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Table 1 Distribution of tidal ventilation, tidal recruitment gas and nonaerated lung tissue in apical slice

From: Spontaneous breathing with airway pressure release ventilation favors ventilation in dependent lung regions and counters cyclic alveolar collapse in oleic-acid-induced lung injury: a randomized controlled computed tomography trial

Region Mode Tidal ventilation (% of tidal volume) Tidal recruitment (% of total lung volume) Gas volume (% of contained gas) Nonaerated lung tissue (% of total lung volume)
Nondependent SB- 46 ± 13 0.1 ± 0.2 56 ± 12 0.3 ± 0.6
  SB+ 33 ± 31 0.0 ± 0.2 56 ± 6 0.4 ± 0.7
Dependent SB- 54 ± 13 1.7 ± 1.9 44 ± 12 13.8 ± 14.1
  SB+ 67 ± 31 0.5 ± 1.7 44 ± 6 8.6 ± 12.3
Interaction, region × ventilatory mode   ns ns ns ns
  1. Dependent and nondependent region of interest on transverse computed tomography scan (see Figure 1, center for details). SB-, airway pressure release ventilation without spontaneous breathing; SB+, airway pressure release ventilation with spontaneous breathing; ns, not significant.