Visualizing the electrocardiogram through orbital transform

The purpose of this work is to present a new electrocardiogram (ECG) visualization technique through a mathematical transform applied to one lead ECG signal. This transform, called orbital transform (OT) in this work, consists of a remapping of the ECG signal to a spatial curve represented by a three dimensional phase portrait. With this spatial curve it is possible to observe the evolution of changes in the QRS complex, which are not always clear to distinguish by a simple visual inspection of the temporal ECG signal. Moreover, using the projection of this curve in one of the 2D planes it is possible to easily calculate variation ranges of several ECG parameters such as maximal and minimal waves amplitudes and maximal and minimal wave slopes.