Fig. 2.

Changes from supine to prone position for the whole population, patients with early ARDS, and patients with persistent ARDS in V/Q mismatch (A), shunt (C), and dead space (E) at the global. Correlation between timing of ARDS onset with difference in ventilation–perfusion mismatch (B), shunt (D), and dead space (F) at the global. Transverse line: median. Each dot represents one patient: dark gray dots denote patients with early ARDS and light gray dots denote patients with persistent ARDS. The dotted line represents 95% confidence intervals, while the solid line represents regression line. V/Q ventilation–perfusion, ARDS acute respiratory distress syndrome