Figure 1.
Variations of peak pressure, mean pressure and static compliance during the two hours of ventilation. H0: On connection of the ventilator, H0’: after recruitment maneuver, H1: after one hour of ventilation, H2: after 2 hours of ventilation. a, b and c denote a p value (Mann-Withney pairwise comparisons after Kruskal-Wallis test) <0.05 for the following pairwise comparisons: for VC vs OVTiw, VC vs OVTaw and OVTaw vs OVTiw, respectively. *Denotes p value (Mann-Withney pairwise comparison) <0.05 between H2 and H0’ in each group (n = 19–25 per group).