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Table 2 Regional densitometries at end-expiration: apical and diaphragmatic 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 Hyperinflation (%) Normal aeration (%) Poor aeration (%) No aeration (%) Interaction, HU range × ventilatory mode
Apex       
   Nondependent SB- 0 ± 0 73 ± 17 26 ± 17 1 ± 1 P < 0.01
  SB+ 0 ± 0 85 ± 11 15 ± 11 0 ± 1  
   Dependent SB- 0 ± 0 33 ± 19 50 ± 14 17 ± 18 ns
  SB+ 0 ± 0 48 ± 33 35 ± 21 16 ± 23  
Diaphragm       
   Nondependent SB- 0 ± 0 73 ± 23 25 ± 19 2 ± 5 P < 0.01
  SB+ 0 ± 0 88 ± 11 12 ± 11 0 ± 0  
   Dependent SB- 0 ± 0 9 ± 9 43 ± 15 47 ± 20 P < 0.001
  SB+ 0 ± 0 25 ± 15 52 ± 14 23 ± 22  
  1. Data presented as mean ± standard deviation. Amount of hyperinflated, normally aerated, poorly aerated and nonaerated tissue (% of total lung volume) in dependent and nondependent regions of interest on transverse computed tomography scans (see Figure 1 for details). SB-, airway pressure release ventilation without spontaneous breathing; SB+, airway pressure release ventilation with spontaneous breathing; ns, not significant; HU, Hounsfield unit.