Table 1

Clinical variables at baseline and at 3-month follow-up

AVAPSFixed-level PS
BaselineFollow-upp ValueBaselineFollow-upp Value
Age (years)53±956±11
Gender (male/female)12/1311/14
Emergency/elective presentation9/169/16
BMI (kg/m2)50±848±90.00752±851±70.024
Fat-free mass (kg)69±1768±180.49372±1871±180.870
Waist circumference (cm)141±18136±170.006145±14146±140.120
Neck circumference (cm)46±646±70.34048±548±70.084
FEV1 (% predicted)53±1559±140.03955±1560±160.222
FVC (% predicted)52±1458±130.01956±1562±180.189
PaCO2 (kPa)7.0±0.76.4±0.80.0046.8±0.86.2±0.80.021
PaO2 (kPa)8.9±1.29.1±1.20.6608.7±1.89.3±1.20.163
HCO3 (mmol/litre)31±329±30.00131±427±30.003
  • The p values refer to paired t test analysis from initiation to follow-up values within each group.

  • AVAPS, average-volume-assured pressure support; BMI, body mass index; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; HCO3, arterial concentration of bicarbonate; PaCO2, arterial partial pressure of carbon dioxide; PaO2, arterial partial pressure of oxygen; PS, pressure support.