Age <55 years |
ABO compatibility |
Clear chest radiograph |
PaO2 >40 kPa (FiO2 100% and 5 cmH2O PEEP) |
Smoking history <20 pack years |
Absence of chest trauma |
No evidence of aspiration or sepsis |
No prior cardiopulmonary surgery |
Absence of organisms on sputum Gram stain |
Absence of purulent secretions at bronchoscopy |