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. 2024 Feb 21;19(2):e0299199. doi: 10.1371/journal.pone.0299199

Fig 2. Plots of global EIT-variables at supine baseline, during prone positioning and after supine repositioning.

Fig 2

Individual values and medians at each time point. A. Tidal impedance variation (TIV) relative to T1 (reference value 100 AU). B. Center of ventilation (CoV). At CoV = 50%, the gravitation point of the ventilation is at the center of the chest diameter. A higher number indicates a ventral over-weight whereas a lower number indicates a dorsal over-weight of the ventilation distribution. C. Delta end-expiratory lung impedance (dEELI) relative to T1 (reference value 0). D. Global inhomogeneity (GI) index. A higher value indicates a more heterogenous spatial distribution of ventilation across the lung. dEELI at T3 was higher than dEELI at T1, median difference 1.51 (95% CI 0.19–5.16, p = 0.04). T1-4: predefined data collection timepoints. T1, Supine baseline. T2, 30 min after prone positioning. T3, 60 min after prone positioning. T4, 30 min after supine repositioning.