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Table 2 Gase exchange

From: Effect of average volume-assured pressure support treatment on health-related quality of life in COPD patients with chronic hypercapnic respiratory failure: a randomized trial

VariablesPatients treated with AVAPSControl groupTreatment Effect (95% CI)
6 months–baseline
P- Value
BaselineAfter 6 monthBaselineAfter 6 month
Pa CO2 mm Hg54.8 ± 3.546.6 ± 3.154.5 ± 3.348.3 ± 3.90.6 (−0.3 to 0.9)0.001*
PaO2 mm Hg50.7 ± 2.159.6 ± 2.350.9 ± 2.557.7 ± 3.20.6(−0.67 to 0.560.001*
HCO3, mmol/L34.2 ± 3.129.5 ± 2.134.9 ± 3.230.6 ± 2.90.4(−1.4 to 1.6)0.001*
  1. Data are shown as mean ± SD. A positive mean difference means an increase from baseline to 6 months for AVAPS compared with control group. HCO3 = bicarbonate; PaCO2, partial arterial carbon dioxide pressure; PaO2, partial arterial oxygen pressure