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

Francisco Buendía Fuentes | Zendy; Miguel-Ángel Arnau-Vives | Zendy; A. Arnau-Vives | Zendy; Y. Jiménez-Jiménez | Zendy; Joaquín Rueda-Soriano | Zendy; Esther Zorio | Zendy; Ana M. Osa Sáez | Zendy; Luis MartínezDolz | Zendy; Luis AlmenarBonet | Zendy; Miguel A. Palencia-Pérez | Zendy

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

Author(s) -

Francisco Buendía Fuentes,

Miguel-Ángel Arnau-Vives,

A. Arnau-Vives,

Y. Jiménez-Jiménez,

Joaquín Rueda-Soriano,

Esther Zorio,

Ana M. Osa Sáez,

Luis MartínezDolz,

Luis AlmenarBonet,

Miguel A. Palencia-Pérez

Publication year - 2012

Publication title -

isrn cardiology

Language(s) - English

Resource type - Journals

eISSN - 2090-5599

pISSN - 2090-5580

DOI - 10.5402/2012/706217

Subject(s) - band pass filter , harmonics , st segment , confusion , asymptomatic , electrocardiography , signal (programming language) , high pass filter , filter (signal processing) , low pass filter , medicine , cardiology , mathematics , computer science , physics , myocardial infarction , optics , computer vision , psychology , quantum mechanics , voltage , psychoanalysis , programming language

. 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.

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