METHOD AND HARDWARE-SOFTWARE MEANS OF BIOIMPEDANCE ANALYSIS FOR MOBILE ECG MONITORING SYSTEM
Subject and goals. This study is devoted to solving one of the important problems of ECG monitoring in free movement conditions related to the distortion of the signal form under the influence of changes in bioimpedance. Methods. For analysis of ECG form distortion caused by the bioimpedance of the tissues and organs of the body that are located between the heart and the electrodes of the ECG device the model is designed in a form of equivalent electric circuit. The method of decreasing the influence of bioimpedance on the ECG form based on this equivalent circuit is proposed. It includes application of a reconstruction filter, measurement of the parameters of the bioimpedance parasitic electric filter, and estimation of the transfer characteristics of the correction digital filter. Results and conclusions. The results of hardware and software development for correction of the ECG form are presented. A portable ECG device with a bioimpedance measurement channel between the electrodes is described. Software provides processing and representation of the ECG on the mobile device. The simulation results of the correction procedure of the ECG form are presented. The results show that the proposed method can be used in modern portable heart monitoring systems for decreasing the influence of bioimpedance on the ECG form.