2.5 Heavy group diagnostic criteria
Patients presented with general group diagnostic criteria and any one of
the following:
- Respiratory rate ≥ 30/min at rest.
- Oxygen saturation (SpO2) ≤ 93% on room air.
- Arterial oxygen partial pressure (PaO2)/oxygen uptake
concentration (FiO2)
[PaO2/FiO2] (PF ratio) ≤ 300.