On the variability of QRS time-duration in magnetocardiographic recordings

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 magnetoca...

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Bibliographic Details
Published in:Journal of medical engineering & technology 2003-01, Vol.27 (3), p.113-117
Main Authors: Schless, BG, Müller, H-P, Pasquarelli, A, Erné, SN, Hombach, V
Format: Article
Language:English
Subjects:
Adult
Aged
Algorithms
Biological and medical sciences
Coronary Disease - diagnosis
Coronary Disease - physiopathology
Diagnosis, Computer-Assisted - methods
Electrocardiography - methods
Female
Heart Rate
Humans
Magnetics
Male
Medical sciences
Middle Aged
Models, Cardiovascular
Models, Statistical
Myocardial Infarction - diagnosis
Myocardial Infarction - physiopathology
Reproducibility of Results
Sensitivity and Specificity
Tachycardia, Ventricular - diagnosis
Tachycardia, Ventricular - physiopathology
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Summary: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.
ISSN:0309-1902
1464-522X
DOI:10.1080/0309190031000070007