Article Figures & Data
Figures
- Fig. 1.
Method of drawing the regions of interest to measure the lung density on a bedside digitized chest x-ray in a representative subject in the present study. The initial images (upper panels) and the corresponding contoured images (lower panels) were obtained at PEEP of 5 cm H2O (left panels) and 15 cm H2O (right panels), respectively. Four regions of interest were manually drawn on the right lung, and 3 regions of interest on the left lung for each PEEP condition. The arithmetic mean of the density measured in the 7 regions of interest at PEEP 15 cm H2O divided by that obtained at PEEP 5 cm H2O was 0.89 in this case. RR = right lung. LL = left lung.
- Fig. 2.
Box-and-whiskers plots of lung density at PEEP 15 cm H2O to lung density at PEEP 5 cm H2O ratios (rP15/P5) across the lung levels according to Figure 1 for right and left lung. No significant difference was obtained across the lung levels for rP15/P5.
- Fig. 3.
Relationship between the recruited volume and the arithmetic mean of the ratios of lung density at PEEP 15 cm H2O to lung density at PEEP 5 cm H2O (μP15/P5) over all regions of interest. The solid line is the regression line across the data points. The horizontal dotted line indicates the threshold to define recruiters (recruited volume above 150 mL). The vertical dashed line is drawn from μP15/P5 equal to 1, indicating no change in lung density with the higher PEEP.
- Fig. 4.
Relationships of changes in PaO2 (upper panel) and in dynamic compliance of the respiratory system (Cdyn,rs) (lower panel) to the arithmetic mean of the ratios of lung density at PEEP 15 cm H2O to lung density at PEEP 5 cm H2O over all regions of interest (μP15/P5) between PEEP 15 cm H2O and PEEP 5 cm H2O. The lines are the regression lines.
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