patients with acute respiratory failure related to suspected community acquired pneumonia (viral and non viral) requiring oxygen therapy \< 6 L/min (or FiO2\< 0.50) (to maintain SpO2 between 90 and 94% SpO2) without criteria for immediate intubation or ICU transfer.
Patients hospital admission \< 72 hours
You may not be if
shock state,
no SpO2 signal available,
patient agitation,
pH \< 7.30 (if blood gas available)
PaCO2 \> 50 mmHg, (if blood gas available) or chronic hypercapnia history
Non invasive respiratory support (NIV, High flow Nasal Therapy (HFNT)) at study inclusion
Withdrawal of life support or palliation as the goal of care
patients' or next of kin refusal to participate to the study
