PMC5853159_01
Mechanical ventilation and oxygenation before, during, and after prone positioning
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Fig1
After PEEP was increased from 8 to 10 cmH2O, dynamic imaging of EIT showed no improvement in the distribution of ventilation, and PaO2/FIO2 progressively decreased to less than 150 mmHg (Fig. 1). On day 7, PEEP was incrementally decreased to 7 cmH2O and the patient was successfully weaned from mechanical ventilation (Fig. 1).
Impedance waveform, tidal images (TID), center of ventilation (COV), change of end-expiratory lung impedance against reference (dEELI), and global inhomogeneity index (GI) before, during, and after prone positioning. In TID, the white area indicates being maximally ventilated. In dEELI, orange or blue color indicates the decrease or increase of impedance value compared to the reference (supine, plateau pressure of 21 cmH2O), respectively. Ventral shift of ventilation was unexpectedly observed during prone positioning
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Fig2
The tidal images of ventilation distribution (TID) before, during, and after prone positioning are presented in Fig. 2. COV (presented as CG in Fig. 2) describes the distribution of tidal ventilation along the gravitational axis. Figure 2 shows the results of the analysis.