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Resistance (Rn) (A, B), tissue damping (G) (C, D), and tissue elastance (H) (E, F) at baseline (0 min) and after 30 min of mechanical ventilation with different tidal volumes without (A, C, E) and with addition of PEEP (B, D, F). *: P < 0.05 vs baseline. +: P < 0.05 vs all other groups. Mean values ± SEM.
