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Increased QTc dispersion predicts lethal ventricular arrhythmias complicating coronary angioplasty
T Ashikaga1, M Nishizaki, M Arita
1Department of Cardiology, Yokohama Minami Kyosai Hospital, Japan.
The American Journal of Cardiology
|October 7, 1998
Insights
Increased QT dispersion before angioplasty predicts lethal ventricular arrhythmias. Successful revascularization reduced this dispersion, indicating a link to myocardial ischemia.
Area of Science:
- Cardiology
- Electrophysiology
- Interventional Cardiology
Background:
- QT dispersion is a measure of repolarization heterogeneity.
- Ventricular arrhythmias pose a significant risk during percutaneous coronary interventions.
Purpose of the Study:
- To evaluate QT dispersion as a predictor of lethal ventricular arrhythmias during angioplasty.
- To investigate the relationship between QT dispersion and myocardial ischemia.
Main Methods:
- QT dispersion was measured before and after angioplasty.
- Correlation with the occurrence of lethal ventricular arrhythmias was assessed.
Main Results:
- Elevated QT dispersion pre-angioplasty was a significant predictor of lethal ventricular arrhythmias.
- Successful coronary revascularization led to a decrease in QT dispersion.
Conclusions:
- QT dispersion is a valuable marker for predicting adverse arrhythmic events during angioplasty.
- Myocardial ischemia contributes to increased QT dispersion, which is reversible with successful revascularization.
Abstract:
This study found that increased QT dispersion just before angioplasty is an useful marker to predict the risk for lethal ventricular arrhythmias during angioplasty. The fact that successful coronary revascularization decreased QT dispersion suggested that a part of increased QT dispersion is related to myocardial ischemia.