Results: The average value of CVP was measured for the first time was 7.3 ± 3.0 CmH2O, after 30 minutes was 9.5 ± 2.6 CmH2O, after 60 minutes was 10.2 ± 2.3 CmH2O after 2 hours was 10.4 ± 2.3 CmH2O, after 3 hours was 10.5 ± 2.4 CmH2O, after 6 hours was 10.5 ± 2.5 CmH2O after 12 hours was 10.8 ± 2.5 CmH2O, after 24 hours was 12 ± 2.8 CmH2O, after 36 hours was 12.4 ± 4.1 CmH2O.