Mechanisms of oxygenation responses to proning and recruitment in COVID-19 pneumonia.

Although the differences in PaO 2 /FiO 2 and Q VA /Q, between supine-5 and prone-5, did not reach statistical significance (see Table 2 ), their changes when going from supine to prone position were independently correlated both with the changes of the non-aerated tissues (i.e., the balance between “old” dorsal atelectasis, which disappeared, and “new” ventral atelectasis, which appeared) and with the changes of its apparent perfusion ratios (see Fig.

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