Table 1—

Clinical and physiological characteristics of the patients studied. There were no significant differences between the two groups.

Supported dischange groupControl group
Subjects n105100
Age yrs70 (44–87)66 (39–88)
Pa,O2 mmHg57.1 (32–100)56.7 (30–88)
Pa,CO2 mmHg46.8 (23–90.7)43.5 (23–81.9)
Arterial pH7.39 (7.24–7.51)7.40 (7.170–7.54)
FEV1 % ref45 (20–76)46 (15–73)
  • Arterial blood gases were obtained at the emergency room, breathing room air. Spirometry was obtained at discharge from hospital

  • Pa,O2: arterial oxygen tension

  • Pa,CO2: arterial carbon dioxide tension

  • FEV1: forced expiratory volume in one second (reference values were those of a Mediterranean population 8)