Figure 1
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1756-0500-7-738/MediaObjects/13104_2014_Article_3268_Fig1_HTML.jpg)
The figure shows A: Mean arterial pressure (MAP), B: Mean pulmonary arterial pressure (MPAP), C: Pulmonary capillary wedge pressure (PCWP), D: Right atrium central venous pressure (CVP RA ), E: Femoral vein central venous pressure (CVP FV ) and F: Intra-abdominal pressure (IAP) in the ●: Intervention group (P-group) and the ○: Control-group (C-group) **: P < 0.01 ***: P < 0.001 within group difference compared with baseline values; # : P < 0.05 ##:P < 0.01 ###: P < 0.001 between group difference, same time.