
Prone positioning is widely used in mechanically ventilated patients with COVID-19; however, the specific clinical scenario in which the individual is most poised to benefit is not fully established. A retrospective observational study from two tertiary care centres, including mechanically ventilated patients for COVID-19, reported improvement in oxygenation as measured by PaO2/FiO2. On average, PaO2/FiO2 improved by 19% immediately after returning to the supine position. Prone episodes were more successful if the pre-prone PaO2/FiO2 was lower and the patient was on inhaled epoprostenol (iEpo). For individuals with severe acute respiratory distress syndrome (ARDS) and on iEpo, the median improvement in PaO2/FiO2 was 27% in both instances. Prone positioning in mechanically ventilated patients with COVID-19 is generally associated with sustained improvements in oxygenation, and is more impactful in those who are more severely hypoxemic before prone positioning.
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