Abstract
The optimal mode of respiratory support for individuals with severe coronavirus disease 2019 (COVID-19) before invasive mechanical ventilation (IMV) is currently a subject of much debate. Recently published guidelines1 and a Comment2 differ substantially to other guidelines in this regard, with some advocating high flow nasal cannulae (HFNC) over non-invasive ventilation (NIV),1,2 or vice versa (NHS guidance). This debate is understandable given the paucity of data and need for rapid generation of guidance, but it is a cause of confusion among respiratory physicians.
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