Figure 2
Comparison of cardiac output measurements. Panel a) Correlation between measurements of cardiac output (CO) with the VolumeView™/EV1000™ system and reanalysis with the PiCCO2™ system. Panel b) Bland Altman Plot, with the difference between the values derived from the two algorithms plotted against their mean. The solid line represents bias, the two dashed lines the upper and lower limit of agreement. Panel c) Concordance plot of percentage change. Data points within the 10% exclusion zone are grayed out. Panel d) Polar plot with distance from the center as mean change and θ, the angle with the horizontal axis, as agreement. The dashed tram line intersects the 90° axis at ± 10% and marks the limit of acceptable concordance. The dotted lines mark the radial limits of agreement.