Table. 4—

4 Haemodynamic and gas exchange variables. Gas exchange results correspond to baseline ventilation.

Body posture
BAS semirecumbentPronePost-prone semirecumbent
Haemodynamic variables
 HR beats·min−1119±14113±13111±13
 MAP mmHg71±775±776±7
 CVP mmHg9±210±210±2
 MPAP mmHg27±428±428±4
 PAWP mmHg11±211±212±2
 CI L·min−1·m−24.3±0.64.4±0.74.6±01.0
 SVRI dynes·s·cm−5·m−21181±2421218±2781215±312
 PVRI dynes·s·cm−5·m−2293±50302±56300±68
VO2 mL·min−1·m−2142±22148±25145±24
 O2ER0.38±0.030.35±0.02#0.32±0.02#, +
 LVSWI g·m−129.4±3.333.2±4.335.7±6.6
Gas exchange
Pa,O2/Fi,O2 mmHg</emph>86±7133±13#128±13#
Pa,CO2 mmHg49.4±1.642.8±1.2#43.9±1.2#
 pHa7.33±0.027.40±0.01#7.39±0.01#
Pv,O2 mmHg36.2±1.841.5±1.7#43.2±2.1#
Sv,O2 %57±266±2#69±2#
Pv,CO2 mmHg55.4±1.648.1±1.3#49.4±1.3#
 pHv7.28±0.027.35±0.01#7.34±0.01#
 QS·QT−10.36±0.030.24±0.03#0.26±0.03#
Vd·Vt−10.48±0.060.33±0.08#0.35±0.07#
  • Data are presented as mean±sd. BAS: baseline; HR: heart rate; MAP: mean arterial pressure; CVP: central venous pressure; MPAP: mean pulmonary artery pressure; PAWP: pulmonary artery wedge pressure; CI: cardiac index; SVRI: systemic vascular resistance index; PVRI: pulmonary vascular resistance index; VO2: oxygen consumption; O2ER: oxygen extraction ratio; LVSWI: left ventricular stroke work index; Pa,O2: arterial oxygen tension; FI,O2: inspired oxygen fraction; Pa,CO2: carbon dioxide arterial tension; pHa: arterial pH; Pv,O2: mixed venous oxygen partial pressure; Sv,O2: mixed venous oxygen saturation; Pv,CO2: mixed venous carbon dioxide partial pressure; pHv: mixed venous pH; QS·QT−1: shunt fraction; Vd·Vt−1: physiological dead space. #: p<0.01 versus SRBAS; : p<0.05 versus pre-prone semirecumbent (SRBAS); +: p<0.05 versus prone. 1 mmHg = 0.133 kPa.