Table 1

Data on admission of chronic obstructive pulmonary disease patients in acute respiratory failure treated with iron lung ventilation (ILV) or invasive mechanical ventilation (IMV)

ILVIMVp‐value
Patients n2222
M/F19/313/9
Age yrs72.2±6.174.5±7.50.259
Weight kg67.7±13.968.1±16.20.93
Height cm164.0±8.6164.0±6.91
FEV1 % pred#33.7±13.535.0±8.70.741
VC % pred#61.1±12.957.5±9.30.294
FEV1/VC#41.0±14.546.1±11.40.246
MRC dyspnoea scale3 (2–4)3.5 (2.0–4.0)0.711
Glasgow Coma Score+14 (3–15)12 (7–15)0.121
SAPS II§32 (17–42)35 (20–47)0.194
Pa,O2/FI,O2192.0±59.8172.0±61.70.277
Pa,CO2 kPa12.8±2.113.3±2.40.531
pH7.20±0.047.20±0.040.455
HCO3 mM36.2±4.837.4±8.20.663
  • Data are presented as mean±sd or median (range) unless otherwise stated

  • M: male

  • F: female

  • FEV1: forced expiratory volume in one second

  • VC: vital capacity

  • MRC: Medical Research Council

  • SAPS: simplified acute physiology score

  • Pa,O2: arterial oxygen tension

  • FI,O2: inspiratory oxygen fraction

  • Pa,CO2: arterial carbon dioxide tension

  • #: functional measurements were obtained in stable conditions 1–12 months before or after the acute exacerbations

  • : from 16

  • +: from 17

  • §: from 18