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Table 2

From: Effect of noninvasive ventilation on pulmonary gas exchange in chronic obstructive pulmonary disease

  HCO3 PaO2/FIO2 P(A-a)O2 PaO2/PAO2 Shunt
Initial 31.5 ± 5.0 238.2 ± 45.1 15.8 ± 12.9 0.770 ± 0.172 0.93 ± 0.75
Final 34.3 ± 6.4 257.7 ± 31.8 78.3 ± 26.3 0.534 ± 0.089 4.50 ± 1.40
P value 0.375* 0.368* 0.000** 0.007** 0.000**
  1. *insignificant, **significant with deterioration.