Table 1– Respiratory function, blood gases (room air) and noninvasive ventilation (NIV) settings of patients with obesity hypoventilation syndrome
VC L3.2±1
VC % pred88±23
FEV1 L2.4±0.8
FEV1 % pred83±25
FEV1/VC79.3±8.6
FEV1/FVC % pred94.3±1.1
Arterial blood gases
 pH7.40±0.03
 Pa,O2 kPa10±1.7
 Pa,CO2 kPa5.9±0.8
 HCO3- mmol·L−127±1.7
 Sa,O2 %95±1.7
NIV settings
 Back-up rate cycles·min−113±2
 IPAP cmH2O19±2
 EPAP cmH2O11±2

  • Data are presented as mean±sd. VC: vital capacity; % pred: % predicted; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; Pa,O2: arterial oxygen tension; Pa,CO2: arterial carbon dioxide tension; HCO3-: bicarbonate; Sa,O2: arterial oxygen saturation; IPAP: inspiratory positive airway pressure; EPAP: expiratory positive airway pressure.