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Table 1 Contraindication of noninvasive positive pressure ventilation

From: High-flow nasal cannula oxygen therapy in adults

1. Consciousness disorder
a. No response
b. Agitated
c. Uncooperative
2. Claustrophobia
3. Airway obstruction
4. Facial injury, facial malformation
5. A lot of sputum
6. Risk of aspiration
7. Unstable hemodynamics
a. Shock
b. Intractable arrhythmia
c. Post-CPR
8. Respiratory arrest