| Contraindication |
---|---|
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 |