Time domain analysis of the signal averaged electrocardiogram in patients with a conduction defect or a bundle branch block

Doubts have been expressed about the clinical usefulness of time domain analysis of the signal averaged electrocardiogram in patients with prolonged QRS complex duration. We studied 147 patients using a signal averaged ECG (40–250 Hz) whose QRS complex was longer than 100 ms. A baseline electrophysi...

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Bibliographic Details
Published in:European heart journal 1995-12, Vol.16 (12), p.1912-1919
Main Authors: GATZOULIS, K. A., CARLSON, M. D., BIBLO, L. A., RIZOS, I., GIALFOS, J., TOUTOUZAS, P., WALDO, A. L.
Format: Article
Language:English
Subjects:
Adult
Aged
Biological and medical sciences
bundle branch block
Bundle-Branch Block - diagnosis
Bundle-Branch Block - physiopathology
Cardiac dysrhythmias
Cardiac Pacing, Artificial
Cardiology. Vascular system
Coronary Disease - diagnosis
Coronary Disease - physiopathology
Electrocardiography - instrumentation
Female
Fourier Analysis
Heart
Heart Conduction System - physiopathology
Humans
intraventricular conduction defect
Long QT Syndrome - diagnosis
Long QT Syndrome - physiopathology
Male
Medical sciences
Microcomputers
Middle Aged
Sensitivity and Specificity
Signal averaged electrocardiogram
Signal Processing, Computer-Assisted - instrumentation
Tachycardia, Ventricular - diagnosis
Tachycardia, Ventricular - physiopathology
Time Factors
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Summary:Doubts have been expressed about the clinical usefulness of time domain analysis of the signal averaged electrocardiogram in patients with prolonged QRS complex duration. We studied 147 patients using a signal averaged ECG (40–250 Hz) whose QRS complex was longer than 100 ms. A baseline electrophysiology study was also performed in 128 of these patients. Seventy-seven patients had a minor (QRS 100 ms) conduction defect. Thirty-seven of these 77 had either induced or spontaneous sustained ventricular tachycardia (group I) and 40 had no sustained ventricular tachycardia (group II). Seventy patients had a major (QRS≤120 and >100 ms) conduction defect, 44 of whom had sustained ventricular tachycardia (group A). The remaining 26 without this condition formed Group B. Group I compared to group II patients had a longer filtered QRS duration (120.8 ± 14 vs 104.5 ± 9.5 ms, P
ISSN:0195-668X
1522-9645
DOI:10.1093/oxfordjournals.eurheartj.a060847