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

<table>Variation of the ST segment according to the filter used. Lead V2<i>. </i>In the upper part no ST variations were observed in changing the low-pass filters (40, 100, or 150 Hz). The variations in the ST segment were only produced in the manual recording mode with high-pass filters of 0.5 Hz, regardless of the low-pass filter used (intermediate zone). In auto mode (lower part), no changes in the ST segment were produced. Auto and manual mode (see Figure <a href="../fig3/">3</a>).</table>

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Figure 5: High-Bandpass Filters in Electrocardiography: Source of Error in the Interpretation of the ST Segment 