On the variability of QRS time-duration in magnetocardiographic recordings |
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| Authors: | BG Schless H-P Müller A Pasquarelli SN Erné V Hombach |
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| Affiliation: | 1. Department of Cardiology, University of Ulm, D-89081 Ulm Germany;2. Division for Biosignals and Imaging Technologies, Central Institute for Biomedical Engineering, University of Ulm D-89069 Ulm, Germany |
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| Abstract: | High resolution electrocardiography (HRECG) recordings have already shown an increased beat-to-beat microvariability of the QRS duration of the terminal QRS in patients with a history of ventricular tachycardia (VT). The purpose of this study is to detect QRS-duration microvariability with magnetocardiographic (MCG) recordings in normals, patients with coronary heart disease (CHD), patients with a history of myocardial infarction (MI), and VT patients. QRS microvariability is calculated as the variance of time-shifts of single beats respectively to the average of all beats. The average over all channels of the MCG is performed. QRS microvariability was evaluated from 55-channel MCG in 15 normal persons, in 12 patients with CHD, in 13 patients with MI, and in 10 patients with VT. We found a significantly higher microvariability in patients with MI compared to normals. The highest microvariability was found in VT patients. |
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