Fig. 2From: The value of arterial pressure waveform cardiac output measurements in the radial and femoral artery in major cardiac surgery patientsFour Quadrant plot. Four quadrant plots: The serial changes in cardiac output measured with the ProAQT® (∆COp) are plotted against the changes in cardiac output measured by thermodilution (∆COtd). The four quadrant concordance rate, defined as the percentage of the number of data points that fall into 1 of the 2 quadrants of agreement are shown with and without making use of an exclusion zone (0.75 L/min)Back to article page