Table. 3—

Absolute and relative contraindications for noninvasive positive pressure ventilation(NPPV) trial

Contraindications for NPPV trial
Absolute contraindications
    Need for immediate endotracheal intubation
    Decreased level of consciousness
    Excess respiratory secretions and risk of aspiration
    Past facial surgery precluding mask fitting
Relative contraindications
    Haemodynamic instability
    Severe hypoxia and/or hypercapnia, Pa,O2/FI,O2 ratio of <200 mmHg, Pa,CO2>60 mmHg
    Poor patient cooperation
    Severe agitation
    Lack of trained or experienced staff
  • Pa,O2: arterial oxygen tension; Pa,CO2: arterial carbon dioxide tension; FI,O2: inspiratory oxygen fraction.