Accuracy, Precision, and Trending Ability of Electrical Cardiometry Cardiac Index versus Continuous Pulmonary Artery Thermodilution Method: A Prospective, Observational Study

Figure 3

Four-quadrant plot analysis. Assessment of trending ability for pooled data. In the four-quadrant plot, the change in CI Vigilance™ (-axis) is plotted against the change in CI Aesculon (-axis). Ideally, all data points lie along the line of identity “  1/4  ” (dotted line). The central square refers to the 15% exclusion zone. The zero axes “  1/4  0” and “  1/4  0” cross in the centre of the plot, creating four quadrants. In the right upper and left lower quadrants, CI Aesculon and CI Vigilance agree, which means that CI Aesculon and CI Vigilance change in the same direction. The concordance refers to the percentage of data points in these quadrants.