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

Table 6 NIV failure predictor factors

Clinical characteristics	NIV failure (n = 8)	NIV success (n = 7)	P values
Age (years)	67.12 ± 8.64	70.71 ± 14.04	0.555
BMI (kg/m²)	46.54 ± 4.84	36.2 ± 5.07	0.014*
Neck circumference (cm)	45.12 ± 5.64	41.93 ± 1.97	0.179
Waist/Hip ratio	0.94 ± 0.08	0.97 ± 0.09	0.448
paCO2 at diagnosis (mm Hg)	57.12 ± 8.56	58.29 ± 6.97	0.780
Cardiovascular comorbidities	7 (87.5%)	6 (85.7%)	1
FVC (%)	68.07 ± 19.46	70.49 ± 13.48	0.788
AHI (n/h)	63.09 ± 28.53	42.54 21.76	0.145
RT < 90% (%)	26.45 ± 28.55	16.54 ± 18.89	0.450
Diagnosis during an exacerbation	6 (75%)	6 (85.7%)	0.605

Data are expressed in n (%); mean (standard deviation)
Definition of abbreviations: NIV non invasive ventilation, BMI body mass index, FVC forced vital capacity, AHI apnea hypopnea index, RT < 90% % of recording time below 90% saturation

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