Fig. 3From: Pleth variability index and respiratory system compliance to direct PEEP settings in mechanically ventilated patients, an exploratory studyChanges of CVP induced by different levels of PEEP (0, 5, 10 cmH2O). **Significant difference compared with group of PEEP at 0 cmH2O, P < 0.01 (0.0004)Back to article page