Table 1—

Baseline demographic and respiratory function data

s-NIMVNIMV
Age yrs67±767±8
Sex F:M3:155:13
BMI kg·m−225.1±424.9±4
pH7.39±0.027.39±0.02
Pa,CO2 kPa7.36±0.677.57±0.80
Pa,O2 kPa6.56±0.806.02±0.93
HCO3 mEq·L−131.9±1.931.3±1.7
FEV1 L0.814±0.210.719±0.20
FVC L2.24±0.72.11±0.8
FEF25–75% L·s−10.25±0.080.21±0.8
  • NIMV: noninvasive mechanical ventilation

  • s-NIMV: sham NIMV

  • F: female

  • M: male

  • BMI: body mass index

  • Pa,CO2: arterial carbon dioxide tension

  • Pa,O2: arterial oxygen tension

  • HCO3: serum bicarbonate

  • FEV1: forced expiratory volume in one second

  • FVC: forced vital capacity

  • FEF25–75%: forced mid-expiratory flow

  • None of the differences were statistically significant