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

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

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

Data are expressed in mean (standard deviation)
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

ISSN: 1471-2466