Analysis of low-amplitude signals of cardiac electrical activity

Identification and Assessment of Electrocardiographic Markers of Cardiac Electrical Instability

“…For the analysis of low-amplitude components of electrocardiosignals a combined approach, which includes several stages with the use of methods of analysis of the I-st and the II-nd classes, is encouraged to use: wavelet transformation, decomposition in the basis of eigenvectors, principal component analysis [10][11][12][13]. For tasks of processing of low-amplitude components of ECG the different combinations of these methods can be utilized [3,4,[9][10][11][12][13]. where N is the amount of samples.…”

“…Noninvasive registration from the body surface, identification and analysis of late potentials are the challenging tasks due to the fact that amplitude of late potentials may be much smaller than the amplitude of the noise components of ECG [1][2][3][4]. Noise and interferences occurring in the ECG signal have the different nature and include: power line interference; polarization of the electrodes, resulting in a shift of the zero signal level; artifacts of electrodes displacement; motion artifacts; muscular activity; baseline drift caused by breathing; noise of electronic equipment.…”

“…Development of the non-invasive methods for detection of the early signs of heart disease will enable diagnosis of the disease at early stage of its development. Digital processing of electrocardiographic signals makes it possible to extract information, which cannot be obtained by the visual analysis of the standard electrocardiogram [3,4].…”

“…Among the systems that allow investigation of subtle manifestations of cardiac electrical activity, the systems of high resolution electrocardiography (HR ECG) should be noted [1][2][3]. Early diagnosis of the state of the cardiovascular system developed on the basis of HR ECG methods has essentially new opportunities and begins to be widely applied in clinical practice.…”

“…Apart from myocardial imaging techniques (magnetic resonance imaging, computed tomography, tissue Doppler), such electrocardiographic parameters as alternation of T wave and HR ECG with detection of atrial and ventricular late potentials can serve as the prognostic markers for the selection of patients for implantation of cardiovertersdefibrillators [1,3].…”