Table 4– Blood gas parameters
ParameterSBLi-NPPVHi-NPPVp-value
SB versus Li-NPPVSB versus Hi-NPPVLi-NPPV versus Hi-NPPV
pH7.38±0.037.4±0.037.42±0.03<0.05<0.001<0.01
Pa,CO2 mmHg59.3±7.555.2±6.949.4±7.8<0.001<0.001<0.01
Pa,O2 mmHg67.8±7.165.8±11.971.6±19.1nsnsns
HCO3- mmol·L−130.8±2.930.7±2.230.7±2.4nsnsns
BE mmol·L−18.3±3.18.0±2.77.6±2.9nsnsns
FI,O2 %24.2±2.524.3±2.624.3±2.7nsnsns
  • Data are presented as mean±sd, unless otherwise stated. SB: spontaneous breathing; Li: low-intensity; NPPV: noninvasive positive pressure ventilation; Hi: high-intensity; Pa,CO2: arterial carbon dioxide tension; Pa,O2: arterial oxygen tension; BE: base excess; FI,O2: inspiratory oxygen fraction; ns: nonsignificant.