Circulation Journal
Online ISSN : 1347-4820
Print ISSN : 1346-9843
ISSN-L : 1346-9843
Clinical Investigation
Electrocardiography Subtraction Method of Detecting Low-Amplitude, High-Frequency Components (L-HFCs) Within the QRS Complex of Patients With Ventricular Tachycardia
Toshihiko NankeKiyoshi NakazawaMariko AraiShounosuke RyuTsuneharu SakuraiNaoki MatsumotoChuichi SatoFumihiko Miyake
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2002 Volume 66 Issue 7 Pages 649-654

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Abstract

A new method of extracting the low-amplitude and high-frequency components (L-HFCs) was developed and this study investigated its usefulness in 86 subjects: 28 normal subjects (group 1) and 58 patients with a previous myocardial infarction (MI). The patients were classified into 3 groups: group 2 with 38 patients without ventricular tachycardia (VT), group 3 with 13 patients with non-sustained VT, and group 4 with 7 patients with sustained VT. The new electrocardiography (ECG) subtraction method, using a mathematical filtering procedure, was used instead of conventional complex filtering. The continuous L-HFCs within the QRS complex were analyzed using a Z-lead recording. The duration of the continuous L-HFCs was significantly longer in group 4 than in groups 1 (p<0.0001), 2 (p<0.0001) or 3 (p<0.05) with all 3 filters. The ECG subtraction method is a powerful and useful new technique for identifying patients at risk for either sustained or non-sustained VT after MI, and overcomes several of the problems with the conventional signal-averaging method. (Circ J 2002; 66: 649 - 654)

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© 2002 THE JAPANESE CIRCULATION SOCIETY
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