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Table 4 Measured data with NIV and one month after the switch to CPAP

From: Switch of noninvasive ventilation (NIV) to continuous positive airway pressure (CPAP) in patients with obesity hypoventilation syndrome: a pilot study

Measured data NIV CPAP P value
Pa CO2 (mm Hg) 40.4 ± 5.1 40.9 ± 6.7 0.323
Pa O2 (mm Hg) 73.3 ± 8.8 74.4 ± 8.8 0.235
pH 7.43 ± 0.04 7.43 ± 0.03 0.508
HCO3‾ (mmol/L) 26.3 ± 3.14 26.6 ± 3.6 0.511
RT < 90% (%) 28.1 ± 27.2 20.5 ± 25.2 0.218
ODI ≥ 4% (n/h) 11.92 ± 17.31 10 ± 9.41 0.285
Transcutaneous pCO2 (mm Hg) 49.9 ± 10.12 48.4 ± 5.14 0.534
AHI (n/h) 5.99 ± 10.96 5.49 ± 7.84 0.334
Leaks (L/sec) 3.8 ± 10.09 2.9 ± 6.1 0.844
Compliance (h) 6.73 ± 2.66 6.8 ± 2.27 0.766
  1. Data are expressed in mean (standard deviation)
  2. Definition of abbreviation: NIV non invasive ventilation, CPAP continuous positive airway pressure, RT < 90% percentage of recording time below 90% saturation, ODI oxygen desaturation index, AHI apnea hypopnea index