stated. SB: spontaneous breathing; Li: low-intensity; NPPV: noninvasive positive pressure ventilation; Hi: high-intensity; Ppl: pleural pressure; Pdi: transdiaphragmatic pressure; PTPdi: pressure–time product of the diaphragm; PTPdi/min: PTPdi per minute; CL,dyn: dynamic lung compliance; RL: pulmonary resistance; ns: nonsignificant.