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.