The goal of this observational study is to assess the potential non-invasive tools (e.g. regional ventilation, respiratory muscle response, lung mechanic's parameters) to identify the risk of failure when using high flow nasal cannula (HFNC) or non-invasive ventilation (NIV). The main question, it aims to answer is: Does abnormal regional ventilation could predict HFNC or NIV failure?
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Difference in regional ventilation distribution (%)
Timeframe: The parameter is measured at the time of enrolment. Failure of HFNC or NIV is adjudicated at 7 days.