High-Bandpass Filters in Electrocardiography: Source of Error in the Interpretation of the ST Segment

<table>Application of a high-pass filter with a cut-off frequency of 0.5 Hz using the MATLAB 5.0 program applied to the digitized ECG signal. The recomposition of the ECG by means of the sum of the successive harmonics (5, 10, 30, and 169), obtained from the application of this filter, are shown. An elevation of the ST segment may be seen, which is already evident after summing the first 10 harmonics (image at upper right).</table>

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Figure 10: High-Bandpass Filters in Electrocardiography: Source of Error in the Interpretation of the ST Segment 