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Table 1 Respiratory parameters and blood gas analysis at inclusiona

From: PaCO2 and alveolar dead space are more relevant than PaO2/FiO2 ratio in monitoring the respiratory response to prone position in ARDS patients: a physiological study

Parameters Median 1st to 3rd interquartile range
LIS 3.25 3 to 3.25
Tidal volume, mL/kg IDB 6.2 5.6 to 8.3
RR, breaths/minute 22 18 to 26
PEEP, cmH2O 6 5 to 7
FiO2, % 90 90 to 100
Pplat, cmH2O 27 26 to 28
PaO2/FiO2, mmHg 70 51 to 77
PaCO2, mmHg 58 52 to 60
Crs, mL/cmH2O 16 13 to 30
VDalv/VT 0.42 0.35 to 0.47
VDalv, mL 159 95 to 236
  1. aCrs: compliance of the respiratory system; IDB: ideal body weight; LIS: lung injury score [32]; PaCO2: partial pressure of arterial CO2; PaO2/FiO2: ratio of partial pressure of arterial O2 to fraction of inspired O2; PEEP: positive end-expiratory pressure; Pplat: plateau pressure; RR: respiratory rate; VDalv/VT: ratio of alveolar dead space to tidal volume.