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Dispersion of ventricular repolarization in dilated cardiomyopathy
1Division of Cardiology, Cliniques Universitaires Saint Luc, University of Louvain Medical School, Brussels, Belgium.
European Heart Journal
|July 1, 1997
Summary
Ventricular repolarization dispersion is elevated in dilated cardiomyopathy patients, particularly those with conduction defects. This suggests a higher risk for ventricular tachyarrhythmias in these individuals.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Electrophysiology
Background:
- Increased dispersion of ventricular repolarization is a known risk marker for ventricular tachyarrhythmias.
- This study investigates dispersion indices in various cardiac conditions.
Purpose of the Study:
- To compare four ventricular repolarization dispersion indices across four clinical groups.
- To assess dispersion in normal subjects, patients with intraventricular conduction defects, dilated cardiomyopathy, and combined conditions.
Main Methods:
- Analyzed a 10-second ECG recording from 15 leads.
- Computed four dispersion intervals (JTapex, JTend, QTapex, QTend) after interactive editing.
- Defined dispersion as the difference between maximal and minimal interval values across leads.
Main Results:
- All four dispersion indices were significantly lower in normal subjects compared to the other groups (P < 0.001).
- Patients with dilated cardiomyopathy and intraventricular conduction defects showed higher dispersion than those with dilated cardiomyopathy alone (P < 0.01).
- Higher dispersion values were observed in patients with both conditions compared to those with only conduction defects or only dilated cardiomyopathy.
Conclusions:
- Ventricular repolarization dispersion is significantly increased in dilated cardiomyopathy patients.
- The presence of intraventricular conduction defects further exacerbates this dispersion.
- Elevated dispersion in these patients indicates a heightened risk for potentially life-threatening arrhythmic events.