Figure 2
Regional τ 1 ( top ) and τ 2 ( bottom ) determined by EIT in the ventral and dorsal lung areas in 12 patients with normal lungs ( left ) and 20 patients with ARDS ( right ) during step increase in airway pressure from 0, 8 and 15 cm H 2 O to the final pressure of 35 cm H 2 O. Significant differences between and within the groups are indicated: normal lung versus ARDS *, p < 0.05, **, p < 0.001; ventral versus dorsal lung area §, p < 0.05, §§, p < 0.001; significant effect of positive end-expiratory pressure (PEEP), s., p < 0.05.