Abstract
Electrical events of the heart can be detected by the conventional surface ECG, however, only depolarization and recovery of the atria and ventricles and the atrio-ventricular conduction delay (P-Q interval) are reflected by the corresponding signals, the P wave and the QRS complex. The activity of the sinus node itself and the His-Purkinje system is buried within the baseline noise because on the body surface their amplitudes are only in the microvolt range. Prolongation of intraventricular conduction of larger myocardial areas can be discovered by the typical hemiblock or bundle branch block patterns of ventricular de- and repolarization, whereas delayed activation of smaller areas of ventricular myocardium, e.g. in the neighborhood of an infarcted area or in right ventricular dysplasia, will be invisible within the conventional surface ECG due to the small amplitude (microvolt level) of the signals of interest1.
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Hombach, V., Höher, M., Kochs, M., Eggeling, T., Weismüller, P., Wiecha, J. (1993). Clinical significance of high resolution electrocardiography — sinus node, His bundle and ventricular late potentials. In: Gomes, J.A. (eds) Signal Averaged Electrocardiography. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0894-2_15
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DOI: https://doi.org/10.1007/978-94-011-0894-2_15
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