1 39.1 Introduction
The signal averaging technique is applied to electrocardiographic recordings to reduce extraneous noise, which masks low-amplitude bioelectric signals from the heart. Although modern amplifier design and good recording techniques can minimize certain types of noise, other sources of noise, such as muscle activity, obscure low amplitude potentials. With signal averaging, the noise level can be reduced so that repetitive waveforms at the microvolt level can be reliably detected and analyzed. The noise level after averaging is, in most studies, below 1 μV, the equivalent of 1/100 of a millimeter at a standard ECG display scale.
This chapter discusses the methodology of signal averaging and its use in studying high-frequency components of the QRST complex, manifested either as ventricular late potentials (Sects. 39.3 through 39.7) or within the QRS complex (Sects. 39.8 and 39.9). Signal averaging is useful also in other ECG applications such as exercise testing (see Chap. 36...
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Sörnmo, L., Johansson, E.T., Simson, M.B. (2010). The Signal-Averaged Electrocardiogram. In: Macfarlane, P.W., van Oosterom, A., Pahlm, O., Kligfield, P., Janse, M., Camm, J. (eds) Comprehensive Electrocardiology. Springer, London. https://doi.org/10.1007/978-1-84882-046-3_39
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