Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Percentage distribution in the different severity classes before and after institution of IMV for patients on HFNO (top) and NIV (bottom). See text for more details. HFNO = high-flow nasal oxygen; IMV = invasive mechanical ventilation; NIV = noninvasive ventilation; P/F = PaO2/FIO2 ratio.
