The purpose of this study is to determine the measuring accuracy of the truly non-invasive
method estimated continuous cardiac output (esCCO) against the reference method pulse contour
analysis of the arterial waveform (Picco) in partial liver resection. esCCO is calculated
using the pulse wave transit time, which is defined as the time between the R-wave of the ECG
and a 30% increase of the differentiated pulseoximetry waveform.