Fig. 2From: Pleth variability index and respiratory system compliance to direct PEEP settings in mechanically ventilated patients, an exploratory studyChanges of PVI induced by different levels of PEEP (0, 5, 10 cmH2O). *Significant difference compared with group of PEEP at 0 cmH2O, P < 0.01 (0.0070). #Significant difference compared with group of PEEP at 5 cmH2O, P < 0.01 (0.0069)Back to article page