The investigators evaluate the effects of High-flow nasal cannula (HFNC) in association with prone in patients with Covid-19 severe ARF.~All patients with ARF related to Covid-19 and admitted to the ICU are turned in prone position whenever tolerated, while receiving oxygenation with HFNC.~Outcomes of interest are the rate of success or failure (defined as the need for intubation and mechanical ventilation)
The investigators evaluate the effects of High-flow nasal cannula (HFNC) in association with prone in patients with Covid-19 severe ARF.