Digital Model For Electrocardiogram

Abstract

The electrophysiology of the heart is represented by a inear Time Invariant (LTI) system function to represent the electrocardiogram (ECG) in an efficient way. The ECG as well as its component waves, P, QRS and T, are independently subjected to Discrete Cosine Transform (DCT) and transform outputs are modelled using sixth order system for complete ECG and second order system for each component wave. When the complete ECG model is decomposed into three second order subsystems connected in parallel, denominator polynomials of these subsystems are closely matching with the denominator polynomials of three second order models derived for component waves. Sum of the component models impulse response is in good agreement with that of the ECG model. A relation between system parameters and the time domain signal peaks is presented. Validity of the method is discussed for the ECGs of bizarre shape and more than one ECG cycle in a sample frame is considered for modelling. The model provides a method to analyse and synthesise ECGs of different morphologies.