(Circulation. 1997;96:1525-1531.)
© 1997 American Heart Association, Inc.
Articles |
A Prospective Evaluation of Catheter Ablation of Ventricular Tachycardia as Adjuvant Therapy in Patients With Coronary Artery Disease and an Implantable Cardioverter-Defibrillator
From the Division of Cardiology, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor.
Correspondence to S. Adam Strickberger, MD, University of Michigan Medical Center, 1500 E Medical Center Dr, Box 0022, Ann Arbor, MI 48109-0022.
Background Implantable cardioverter-defibrillator (ICD) therapy is integral to current therapy for ventricular tachycardia. Patients with an ICD frequently require concomitant antiarrhythmic drug therapy. Despite this, some patients still receive frequent ICD therapies for ventricular tachycardia. Therefore, the purpose of this prospective study was to determine the utility of ablation of ventricular tachycardia in patients with an ICD who experience frequent ICD therapies.
Methods and Results Twenty-one consecutive patients with frequent ICD therapies despite antiarrhythmic drug therapy were the subjects of this study. The mean age was 69±6 years, and 17 were men. The mean ejection fraction was 0.22±0.08, and all patients had coronary artery disease. During the 36±51 days (range, 4 days to 7 months) preceding the ablation procedures, the patients received 34±55 ICD therapies for the clinical ventricular tachycardia, or a mean of 25±88 ICD therapies per month. The patients underwent radiofrequency ablation of the presumed clinical ventricular tachycardia by inducing the tachycardia and mapping according to endocardial activation, continuous electrical activity, pace mapping, concealed entrainment, or mid-diastolic potentials. Ablation of the clinical arrhythmia was successful in 76% of patients during 1.4±0.6 (range, 1 to 3) ablation procedures and required 12.5±9.2 applications of energy. During 11.8±10.0 months of follow-up, the frequency of ICD therapies per month decreased from 60±80 before successful ablation to 0.1±0.3 ICD therapies per month after ablation (P=.01). A quality-of-life assessment demonstrated a significant improvement after successful (P=.02) but not unsuccessful ablation (P=.9).
Conclusions Radiofrequency ablation of ventricular tachycardia as adjuvant therapy in patients with coronary artery disease and an ICD has a reasonable success rate, significantly reduces ICD therapies, and appears to be associated with an improved quality of life.
Key Words: implantable cardioverter-defibrillator • catheter ablation • coronary artery disease • tachycardia
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