MAPPING OF PHASE RESPONSE PROPERTIES OF MONOPOLAR ECG VOLTAGES

In the present investigation an attempt has been made to study the pha se response properties of monopolar chest lead ECG voltages. Using a g enerator model of the heart an equivalent circuit of ECG network has b een developed. The equivalent impedance between WCT and probe electrod e has been determined by reduction techniques, From this equivalent im pedance the phasor characteristics of monopolar ECG voltages have been analysed for change in probe electrode locations. The source of the g enerated voltage, i.e., the heart, will develop a different voltage fo r its different condition, There will also be a change in impedances, Thus for the normal subject the distribution of the phasor of the ECG voltages will be different from that of the abnormal one, A software t ool has been developed to evaluate the relative phase response of ECG voltages. The data acquisition of monopolar ECG records of chest leads V1 to V6 from chart recorder has been done with the help of AutoCAD a pplication package. The harmonic constituents of ECG voltages have bee n evaluated at each harmonic plane and the phase characteristics have been studied in polar coordinate for normal subjects as well as for a typical case. An interesting result has been observed in typical cases which are indicated in the paper.