2 research outputs found
High-Bandpass Filters in Electrocardiography: Source of Error in the Interpretation of the ST Segment
Introduction. Artifactual variations in the ST segment may lead to confusion with acute coronary syndromes. Objective. To evaluate
how the technical characteristics of the recording mode may distort the ST segment. Material and Method. We made a series of
electrocardiograms using different filter configurations in 45 asymptomatic patients. A spectral analysis of the electrocardiograms
was made by discrete Fourier transforms, and an accurate recomposition of the ECG signal was obtained from the addition of
successive harmonics. Digital high-pass filters of 0.05 and 0.5 Hz were used, and the resulting shapes were compared with the
originals. Results. In 42 patients (93%) clinically significant alterations in ST segment level were detected. These changes were only
seen in “real time mode” with high-pass filter of 0.5 Hz. Conclusions. Interpretation of the ST segment in “real time mode” should
only be carried out using high-pass filters of 0.05 Hz.Buendıa Fuentes, F.; Arnau Vives, M.; Arnau Vives, A.; Jiménez Jiménez, Y.; Rueda-Soriano, J.; Zorio-Grima, E..; Osa-Saez, A.... (2012). High-Bandpass Filters in Electrocardiography: Source of Error in the Interpretation of the ST Segment. ISRN Cardiology. 2012:706217-706227. doi:10.5402/2012/706217S706217706227201