An ECG monitoring system analyzes ECG signals of leads associated with different anatomical locations of the body for evidence of ST elevation in the lead signals. The ST elevation and depression measurements of the leads are plotted in a graphical display organized in relation to the anatomical points which are the sources of the lead signals. In a polar graphical display format each lead signal is plotted on its own anatomically-oriented axis to prevent conflict between multiple lead signals. In a linear or rectilinear graphical display format each lead signal is plotted on its own row or column of the display. Missing lead signal values are filled in with averaged or interpolated values from other leads. Fig.20a
