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

Table 2 Wash out period: pulmonary function tests and polygraphy

PFT and Polygraphy (during withdrawal)	n = 15
FEV1/FVC (%)	79.5 ± 7.4
FEV1 (%)	69.2 ± 16.4
FVC (%)	70.2 ± 17.3
AHI (n/h)	53.5 ± 26.9
RT < 90% (%)	21.8 ± 24.2
ODI ≥ 4% (n/h)	42.1 ± 39.5

Data are expressed in mean ± standard deviation
Definition of abbreviations: PFT pulmonary function test, FEV1 forced expiratory volume in 1 s, FVC forced vital capacity, AHI apnea hypopnea index, RT < 90% percentage of recording time below 90% saturation, ODI oxygen desaturation index

ISSN: 1471-2466