Fig. 1From: Limitations of the ARDS criteria during high-flow oxygen or non-invasive ventilation: evidence from critically ill COVID-19 patientsChange in PO2/FIO2 after a change in respiratory support in 148 critically ill COVID-19 patients grouped by ARDS severity during mechanical ventilation (MV) based on the Berlin definition. A HFNC to MV. B NIV to MV. C MV to HFNC. D MV to NIVBack to article page