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Table 2 Arterial blood gas, lung mechanics and volumetric capnography data during the first PP session

From: Duration of prone position sessions: a prospective cohort study

ParametersBefore PP2 h after PPBefore SP2 h after SP
pH7.26 ± 0.17.29 ± 0.1a7.35 ± 0.1a7.34 ± 0.1a
PaO2 (mmHg)77 ± 3299 ± 60a83 ± 23a79 ± 23
PaCO2 (mmHg)54 ± 1351 ± 15a46 ± 11a46 ± 13a
Bicarbonates (mmol/L)23.9 ± 5.423.5 ± 5.6a25 ± 5.9a24.3 ± 5.4
SaO2 (%)94 ± 396 ± 2a97 ± 2a96 ± 3a
RR (cycles/min)24 ± 625 ± 6a26 ± 6a26 ± 6a
VTe (mL/kg PBW)7 ± 1.57.1 ± 1.97.2 ± 1.97.1 ± 1.7
FiO2 (%)65 ± 2254 ± 19a39 ± 14a46 ± 17a
Pplat (cmH2O)29 ± 428 ± 427 ± 3a27 ± 4
PEEPtot (cmH2O)16 ± 316 ± 315 ± 316 ± 3
Cstat (mL/cmH2O)39 ± 1640 ± 1544 ± 18a45 ± 19a
PaO2/FiO2129 ± 52189 ± 79a237 ± 92a192 ± 79a
ΔP (cmH2O)12.7 ± 412.3 ± 3.911.6 ± 3.8a11.6 ± 4.3
SIII (%CO2/L)9.28 ± 6.838.74 ± 8.510.1 ± 20.57.05 ± 5.18a
PetCO2 (mmHg)41 ± 939 ± 8a37 ± 8a35 ± 7a
VCO2-min (mL/min)226 ± 71232 ± 64227 ± 64225 ± 62
VD/VT-phy (%)36.6 ± 8.535.9 ± 7.934.9 ± 833.5–8a
P(a-et)CO2/PaCO2 (%)22 ± 16.520.7 ± 15.319.5 ± 15.1a20.4 ± 17.8
VE/VCO2-min66.5 ± 13249.2 ± 1367.8 ± 161a61.2 ± 94.9a
  1. Values are expressed with mean ± SD
  2. RR respiratory rate, Cstat static compliance, ΔP driving pressure, SIII phase 3 slope of volumetric capnography, VE minute ventilation
  3. ap < 0.05 compared to baseline value (before PP)