S. Jurko and G. Rozinaj (Slovak Republic)
Polynomial approximation, His-bundle and the low-level signals
Efforts to record an evidence of the electrical activity of the human body surface originating in the His-bundle or bundle branches have been reported since 1973. The usual methods processing of the low-level signals of the ECG have been based on averaging techniques as temporal averaging and space averaging by recording system. For the immediate diagnostic, therapeutic and prognostic application, recording on an every – beat basis is highly desirable. This is especially important for instance of changing atrioventricular conduction or arrhythmias. The paper introduces mathematical and graphical resources for the high resolution of the low-level signals of the ECG as the activity of the His bundle. The method based on polynomial approximation is suitable for processing of the low-level signals of the electrical activity of the heart often less than 10µV. The main goal is to verify the smoothing method by polynomial approximation if the SNR is negative (i.e. a signal is lower than noise).
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