Criteria | Values |
Blood gases | pH <7.25; |
Paco2 >8–9.3 kPa (60–70 mm Hg) | |
Inspired oxygen (Fio2) | Fio2 >0.6–0.7 for saturation >92% |
Frequent desaturations | |
SNIPPV support | >26/8 cm H2O airway pressures |
>19 SIMV rate | |
Apnoea/bradycardia/desaturations | Severe, recurrent apnoea requiring bag and mask ventilation |
Fio2, fractional inspired oxygen; Paco2,partial pressure of carbon dioxide; SIMV, synchronous intermittent mandatory ventilation.