Table. 2—

2 Variables reflecting dynamic hyperinflation, and oesophageal and gastric pressures and their changes

Pre-prone semirecumbentPronePost-prone semirecumbent
ΔFRC L#0.34±0.130.31±0.150.27±0.12
PEEPtot,RS cmH2O#11.3±1.510.4±1.710.1±1.5
PEEPtot,cw cmH2O#2.8±0.43.3±0.72.6±0.4
Poes at Vr cmH2O12.6±3.18.6±3.612.4±3.0
Pga at Vr cmH2O9.6±3.712.9±3.910.1±3.5
ΔPmax,ga at 0.6 L VT cmH2O#3.7±1.14.2±1.33.9±1.1
ΔPmax,ga at 1.0 L VT cmH2O5.6±1.96.0±2.45.9±2.0
ΔP2,ga at 0.6 L VT cmH2O#3.3±0.93.9±1.13.6±1.0
ΔP2,ga at 1.0 L VT cmH2O5.3±1.55.7±1.95.5±1.6
Mean maximal amplitude in Poes cmH2O2.0±1.21.7±1.02.1±1.3
Mean rise rate in Poes cmH2O·s−1¶12.5±5.211.4±4.712.8±5.3
  • Data are presented as mean±sd. ΔFRC: change in functional residual capacity; PEEPtot: total positive end-expiratory pressure; RS: respiratory system; cw: chest wall; Poes: oesophageal pressure; Vr: respiratory system relaxation volume; Pga: gastric pressure; ΔPmax,ga: difference between maximal Pga and Pga at Vr; VT: tidal volume; ΔP2,ga: difference between plateau Pga and Pga at Vr. #: values correspond to baseline ventilation conditions; : for each study posture, reported values are mean±sd of determined values during all sets of test breaths (see also fig. 1).