Table 5.
Clinical criteria
| Moderate to severe respiratory distress |
| Tachypnea (respiratory rate >25/min) |
| Accessory muscle use or abdominal paradox |
| Blood gas derangement pH < 7.35, PaCO2> 45 mmHg |
| PaO2/FiO2< 300 or SpO2< 92% with FiO2 0.5 |
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