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Changes in regional compliance in patients without (left) and patients with (right) lung disorders. During pressure-controlled ventilation with constant driving pressure, the tidal impedance change per pixel can be regarded as regional compliance change per pixel. The open triangle represents the dependent lung region and the open circle represents the non-dependent lung region at the different used PEEP levels. Data are presented as mean and SEM. Significance: * P <0.05; ** P <0.01.
